巻号一覧
33 巻, 1 号
選択された号の論文の26件中1～26を表示しています
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孫 鳳根, 井原 精一, 三宅 正宣, 佐野 忠雄1969 年 33 巻 1 号 p. 1-3
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe diffusion coefficients of carbon in vanadium have been studied by a tracer technique using C14 over the temperature range from 845° to 1130°C. The diffusion coefficients are described by an equation, D=D0exp(−E⁄RT) (cm2/sec) where D0 and E are 0.0049 cm2/sec and 27.3 kcal/mol, respectively. These values coincide very well with those obtained by Powers et al. using the elastic after effect.抄録全体を表示PDF形式でダウンロード (370K) -
田中 英八郎, 福田 武司, 新林 孝文, 鈴木 善彦, 二瓶 義雄1969 年 33 巻 1 号 p. 4-9
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIt is considered that the curling of a cold-rolled thin strip is caused by an asymmetrical distribution of residual stress, but few studies have so far been made about it. This work has been carried out to study its origin by means of roll indentation tests and residual stress measurements. The results are summarized as follows:
(1) An identical relation was obtained between a rolling draught and a depth of roll indentation for every pass, and it was proved theoretically. Using this relation, the draught on the top or the bottom side of a strip could be known quantitatively from the indentation test.
(2) The longitudinal residual stress pattern over the thickness of every strip was approximated as a quadratic function.
(3) In case the diameter of the top roll was different from the bottom one, an asymmetrical residual stress distribution was introduced by the difference in draughts on the top and bottom sides.
(4) When rolled with inclined pass lines, asymmetrical residual stress patterns seemed to be caused by the difference in contact arc length between the top and bottom sides.
(5) The larger the front tention, the smaller became the curling curvature radius.抄録全体を表示PDF形式でダウンロード (1436K) -
田中 英八郎, 池田 圭介, 福田 次男, 徳能 裕巳1969 年 33 巻 1 号 p. 10-15
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe coefficient of friction at a tool-work piece interface in cold metal working has a value of the order of 0.01. It is known that this comparatively low friction coefficient is due to the hydrostatic effect of lubricant trapped in microscopic surface pockets of a work piece. However, little attention has been given to the mechanism by which these oil-pools are formed. The present work was carried out to study the details of surface oil-pool development during cold-rolling using single and coarse-grained polycrystalline aluminium as specimens. In plane strain deformation such as rolling, they do not appear as circular pockets but as grooves nearly at a right angle to the flow direction. The mechanism of their formation consisted of two types; One was named A-type, which resulted from cross slip or pencil gride on same {111} planes, and the other, B-type, which resulted from slip with operation in only one {111} plane of which slip traces were nearly parallel to the transverse direction on the rolled surface. Microscopic surface oil-pools on the polycrystals were also formed in the same manner as the single crystals. They were formed not only by slip but also by the deformation band.抄録全体を表示PDF形式でダウンロード (1760K) -
鰐部 吉基, 佐野 幸吉1969 年 33 巻 1 号 p. 16-21
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーA hole was first bored in a solid iron containing oxygen and filled with a pure aluminum wire, and then held at 1450°C for half an hour to three hours. The formation of aluminum inclusions in solid iron was investigated with the naked eye and by means of the microscope and by the microanalyzer. The results are:
(1) The inclusions formed were much smaller than those formed during the deoxidation of liquid iron with aluminum.
(2) The stratiform inclusions group was formed near the boundary between solid iron and liquid aluminum namely at the solid-liquid interface.
(3) The stratiform inclusions group consisted of alumina, spinel hercynite and wüstite, singly or in various combinations.
