巻号一覧
49 巻, 7 号
選択された号の論文の16件中1～16を表示しています
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小桧山 守, 高村 三郎1985 年 49 巻 7 号 p. 491-494
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーThe effect of irradiation on isochronal annealing curves of vanadium with frozen hydrogen produced by quenching was investigated by means of electrical resistivity measurements.
Hydrogen loaded specimens were quenched into liquid helium and isochronal annealing curves were measured. The same specimens were irradiated by fast neutrons and were quenched. The differences in the amount of frozen hydrogen and the recovering process were compared between the states before and after irradiation.
The resistivity increase after quenching was suppressed by irradiation and became unobservable with increasing radiation dose. These results were interpreted by trapping of hydrogen and by formation of hydride around radiation induced defects.抄録全体を表示PDF形式でダウンロード (557K) -
波多野 和好, 川本 信, 岡林 邦夫1985 年 49 巻 7 号 p. 495-500
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーRolling contact fatigue of cylindrical carbon steel test pieces was studied in the presence of a tangential force. The test was carried out under the conditions in which the contact stress was varied from 588 MPa to 1176 MPa and the tangential force was varied from 3.92 N to 205.8 N.
The structural change of the rolling contact fatigue surface was examined by X-ray diffraction, and the microhardness and microstructure at the rolling contact surface were also measured.
From the experiment, the following results are obtained.
(1) The tangential force acting on the contact surface reduces the rolling contact fatigue life.
(2) Effective strain and microhardness at the contact surface increase a little with the increase of the number of revolutions, and when these exceed certain values, surface cracks are observed at the surface.
(3) The cracks observed consist of main-cracks and branched sub-cracks, and these play as a whole major roles in producing pitting phenomena.抄録全体を表示PDF形式でダウンロード (1566K) -
古川 稔, 美浦 康宏, 根本 実1985 年 49 巻 7 号 p. 501-507
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーThe effect of strain rate on the yield stress of an Al-11.1 mol%Li alloy containing δ′-precipitates has been investigated at temperatures between 77 and 523 K and over the strain rate range from 1.77×10−4 s−1 to 1.77×10−2 s−1. At testing temperatures below 373 K, the yield stress is almost independent of strain rate at any aging stage. At testing temperatures above 373 K, the yield stress increases linearly with the logarithm of strain rate, and the strain rate dependence increases with increasing testing temperature. The yield stresses of under-aged alloy at temperatures between 373 and 473 K at high strain rates are greater than the yield stress at 77 K. For the alloy under-aged or aged nearly to its peak strength, the temperature range within which the positive temperature dependence of yield stress appears expands to the higher temperature side with increasing strain rate. The strain rate dependence of the yield stress is slightly negative at this aging stage. Within this temperature range, dislocations move in pairs cutting the δ′-L12 ordered particles. The yield stress of the over-aged alloy decreases monotonically with decreasing strain rate and with increasing testing temperature above 373 K. The modulus normalized yield stress is nearly constant at testing temperatures below 373 K at any strain rate investigated. In the over-aged alloy, dislocations by-pass the precipitates at any temperature and strain rate.抄録全体を表示PDF形式でダウンロード (1175K) -
斉藤 勝男, 細井 吉一, 日景 武夫1985 年 49 巻 7 号 p. 507-511
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーParameters m and β have been treated usually by the form (m+β) in the theoretical analysis of discontinuous deformation of alloys.
Several methods for the separation of (m+β) into individual have been reported in the literature. We propose a new method of separation by the introduction of the flow stress dependence of the mobile dislocation density. Application of this method to Al-Mg, Al-Zn and 7075-Al alloys showed its justification.
