巻号一覧
37 巻, 4 号
選択された号の論文の19件中1～19を表示しています
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高橋 仙之助, 山本 英爾1973 年 37 巻 4 号 p. 373-375
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーThe elastic constants of polycrystalline nickel were measured in a temperature range of 20∼900°C, by the ultrasonic pulse echo method at 2.25 MHz with the longitudinal wave and the transverse wave.
The ultrasonic waves were transmitted to the specimen inserted in a furnace through a steel rod and the transducer was attached to the cooled end of the rod.
The values of Young’s modulus and shear modulus determined are 2.13×1012 and 8.13×1011 dyne/cm2 at room temperature, and 1.69×1012 and 6.4×1011 dyne/cm2 at 900°C, respectively.抄録全体を表示PDF形式でダウンロード (207K) -
森田 幹郎1973 年 37 巻 4 号 p. 376-379
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーBrittle filaments with high Young’s modulus, such as boron or graphite, are usually broken into pieces when tested under tension. To make clear the fracture mechanism, boron filaments were tensile tested monofilamentally, and the fracture processes were observed photographycally.
The following results were obtained:
(1) The filament fractured first at the weakest point where a relatively large imperfection might exist.
(2) Then, fracture due to the buckling occurred.
(3) Elastic stress wave interference caused the filament to break into pieces.抄録全体を表示PDF形式でダウンロード (766K) -
山本 達治, 移川 欣男1973 年 37 巻 4 号 p. 380-386
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーIt is well known that cast structure and crystal orientation influence strongly the magnetic properties of Alnico-type magnet alloy. The behaviors of magnetic properties of Alnico-8 magnet alloy prepared under various zone melting conditions of the horizontal type apparatus have been investigated. The results obtained are as follows: Magnetic properties and the crystal structure of these alloys are affected considerably by the traveling rate of the heating coil. The magnetic properties are remarkably deteriorated at a traveling rate of about 20 mm/hr. In this case, many crystals of the dendritic structure are observed microscopically and conic columnar crystals inclining 14∼20° to the specimen axis are observed macroscopically.
When zone melting proceeds in the temperature range of 1330∼1350°C, satisfactory magnetic properties are obtained. As the temperature of the melting zone is raised in vacuum, melting losses of Cu and Al show a remarkable increase as high as of about 50%.抄録全体を表示PDF形式でダウンロード (727K) -
中島 弘司1973 年 37 巻 4 号 p. 386-390
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーThe influences of temperature and composition on the densities of liquid metals and alloys of the Ag-Cd and Ag-In systems were measured by the pycnometric method. Using the least squares method the specific volumes at each composition were represented by the equation, v=v0(1+αT), within the experimental errors of ±0.1% for v0 and ±0.5% for α, respectively.
At constant temperature the molar valurnes in both Ag-Cd and Ag-In systems show a slightly negative deviation from additivity. The volume changes on mixing are calculated from the other thermodynamic data with Scatchard’s formula and are found to be conformable to the experimental ones.抄録全体を表示PDF形式でダウンロード (369K) -
小野 勝敏, 森山 徐一郎1973 年 37 巻 4 号 p. 390-393
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーFree energy of formation of the intermediate oxycarbide Al4O4C of the system Al2O3-Al4C3 was obtained by measuring CO-pressure of the three phase field, Al2O3-Al4O4C-C, which is given as
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\ oindentat 1400∼1600°C.
Preparation of aluminium oxycarbide in a pure state was not successful because of volatilization of aluminium and aluminium suboxides during the reaction of alumina and carbon at high temperatures. The samples consisting of Al2O3, Al4O4C and C were then prepared by reacting either alumina and carbon or aluminium, alumina and carbon at 1900°C.抄録全体を表示PDF形式でダウンロード (332K) -
宮本 学, 村上 陽太郎1973 年 37 巻 4 号 p. 394-399
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーAn investigation has been carried out to establish the influence of the metallographic factors on the stress-corrosion susceptibility of an Al-4.3% Zn-1.7% Mg alloy.