(4) The distribution of the inclusions forming the stratiform group could be successfully explained by assuming that the behavior for the solubility of oxygen in solids was the same as in liquids.抄録全体を表示PDF形式でダウンロード (863K) -
鰐部 吉基, 佐野 幸吉1969 年 33 巻 1 号 p. 22-27
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーSufficiently pure aluminum was put onto solid iron with a wide variety of controlled oxygen content, in order to investigate the effect of oxygen on the formation of the inclusions as well as the behavior of the formation of the inclusions in the case of sufficient supply of aluminum, and to measure the displacement of the solid-liquid interface which is closely related to such a reaction. The results were obtained with the naked eye, and by the microscope and the microanalyzer, and coordinated with the effects of the initial oxygen content and the reaction time. The results are:
(1) There were three distinguishable regions in the specimens; region (I) in the rang of more than about 50% aluminum, region (II) in the range of 20% and 50% aluminum, and region (III) in the range of nearly 0% aluminum.
(2) The thickness of region (II) increased with increases in reaction time, but decreased with increasing initial oxygen content.
(3) The stratiform inclusions group was formed near the boundary between regions (II) and (III), namely at the solid-liquid interface.
(4) Increasing both the initial oxygen content in solid iron and the reaction time caused the formed inclusions to grow excellently and increase in density.
(5) The displacement of the solid-liquid interface increased with increases in reaction time, but decreased with increasing initial oxygen content.
(6) An empirical linear law was held good to the displacement of the interface between regions (I) and (II), in which case there was no effect of the initial oxygen content. A parabolic law was held to the displacement of the solid-liquid interface, in which case there was the effect of the oxygen content.
(7) The diffusion of aluminum into iron was successfully analyzed by using the diffusion equations with a precipitation as discussed by Hermans and others.
(8) The aluminum content in the matrix which was corrected by using Philibert’s equation is in good agreement with that estimated from the relative intensity of iron. But Banks’ correction has some deviation from the actual data.抄録全体を表示PDF形式でダウンロード (1211K) -
藤田 英一, 井口 征夫1969 年 33 巻 1 号 p. 28-33
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe interaction energy between the interstitial solute and solvent atoms and the entropy change due to solution in the interstitial alloys were theoretically treated. By using the actual solubility curves in various constitutions, it was possible to calculate the internal energy and the entropy changes for almost all combinations between hydrogen, carbon, nitrogen, oxygen, and the transition metals. The caluculated values were found to vary systematically in the periodic table. To interpret the general tendency, the strain energy around the interstitial atoms, and the change of electronic states, such as the formation of covalent bonding were taken into considerations. Especially, they were closely related with the crystal structure and the state of incompleted shells of the transition elements. Furthermore, the solubility limit of oxygen in α-iron was estimated by interpolating the calculated values of the internal energy and entropy changes for the interstitial alloys between oxygen and other transition metals. The result suggested that 2∼12 ppm oxygen would be soluble in α-iron at 1000°K.抄録全体を表示PDF形式でダウンロード (1507K) -
大島 隆一郎, 藤田 英一1969 年 33 巻 1 号 p. 34-39
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーSub-boundaries in Al single crystals grown from the melt under various conditions were studied by means of X-ray Laue diffraction, pseudo-Kossel lines, transmission electron microscopy and selected area electron diffraction.
The results obtained are as follows:
(1) Besides sub-boundaries comprised of a regular array of dislocations or dislocation networks, a new type of sub-boundaries composed of fine tangling dislocation segments was frequently observed.
(2) The new type sub-boundaries lay in the {311} or {211} planes.
(3) Relations between the structure of the sub-boundaries and the misfit angle across the boundaries, the growth rate and the purity of the crystals were examined.
(4) Experiments to determine the Burgers vectors of the tangling dislocation segments suggested that strains around them may be described by assuming a certain vector which is the vector sum of the Burgers vectors of the segments.