Experimental values of (m+β) are in good agreement with the calculated values by this method. Individual values of m and β are presented.抄録全体を表示PDF形式でダウンロード (583K) -
福地 正明, 渡辺 勝也1985 年 49 巻 7 号 p. 512-516
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーThe plastic behaviours of a Ni3Nb single crystal are studied by tensile and compression tests. Three shear systems are found to operate. They are (010)[001] slip, (010)[100] slip and {211}⟨‾10 7 13⟩ twin, and their critical resolved shear stresses (CRSS) are obtained as 44, 51 and 56 MPa in tension, and 55, 64 and 380 MPa in compression, respectively. In case of tensile test, a brittle fracture occurs in almost all the stress orientations, since the CRSS for {211} twin in tension is comparatively low and the twin plane is easy to cleave. Ductility can be expected under a tensile test, when the stress axis is parallel to [120], because at this stress orientation the twin system is difficult to operate. On the other hand, in a compression test the CRSS for the {211} twin is considerably high, and the single crystal is plastically deformed up to strain more than 15% by the operation of (010) slip system. For the stress orientations parallel to [010] or parallel to the axis on the [100]-[001] great circle, however, the (010) slip systems can not be operated and it breaks fragilly.抄録全体を表示PDF形式でダウンロード (1436K) -
大場 秋彦, 後藤 和弘1985 年 49 巻 7 号 p. 517-522
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーThe activity of Na2O has been measured, when “third oxide”, Li2O, Al2O3, CaO, Fe2O3 or B2O3 has been added up to 12 mol% to Na2O·2SiO2 melt at 1173 K to 1673 K.
The activity was obtained from the electromotive force of the Galvanic cell with solid electrolyte of beta-Na2O·11Al2O3 as follows:
(This article is not displayable. Please see full text pdf.)
The activity of soda was increased by addition of Li2O, Al2O3, CaO and decreased by B2O3. Ferric oxide did not affect the activity of soda.
The values of (dlogγNa2O)⁄(d mol%MO) were 0.07 for Li2O, 0.05 for Al2O3, 0.04 for CaO, zero for Fe2O3 and −0.05 for B2O3 at 1573 K.抄録全体を表示PDF形式でダウンロード (665K) -
泰松 斉, 阿部 倫比古, 中谷 文忠, 荻野 和巳1985 年 49 巻 7 号 p. 523-528
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーThe surface tensions of liquid Ag-O alloys and the contact angles between liquid Ag-O alloys and solid oxides were measured in Ar+O2 mixture at 1273 K by the sessile drop method. Poly-crystalline alumina, single-crystal alumina and fused quartz were used as the solid oxides. Oxygen is highly surface active and the maximum surface excess of oxygen is 5.8×10−6 mol·m−2. The wettability of polycrystalline alumina, single-crystal alumina and fused quartz byl iquid Ag-O alloys increased with increasing oxygen partial pressure. In the case of fused quartz which was most strongly wetted by liquid Ag-O alloys in high oxygen partial pressure, a reacted layer was observed in the interface. In this layer, metallic Ag particles less than 0.5 μm in size dispersed.抄録全体を表示PDF形式でダウンロード (1263K) -
葉 煦雲, 沼田 博雄, 春山 志郎1985 年 49 巻 7 号 p. 529-535
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーCarburization of iron foils of different thicknesses has been studied under CO-N2 atmosphere at 1173-1203 K by using an automatic microbalance. The rate of carburization was constant at the initial stage and then gradually decelerated by diffusion of carbon in the iron specimen until it was saturated with carbon. The initial rate was independent of the specimen thickness and probably controlled by a surface reaction. It was proportional to the partial pressure of CO at high pressures and to the square of the partial pressure at low pressures. This behavior was well explained by a kinetic equation that was derived by assuming a rate-controlling desorption of adsorbed oxygen atom created by dissociation of CO. The kinetic parameters of the surface reaction were obtained on the basis of the kinetic equation. The retardation of carburization reaction by diffusion in iron was discussed on the basis of a kinetic equation that was derived by solving the Fick’s equation in the presence of surface reaction. Discussion was made especially on the effects of the specimen thickness, the kinetic parameters of surface reaction and the diffusion constant on the rate of carburization.抄録全体を表示PDF形式でダウンロード (834K) -
岡田 道哉, 林 安徳1985 年 49 巻 7 号 p. 535-539
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーHydrogen permeation through iron were studied by the electrochemical oscillating hydrogen permeation method. The surface processes in the electrochemical hydrogen permeation in iron were discussed on the basis of the frequency dependence of the phase difference of the oscillating hydrogen charging currents at the cathodic side and the releasing currents at the anodic side. Contributions of the releasing process to the permeation could be disregarded by a potentiostatic regulation of the anodic surface. The surface effect was interpreted as the charging process, and the kinetics of the hydrogen charging was analyzed.抄録全体を表示PDF形式でダウンロード (621K) -