When an increase in the size of grain-boundary precipitates was achieved by quenching directly into an oil bath at 180°C, holding at that temperature for a certain time and then ageing at 70°C for 2 days, the life of the specimens increased considerably with increasing holding time at 180°C. On the other hand, the stress-corrosion susceptibility of the alloy, which was quenched into water at 0°C and then aged at 70°C, decreased with increasing ageing time at 70°C. These results can be explained in terms of a behaviour of grain-boundary precipitates. It also made clear that neither the dislocation substructure nor the matrix precipitate was related to stress-corrosion susceptibility. Moreover, scanning electronmicroscopic observation of fracture surfaces revealed that a stress-corrosion crack was initiated at an interface between the matrix and grain-boundary precipitates.
It is concluded that the stress-corrosion susceptibility depends largely on the behaviour of grain-boundary precipitates and neither on the width of PFZ nor on the type of matrix precipitates.抄録全体を表示PDF形式でダウンロード (1101K) -
久保 紘, 平野 賢一1973 年 37 巻 4 号 p. 400-406
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーA phenomenological theory of martensite with long period stacking order involving composite shear has been applied to the martensitic transformation from β1 (ordered phase of Fe3Al type) to β1′ (4 H structure) in Cu-24.5 wt% Sn alloy.
Besides many stacking faults on (122)β1′ planes, the existence of twin faults on (1\bar22)β1′ planes has been detected by transmission electron microscopy. It has been assumed in the present analysis that the slip shear on the (122)[\bar2\bar34]β1′ system precedes the twinning shear on the (1\bar22)[\bar234]β1 system. In this case, the magnitude of the twinning shear g2=−0.0225 can give rise to the minimum magnitude of shape displacement. The theoretical prediction on the habit plane and orientation relationship between β1 and β1′ corresponding to this condition is in fairly good agreement with the available experimental results.
On the other hand, if g2=0, the theory predicts two crystallographycally nonequivalent habit planes. In this case, the agreement between the theoretical predictions and the experimental results is not so good as in the above case.抄録全体を表示PDF形式でダウンロード (595K) -
香山 滉一郎, 橋本 雍彦1973 年 37 巻 4 号 p. 406-411
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリー(1) In order to measure the activities of Ti in Ti-C solid solutions, three kinds of cells,
[ (a)] Ti, TiF3|CaF2|TiF3, Ti-C [ (b)] Ti, TiF3-CaF2|CaF2|CaF2-TiF3, Ti-C [ (c)] Ti, KTiF4, K3TiF6|CaF2|K3TiF6, KTiF4, Ti-C were constructed, and useful data were obtained by using the cell (c). Cells (a) and (b) were both unsuitable for measurement.
(2) Standard Gibbs free energy of formation ΔGf° of TiC1.0 at 580°C was −45.3 kcal/mol.
(3) The activities of Ti in TiC1.0, TiC0.92, TiC0.89, TiC0.81, TiC0.76, TiC0.71 were 2.4×10−12, 1.52×10−11, 5.2×10−11, 1.15×10−6, 9.13×10−3, 1.87×10−1, respectively.
(4) The activities of C in Ti-C were calculated from the activities of Ti using Gibbs-Duhem’s equation, and the free energies of mixing were calculated from the activities of Ti and C. A minimum value of −22.4 kcal/mol for the free energy of mixing was obtained at the composition NC=0.45 (TiC0.82).抄録全体を表示PDF形式でダウンロード (475K) -
姜 文圭, 内田 熊男, 井本 正介1973 年 37 巻 4 号 p. 411-416
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーThe hydrolytic reactions of zirconium mononitride and monocarbide by superheated steam have been studied. In the case of ZrN the products were found to be H2, N2 and NH3, with a small amount of NO. The amount of NH3 reached a maximum at 700°C in isothermal reactions and at higher temperatures NH3 was gradually replaced by N2. Compared with the hydrolysis of TiN, it is characterized by the formation of a larger amount of NH3, probably due to the lower reaction temperature for ZrN. The reaction mechanism of ZrN can be represented by an equation similar to that of TiN.