(5) The interactions of edge dislocations arising from collapsed vacancy disks, screw dislocations which are moving actively in the crystal after the solidification, and impurities seem to strongly influence the formation of the sub-boundaries, leading to the appearance of a complicated structure of the sub-boundaries.抄録全体を表示PDF形式でダウンロード (1190K) -
深瀬 幸重, 遅沢 浩一郎, 根本 力男1969 年 33 巻 1 号 p. 40-46
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーFifteen 20Cr/30Ni/Fe alloys containing 0.1∼2.5%Si and 0.1∼2%Mn with or without additions of rare earth were oxidized at 1200°C in air under cyclic and continuous heating conditions. The surface layer of oxidized alloys have been investigated by metallography, X-ray diffraction, chemical analysis and electron-probe microanalysis.
The oxidation life of these alloys is markedly improved by additions of rare earth elements. The oxidation life of the alloy containing no rare earth is little affected by the variation of Si and Mn content. A favourable effect of Si and detrimental effect of Mn are observed only when rare earth is added to the alloy. The surface scale formed on the alloy containing no rare earth consists of irregular multiple layers of Cr2O3 and spinel oxide, whereas the scale on rare earth-containing alloy consists of a single layer of uniform mixture of these oxides. The latter scale is more protective.抄録全体を表示PDF形式でダウンロード (1207K) -
深瀬 幸重, 遅沢 浩一郎, 根本 力男1969 年 33 巻 1 号 p. 46-52
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリー20Cr/30Ni/Fe alloys with various amounts of Si, Mn and rare earth elements were oxidized for twenty hours at 1200°C in air. The tenacity of the surface scale was estimated and the internal oxidation was investigated by means of the electron-probe microanalyzer.
The internal oxide, SiO2, of the alloy without rare earth is formed irregularly and at random, while on the rare earth-containing alloy it is formed uniformly at the scale/matrix interface and extends into the grain boundaries of matrix. Mn lowers the tenacity of surface oxide scale to the matrix, but the influence of Si is different if the rare earth is present; the tenacity of the surface scale of rare earth-containing alloy increases, while that of the alloy containing no rare earth decreases, with increasing Si content. The tenacity of the scale is dependent on the mode of internal oxidation of Si. It is concluded, as reported in our earlier paper on 80Ni/20Cr alloys, that rare earth addition improves the oxidation resistance through indirect effects, i.e. by accelerating internal oxidation of Si and by making the surface chromium oxide more protective and tenacious.抄録全体を表示PDF形式でダウンロード (1489K) -
竹内 栄, 三沢 正勝1969 年 33 巻 1 号 p. 53-59
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーChanges in electrical resistivity Δρ were measured for some liquid metals of low melting point, such as, In, Sn and Bi, when 1 at% of metallic elements of the same period in the periodic table with the above solvent were alloyed, respectively. A somewhat regular relation is found for the dependence of Δρ upon ΔZ, the valence difference between solvent and solute atoms, and it is a different type from the Linde’s law with a validity in the solid.
Theoretical estimation for Δρ is performed from the standpoint that the electrical resistivity of dilute liquid alloy is determined mainly by the scattering of conduction electrons from a liquid composed of atoms having the mean scattering potential and the one produced by the fluctuation from the mean potential for solvent and solute atoms. The calculation is in agreement with the experimental values of Δρ. The dependence of Δρ upon ΔZ is discussed from the pseudo-potentials of solute and solvent in dilute alloys and the shape of correlation function a(K) of solvent metals.