By the hydrolysis of ZrC, CO2, CO, H2 and a small amount of CH4 were produced. The amount of CO2 Was maximum at 700°C and more CO was evolved with increasing temperature. X-ray analysis revealed that the hydrolyzed product consisted of metastable tetragonal ZrO2 at temperatures lower than 700°C and monoclinic ZrO2 at temperatures higher than 800°C. The reaction equation for the hydrolysis of ZrC was also estimated. CO2 was found to be produced accompanying equal moles of H2 at the later stage of the hydrolysis of ZrC as in the case of TiC. The supposition made for the case of TiC that the formation of CO2 and H2 in nearly equal moles could be attributed to the steam gas reaction involving CO in the solid residue was confirmed by the measurement of weight loss after re-hydrolysis and by X-ray diffraction technique. The amount of CO contained in the solid residue was larger than that for TiC.抄録全体を表示PDF形式でダウンロード (413K) -
佐々木 達治, 酒井 武明, 松田 若竹, 花田 曠嗣1973 年 37 巻 4 号 p. 417-421
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーThe magnetic composite wire for memory applications made by the cladding and drawing method has been developed. The origin of magnetic anisotropy in the composite wire was investigated. Magnetic composite wires 0.1 mm in diameter which consisted of CZC (0.80% Cr-0.20% Zr-bal Cu) as the core and Mo-permalloy (81.3% Ni-4.5% Mo-0.4% Mn-bal Fe) as the surface layer 3, 4 and 8 μm in thickness were made, and hysteresis loops in the axial and circumferential directions as well as output signals as memory element were measured.
In the cold-drawn composite wires there exists strong anisotropy with the easy direction in the wire axis. In the composite wires annealed near 600°C, however, anisotropy with the easy axis in the circumferential direction grows. This anisotropy desirable for memory applications becomes remarkable as the thickness of the magnetic layer decreases. In expectation of strain-induced anisotropy, lattice spacing in the magnetic layer, dilatation of CZC and Mo-permalloy, tensile strength of the composite wires, etc. were measured. In the composite wire with the easy axis in the circumferential direction, the residual stress in the magnetic layer is anisotropic; compressive in the circumferential and tensile in the axial and radial directions.
As the result, it was concluded that the combination of anisotropic residual stress and negative magnetostriction in the magnetic layer favors the magnetization in the circumferential direction.抄録全体を表示PDF形式でダウンロード (425K) -
今井 勇之進, 花田 修治1973 年 37 巻 4 号 p. 422-427
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーThe martensitic transformation induced by plastic deformation at sub-zero temperatures in 18-8 type austenitic stainless steels has been studied a great deal.
In the present work the martensitic transformation not induced by deformation but by holding isothermally above the Ms temperature was investigated by means of transmission electron and light microscopy (especially by using the magnetite powder method). In an earlier stage of isothermal holding, both ε and α′ martensites were often observed, but the former decreased and the latter increased with increasing holding time.
By comparing with isothermal martensitic transformation in an Fe-Ni-Mn alloy containing no ε martensite in transformation products, ε was found to contribute to the nucleation of isothermal martensite in an Fe-Cr-Ni alloy. These observation suggest that most of α′ formed isothermally should be related to the ε.抄録全体を表示PDF形式でダウンロード (1260K) -
三浦 維四, 平野 進1973 年 37 巻 4 号 p. 428-432
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーThe tensile behavior has been observed on the metallic composites arranged in a chequered flag pattern with two elements of metals which are soluble and insoluble in each other. The composites were prepared by hot pressing; the condition for the Al-Cu composite was 2 hr at 550°C and that for the Cu-Fe composite was 24 hr at 950°C under a total pressure of 2 tons.