The resistivity change due to the fluctuation of potentials is found to be roughly proportional to (ΔZ)2.抄録全体を表示PDF形式でダウンロード (2312K) -
雄谷 重夫, 神尾 彰彦1969 年 33 巻 1 号 p. 60-66
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーPrinciples of monotectic solidification of the binary copper-lead alloy are introduced from the observation of crystallizing courses of direction-free and unidirectional solidification in the monotectic and hyper-monotectic alloys. In the direction-free solidification the α-solid of a monotectic product grows in volume spherically unlike dendritic growth in the hypo-monotectic alloy. The released L2 liquid accompanied by generation of the α-solid lies in the α-solid sphere radiately, while the initial L2 does in the boundaries. Columnar growth of the α-solid of a monotectic product occurs in an opposite direction of heat flow during unidirectional solidification. The monotectic cell is produced in which the α-solid of a monotectic product grows in an opposite direction of heat flow surrounding the released rod-like L2 liquid. In the unidirectional solidification at temperature gradient 50°C/cm and freezing rate 60 mm/min abnormal condensation of the L2 in the liquid in advance of the monotectic cell results in the bell-shape aggregation in the hyper-monotectic copper-50% lead alloy. At temperature gradient 10° to 30°C/cm and freezing rate 0.5 to 4.0 mm/min widening the (L1+L2) layer causes arrangement of coarse and rod-like L2 liquid within the monotectic cell. The inter-rod spacing is in inverse proportion to the square root of freezing rate and is reduced with temperature gradient in the liquid. Both copper and lead in the monotectic cell grow preferentially in the ⟨110⟩ direction at high rate of freezing and in ⟨111⟩ at slow rate.抄録全体を表示PDF形式でダウンロード (3230K) -
金武 典夫, 津村 利光, 斎藤 進六, 宇佐美 亘1969 年 33 巻 1 号 p. 66-70
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーChanges in the mechanical properties of heat-treated steel by hydrostatic pressure have not fully been made clear. In this report, according to the “hydrostatic pressure treatment” in which contraction is first given by hydrostatic pressure and then restored to normal pressure, the hardened Cr-Mo steel, 0.41%C, 0.97%Cr, and 0.28%Mo was tempered at 150°∼450°C, and then given a hydrostatic pressure treatment of 2000∼6000 kg/cm2 to examine the change of mechanical properties of steel. The results obtained are as follows:
(1) The surface hardness of the steel is increased by the hydrostatic presssure treatment, when the hardened steel is tempered at less than approx. 350°C. When tempered at 400°∼450°C, however, its effect is not found.
(2) The tension strength of the flat material is affected by the hydrostatic pressure treatment, when tempered at less than 200°C. But, by tempering at 200°∼400°C, no effect is observed.
(3) The tension strength of the notched material is more easily affected by the hydrostatic pressure treatment than that of the flat material. When the hardened steel is tempered at less than 200°C, the tension strength increases by the hydrostatic pressure treatment. When tempered at less than 250°C, it increases and decreases. By tempering at 300°∼350°C, it decreases slightly. When tempered at 400°C, no effect is observed.
(4) The behavior of the residual strain of the notch flute bottom caused by the hydrostatic pressure treatment has been investigated.
(5) The effect of the hydrostatic pressure treatment upon the Charpy impact value agrees well with the behavior of tension strength of notched material.
(6) Within the limits of 1∼20 min, the effect of the hydrostatic pressure treatment time upon the mechanical properties is constant.抄録全体を表示PDF形式でダウンロード (1003K) -
椙山 正孝, 福迫 達一, 佐藤 彰1969 年 33 巻 1 号 p. 71-76
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーRegarding the process of direct-rolling of molten metals as an extended one of the continuous casting, a study was made of the production of half-made products by the direct-rolling method using Al-Mn alloys which have a very narrow solidification range, the direct-rolling conditions and properties of the direct-rolled plates were examined. The main results obtained were as follows:
(1) The small difference in Mn content of alloys have a considerable effect on the direct-rollable speed.
(2) At the lower direct-rolling speed Mn distribution was very uniform, and in 3%Mn alloy the metallic compound Al6Mn was very fine and distributed very uniformly.
(3) The tensile strength and the elongation of direct-rolled plates became greater as the direct-rolling speed became slower.
(4) At the lower direct-rolling speed surface conditions of direct-rolled plates were very good.抄録全体を表示PDF形式でダウンロード (1527K) -
柳ヶ瀬 勉, 杉之原 幸夫, 中村 清徳1969 年 33 巻 1 号 p. 76-82
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーVery few studies by thermal differential analysis (DTA) have been reported on the mechanism in gas reduction of iron oxide. In this experiment, the change in reduction on DTA curves obtained at a constant heating rate or constant temperature was examined by a specially designed apparatus which makes possible the reducing gas to flow between oxide particles. The results indicate that Africa hematite tends to be reduced to α-Fe through magnetite and wüstiteand is faster in the time needed for reduction than Texada magnetite. It was also found that di-calcium ferrite was once formed before mono-or hemicalcium ferrite was reduced to α-Fe and CaO. The activation energy for hydrogen gas reduction of wüstite was determined to be about 14 kcal/mol, by observing the shift of the peak on the DTA curves due to the change of the heating rate.抄録全体を表示PDF形式でダウンロード (1723K) -
鈴木 寿, 山本 孝春, 川勝 一郎1969 年 33 巻 1 号 p. 82-88
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe mechanisms of cratering formed on the WC-Co base carbide tools were mainly investigated in relation to the carbon contents of both cemented carbides and machined steels. High carbon and low carbon cemented carbide bits, the composition of which were WC-10%Co, WC-10%TaC-10%Co and WC-10%TiC-10%Co, were vacuum-sintered at 1375°C for 1.5 hr. Using these bits of the throw away type, various carbon steels, i.e., SK 3 (1.1%C), SK 7 (0.6%C) and S 10 C (0.1%C) and 18-8 type stainless steel of SUS 27 were machined.
Main results obtained were as follows:
(1) In WC-Co alloys, the cratering due to the formation of M6C type carbide was found to easily develope during cutting of low carbon steels or stainless steel, especially in the case of low carbon cemented carbide bits. This phenomenon was based on the diffusing-out of carbon from cemented carbides during cutting of the steels.
(2) In alloys containing, tantalum carbide and titanium carbide, it was found that the TaC or β (WC-TiC solid solution) phase on the crater surface changed its carbon content so as to compensate the abrupt change of the carbon content in the binder phase, i.e. in the alloys. For example, the TaC or β phase acted as a source of diffusing-out of carbon when the carbide tool were forced to crater due to the above-mentioned mechanism. Thus, it was made clear that the reason why the alloys with tantalum and titanium carbides show excellent resistance to cratering.
(3) As the results, it was shown that the carbon contents of both carbide tools and machined steels play an important role in the phenomenon of cratering.抄録全体を表示PDF形式でダウンロード (2006K) -
江島 辰彦, 亀田 満雄1969 年 33 巻 1 号 p. 89-96
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn order to clarify the relative importance of various factors related to the solute diffusion in liquids, diffusion coefficients of germanium and nickel in liquid copper have been measured by a modified capillary reservoir method over the temperature range 1100° to 1300°C. Since germanium and nickel are the elements immediately next to the solvent metal copper in the periodic table, it is expected that the results of these diffusion experiments will provide valuable information concerning the mechanism of solute diffusion and the relative importance of various factors, particularly the effect of valence difference between solute and solvent ions for solute diffusion.
The results obtained in the current investigation are summarized as follows:
(1) The diffusion data fit the following Arrhenius type equations within the limits of experimental error in the temperature range 1100° to 1300°C.
(This article is not displayable. Please see full text pdf.)
(2) Apparent activation energy for the solute diffusion may be expressed in terms of the activation energy for self-diffusion of the solvent metal and the coulombic interaction between solute and solvent ions. The values calculated are in excellent agreement with the experimental values.