The Al-Cu composite of the soluble type, formed an intermetallic compound at the interface when the composite was fabricated and its tensile behavior was greatly influenced by this intermetallic compound. The tensile behavior of Cu-Fe composite of the insoluble type, was influenced by the Cu elements having a low elasticity compared with Fe.抄録全体を表示PDF形式でダウンロード (582K) -
新宮 秀夫, 小林 紘二郎, 下村 純志, 尾崎 良平1973 年 37 巻 4 号 p. 433-440
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーAl-Si alloys have been splat cooled under various cooling conditions and their structures have been examined. The measured cooling rate varied from 105°C/sec to 107°C/sec depending mainly on the condition of thermal contact between specimen and substrate. Assuming the Newtonian cooling, the solidification rate was estimated to be about 10 cm/sec for the cooling rate of 106°C/sec. The lattice parameter of aluminum decreased with silicon content up to about 16% indicating the extended solid solubility, but increased again for higher silicon content. The changes in splat temperatures from 600°C to 1000°C did not affect the extended solid solubility limit. When the substrate temperature was raised to 150°C the solid solubility started to decrease and for the substrate temperature higher than 300°C the lattice parameter of aluminum stayed at the equilibrium value. Transmission electron microscope observations showed no silicon phase up to 12% Si, but the electron diffraction spots of silicon were detected in the specimen with 16% silicon. Silicon particles were observed for specimens of lower silicon content when the cooling rates were small. The silicon particles were finely dispersed in aluminum grains and the crystallographic orientation was found, by careful examinations of selected area diffraction patterns, to coincide completely with that of matrix aluminum. The coincidence in the orientation between aluminum and silicon phases remaind undestroyed by aging at elevated temperatures. The aluminum grain size decreased to the order of 100 Å for specimens with more than 20% silicon. The measurements of the recovery in electrical resistance during the isochronal aging revealed that the supersaturated solid solutions are stable at room temperature and start to decompose at temperatures higher than 100°C.抄録全体を表示PDF形式でダウンロード (1157K) -
高橋 平七郎, 竹山 太郎1973 年 37 巻 4 号 p. 441-447
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーThe present work was concerned with an experimental study of Lüders band propagations in the blue-brittleness range and its analysis of some parameters, that is, dislocation structures, stress dependence of the propagation velocity, and others. The specimen used was an α-iron containing 0.006 wt% carbon. The correlation between the stress drop and the decay time during the band propagation was obtained by using an oscillographic recorder. Also, dislocation structures were observed by means of transmission electron microscopy.
Dislocation structures were tangled and the average dislocation density was about 8×109/cm2 in the temperature range from 160 to 250°C. The magnitude of the stress drop did not directly depend on the amount of dislocation generated and its multiplication rate, but on the width of Lüders band propagated. The propagation velocity of Lüders band could be expressed by the same relation as the stress dependence of dislocation velocity. The dislocation velocity exponent, m, derived from the relation between the stress drop and the decay time was approximately 18 in the temperature range investigated. With increasing temperature, initial velocities of Lüders propagation became higher, i.e. about 55.6 cm/sec at 160°C, 312.4 cm/sec at 200°C, and 595.5 cm/sec at 250°C. This temperature dependence of the velocity could be associated with that of the stress concentration factor caused by dynamical strain ageing near the Lüders band front.抄録全体を表示PDF形式でダウンロード (892K) -
松木 賢司, 山田 正夫1973 年 37 巻 4 号 p. 448-454
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーA study of the high temperature deformation behavior and microstructure has been carried out for Al-Zn-Mg alloys containing Zr, prepared by severe cold rolling and recrystallization to give an equiaxial fine grain structure. The main results obtained were as follows:
(1) These alloys are considered to be in a single phase above about 400°C and exhibit a superplastic behavior under optimum conditions of deformation temperature and strain rate.
(2) The apparent activation energy for superplastic deformation was estimated to be about 21.2 kcal/mol for 7 N alloy and about 17.7 kcal/mol for 8 N alloy respectively. These values correspond approximately to the activation energy for grain boundary diffusion for Al.
(3) The flow stress of 8 N alloy at 520°C is proportional to La at different constant \dotε. And the value of a is approximately close to unity.
(4) After superplastic deformation, the formation of voids at the grain boundary and grain growth occur, and the scratch scribed on the specimen offsets at the grain boundary.
(5) On the basis of these facts it seems reasonable to assume that the superplastic deformation of these alloys is mainly due to the grain boundary sliding accompanied by the grain boundary migration.抄録全体を表示PDF形式でダウンロード (923K) -
小松 伸也, 石谷 誠男, 伊木 茂男, 幸塚 善作1973 年 37 巻 4 号 p. 455-462
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーThe EMF of the following cells was measured in order to estimate the ion transport number of mullite with excess SiO2 (MLS):
(This article is not displayable. Please see full text pdf.)