(3) Diffusion coefficients calculated from the relation between diffusion and viscosity coefficients proposed by several investigators agreed well with the experimental values in the order but not the magnitude.抄録全体を表示PDF形式でダウンロード (2492K) -
江島 辰彦, 亀田 満雄1969 年 33 巻 1 号 p. 96-103
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe understanding of diffusion phenomena in liquids is inferior in most respects to that of either gaseous or solid state diffusion. Accurate measurements of solute diffusion coefficients are therefore necessary for an adequate understanding of the theory of liquid diffusion, particularly the impurity diffusion in liquid metals. In order to clarify the relative importance of various factors for the solute diffusion in liquids, diffusion coefficients of iron and cobalt in liquid copper have been measured with a modified capillary reservoir method over the temperature range 1100° to 1300°C. Since iron and cobalt are the elements immediately next to the solvent metal copper, diffusion experiments of these system help in evaluating the effect of electrostatic interaction between solute and solvent metals and thus permit some insight into chemical diffusion generally.
The results obtained in the current investigation are summarized as follows:
(1) The diffusion data fit the following Arrhenius type equations within the limits of experimental error in the temperature range 1100° to 1300°C.
(This article is not displayable. Please see full text pdf.)
(2) Apparent activation energy for the solute diffusion may be expressed in terms of the activation energy for solvent diffusion and the coulombic interaction between solute and solvent ions. The values calculated are in good agreement with the experimental values.
(3) Experimental values are best represented by the modified critical fluctuation model if the value of β is taken as unity.抄録全体を表示PDF形式でダウンロード (2646K) -
本山 盛太郎, 米谷 茂1969 年 33 巻 1 号 p. 103-109
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe residual stress in case-hardening steels S 20 C and SCr 22 which were carburized at some different case depths (0.2 mm to 0.8 mm) and quenched by four sorts of cooling media was measured by the X-ray method, and it is shown that the distribution of residual stresses is correlated to the results of the tension test on these specimens. Also the specific volume at each part in these specimens is measured, and then the occurrence of the residual stress is discussed. The induced and subjected internal stress during the progress of martensite transformation in each part affects clearly these specific volume and residual stress after cooling.抄録全体を表示PDF形式でダウンロード (2106K) -
本山 盛太郎, 米谷 茂1969 年 33 巻 1 号 p. 109-115
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn the first report, the correlation between the residual stress and tensile strength of the carburized and quenched specimens was discussed. The difference or misfit between longitudinal and tangential residual stress distribution at the inner part in the specimen had relation to the results of the tension test.
In this report, the effect of tempering, hydrostatic pressing for the residual stress and the tensile and fatigue properties of these specimens is shown.抄録全体を表示PDF形式でダウンロード (2004K) -
本山 盛太郎, 米谷 茂1969 年 33 巻 1 号 p. 115-120
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe residual stresses in the case-hardening steel carburized to various case depths and hardened isothermally at 150° and 220°C are measured, at the same time the specific volume at each part in the specimens is measured. In order also to investigate the effect of specimens size on the normal quenching residual stress, the residual stresses in the 8 mmφ and 15 mmφ specimens which received the same heat treatment as the 11 mmφ specimen in the first report were measured. Thus the mechanism of occurrence of residual stresses and the correlation with tensile test results of these specimens are explained.抄録全体を表示PDF形式でダウンロード (1407K) -
増本 量, 沢谷 昭八1969 年 33 巻 1 号 p. 121-125