\ oindentMullite specimens of three different compositions were used as solid electrolytes. The EMF measurement was carried out in the temperature range of 800∼1100°C. The oxygen partial pressnre p\ominus, at which the ion transport number is 0.5, was calculated from the EMF of cell (I) and it was found that the p\ominus became smaller with decreasing SiO2 content in the mullite. The smallest p\ominus was obtained for the mullite of 36.3 wt% SiO2 and represented as
(This article is not displayable. Please see full text pdf.)
\ oindentwhich was in the same order as the p\ominus of ZrO2·CaO estimated in our previous work.
The EMF of cell (II) showed poor reproducibility and strong time dependency. The origin of these phenomena was investigated on the basis of a few experimental results.
Also, the electrical resistivity of mullite was measured in the range of pO2=10−3.5∼10−19 at 870°C and it was found that the electrical resistivity had a very small dependency on oxygen partial pressure. The activation energy of conduction was about 0.8 eV.抄録全体を表示PDF形式でダウンロード (630K) -
増本 量, 中村 直司1973 年 37 巻 4 号 p. 462-465
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーThe temperature coefficient of delay time, αD, at 0 to 40°C and the maximum gradient of magnetostriction to magnetic field, (dλ⁄dH)m, at room temperature have been measured with the annealed alloys in the Co-Fe-Cr system, the Co-Fe-Cr-about 16.7% Ni system and the Co-Fe-Cr-about 28.6% Ni system. It has been found that in Co-31.0% Fe-9.0% Cr alloy the αD has such small value as −0.42×10−5. The (dλ⁄dH)m is 0.36×10−6/Oe and is comparable with the absolute value of −0.39×10−6/Oe in nickel. The αD for Co-37.8% Fe-4.3% Cr-16.7% Ni alloy also shows a very small value of −0.07×10−5, while its (dλ⁄dH)m shows a very large value of 0.80×10−6/Oe which is about two times greater than the absolute value of nickel and five times greater than that of Ni-Span C. And Co-50.0% Fe-2.4% Cr-28.6% Ni alloy has a small value of +0.21×10−5 for αD and 0.19×10−6/Oe for (dλ⁄dH)m which is about half of the absolute value of nickel. Among these alloys, Co-37.8% Fe-4.3% Cr-16.7% Ni alloy not only exhibit the excellent characteristics in its magnetostrictive delay line but also can easily be cold worked. Therefore, the alloy seems to be a material suitable for the delay line.抄録全体を表示PDF形式でダウンロード (312K) -
後藤 正治, 江刺 清行, 幸田 成康, 諸住 正太郎1973 年 37 巻 4 号 p. 466-473
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリーA series of hyper-eutectic alloys has been unidirectionally solidified under various conditions in order to investigate the controlled structure change, eutectic or eutectic plus dendrite, and solute redistribution along the solidified direction. The results obtained are as follows: (1) In lower solute content hyper alloys, full-eutectic structures were obtained in an early stage of solidification, but, with the progress of solidification, the growth of eutectics with a phase dendrites was revealed. Otherwise, in higher content alloys, rod eutectic structures with TiZn15 dendrites were obtained in an early stage, but in the advanced solidification the TiZn15 dendrite phase decreased, the amount of which depended on the solidification rate. (2) With increasing solute content in the liquid phase and decreasing solidification rate, a larger solute segregation has been determined along the solidified direction. (3) The above results show that at high solidification rates, the Zn-Ti alloy exhibits a compositional range in eutectic structures skewed towards the hyper-eutectic compositions. (4) Accordingly, it is possible to obtain a full-eutectic structure with a controlled volume fraction of two phases even from the off-eutectic alloy fabrication.抄録全体を表示PDF形式でダウンロード (1825K) -
1973 年 37 巻 4 号 p. 473
発行日: 1973年
公開日: 2008/04/04
ジャーナル フリー
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