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーYoung’s modulus, rigidity modulus and thermal expansion in the palladium-gold system were measured at low and high temperatures after various heat-treatments and cold works. It has been found that the temperature coefficients of Young’s modulus and rigidity modulus of palladium-gold alloys annealed at 1000°C for 1 hr show a negative minimum value of −3.0×10−5 at a composition of 50% gold. However, the minimum turns to a positive value of 2.8×10−5 when heated at 360°C for 15 hr after water quenching from 1000°C or cold reducing of 96%. And the thermal expansion coefficient of palladium-gold alloys annealed at 1000°C for 1 hr has a minimum at composition of 48% gold. This minimum corresponds to the maximum temperature coefficient of Young’s modulus or rigidity modulus in the palladium-gold alloys. Moreover, the hardness of these alloys heated at 360°C for 15 hr after water quenching or cold working is about two times that in the annealed state. These alloys were named “PALLAGOLD” which is a abbreviation of palladium-gold alloy.抄録全体を表示PDF形式でダウンロード (1370K) -
増本 量, 斎藤 英夫, 門脇 静穂1969 年 33 巻 1 号 p. 126-129
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーRod-form single crystals of Pd-50%Au alloy about 2 mm in diameter and 7∼10 cm in length were prepared and the thermal expansion and Young’s modulus were measured over the temperature range −150° to 600°C with a dilatometer and by means of a vibrator-controlled oscillator system, respectively. From the measured values, Young’s moduli in the three principal directions of the single crystals were calculated. From the results it has been known that the Young’s moduli at 20°C are 5.76×105 kg/cm2, 11.80×105 kg/cm2 and 18.10×105 kg/cm2 in the ⟨100⟩, ⟨110⟩ and ⟨111⟩ directions of the single crystals, respectively. The Young’s modulus in the ⟨100⟩ direction of the single crystals increases with increasing temperature, attains a maximum at about 400°C and then gradually decreases, while the Young’s moduli in the ⟨110⟩ and ⟨111⟩ directions monotonously decrease. The calculated value for Young’s modulus of a polycrystal was found to agree fairly well with the measured one in the polycrystal specimen prepared by melting.抄録全体を表示PDF形式でダウンロード (1081K) -
増本 量, 村上 雄悦, 比内 正勝1969 年 33 巻 1 号 p. 130-134
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーMasumoto et al. discovered in the previous work high permeability alloy “Nimalloys” in the nickel and manganese system. Much subsequent works have been carried out on the effect of various element additions on the characteristic properties of nickel-manganese alloys and the highest initial permeability of 76000 and the highest maximum permeability of 441000 have been obtained. The results obtained by tin addition sto nickel-manganese alloys show that initial and maximum permeabilities are increased in general with increasing tin content: the alloy consisting of 77.07%Ni, 17.36%Mn and 5.57%Sn exhibits the highest initial permeability of 11200 when cooled at a rate of 240°C/hr from 900°C and by reheated at 440°C for 1 hr, while the alloy consisting of 75.19%Ni, 11.20%Mn and 13.61%Sn shows the highest maximum permeability of 73700 when cooled at a rate of 2800°C/hr from 900°C and reheated at 380°C for 15 hr. The latter alloy shows a magnetic hysteresis loss of 66.97 erg/cm3/cycle and a coercive force of 0.0182 Oe for the maximum magnetic induction of 5000 G, a magnetic induction of 5290 G at a field of 50 Oe and an electrical resistivity of 56.0 μΩ-cm at 20°C.抄録全体を表示PDF形式でダウンロード (1668K) -
西垣 進, 近藤 靖子, 長崎 隆吉1969 年 33 巻 1 号 p. 134-140
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーPure Be was oxidized in flowing CO2 at temperatures between 550° and 700°C. The observed feature of kinetic discontinuity was explained in terms of oxide morphology. The initial cubic rate results from the formation of an outer thin BeO film and the subsequent growth of the oxide crystallite coherent to the orientation of the underlying metal. The second stage, parabolic, is observed when the oxide looses the crystallographic coherency to the metal and grows as coarse crystals toward the [10\bar10] direction with their (0001) plane parallel to the oxidizing surface.抄録全体を表示PDF形式でダウンロード (2381K) -
小林 俊郎1969 年 33 巻 1 号 p. 141-142
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーPDF形式でダウンロード (196K) -
1969 年 33 巻 1 号 p. 142
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーPDFを参照． （誤）Ns=n·r⁄2, λ=1⁄√Ns=√2⁄n·r （正）Ns=√2n·r, λ=1⁄√Ns=√1⁄√2n·r抄録全体を表示PDF形式でダウンロード (15K)
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