坂田 君子, 本間 一広, 小川 一行, 渡辺 治, 新居 和嘉1985 年 49 巻 7 号 p. 540-546
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーSolid state bonding of Fe and Al2O3 using an wüstite (written as FeO hereafter) interlayer was carried out by hot pressing at 1450 K for 3.6 ks in a vacuum of 10−3 Pa under pressure of 29.3 MPa. The interfaces between bonded materials Fe/FeO/Al2O3 were investigated by means of EPMA, X-ray diffractometry and TEM. (001) plane of an Fe single crystal was oxidized, in order to determine the micro-compositional variation at the FeO/Fe interface by AES and XPS. The change in the ratio of the Auger peak heights IO(503)⁄IFe(703) and the chemical shift ΔE of the Fe(2p3⁄2) depending on the distance from the oxidized Fe surface were measured by using Ar+ etching. It was found that in the region between 10 and 230 nm from the surface, IO⁄IFe was constant (=FeO). But in the region from 230 to 420 nm (T-region), it gradually and linearly decreased with increasing distance, until it began to drop exponentially to zero (=Fe). At the FeO/Al2O3 interface a new reaction layer about 6 μm in thickness was formed, which had a spinel type structure with the lattice parameter of 0.8171 nm showing broad diffraction lines. But electron diffraction photographs of the new reaction layer showed a hallow pattern. Tensile strength values of Fe/FeO/Fe and Al2O3/FeO/Al2O3 were 7.4 and 5.9 MPa, respectively, when the interlayer FeO was 300 μm in thickness, and they were 53.9 and 30.4 MPa, respectively, when the thickness was 50 μm. Fracture was observed not at the interfaces or in the T-region but in the brittle interlayer FeO in both cases of Fe and Al2O3. Therefore, it is clear that the T-region or the new reaction layer contributes to the FeO/Fe or FeO/Al2O3 bonding, respectively.抄録全体を表示PDF形式でダウンロード (2570K) -
三輪 謙治, 大橋 照男, 市川 理衛1985 年 49 巻 7 号 p. 546-551
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーSize distribution of primary solid particles suspended in hypoeutectic Al-Cu alloy slurry stirred rotationally under a partially solidified state is investigated. Especially, the effects of stirring rate (0.83-12.5 s−1), Cu concentration (6-20 mass%Cu) and addition of grain refiner (0.1 mass%Ti·B) on the size distribution of aggregated particles are discussed. It has been concluded that stirring under a partially solidified state determines the particle size of the primary phase by breaking up it and aggregating plural particles. Primary solid particles mostly consist of aggregated particles, and the ratio of aggregation is not strongly affected by the stirring rate and by addition of grain refiner. The size of aggregated particles decreases with increase in solid fraction and Cu concentration. On stirring at high rotation speed (12.5 s−1) or on addition of grain refiner under stirring, the size of aggregated particles becomes small at the stage of low solid fraction and scarcely decreases with increase in solid fraction. Component particles composing aggregated particles are refined with increase in solid fraction, and aggregated particles are consequently refined, too.抄録全体を表示PDF形式でダウンロード (2132K) -
大下 隆章, 武井 英雄, 畑山 東明1985 年 49 巻 7 号 p. 552-557
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーBoth the water quenched superplastic and air cooled non-superplastic 78%Zn-22%Al alloy were jointed by means of pressure welding under various conditions. The effects of pressure and welding temperature on the tensile strength and microstructure of the welded joints were investigated. The results obtained were as follows.
(1) The joint efficiency of the welded joint of the water quenched materials and that of the welded joint of the air cooled materials increased together with pressure and welding temperature. Under the optimum conditions, the joint efficiencies of the welded joint rose to more than 90%.
(2) Comparing the tensile strength of the welded joint of the air cooled materials with that of the joint of the water quenched materials welded under the same condition, the former was found to be larger than the latter.
(3) The joint efficency of the welded joint of the water quenched materials and that of the air cooled materials increased nearly 100% and 20% respectively by annealing after welding.
(4) The m value of the welded joint of the water quenched materials decreased a little by grain growth during welding, but at the heigher temperature than 440 K, m=0.3∼0.45.
(5) In the vicinity of the jointed plane, grain growth was induced during welding, and consequently the hardness was increased.抄録全体を表示PDF形式でダウンロード (1137K) -
中山 孝文, 増本 量, 菊地 紀雄1985 年 49 巻 7 号 p. 558-561
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーThe magnetization, the linear thermal expansion and the hardness of Mn-Sn alloys cooled down to room temperature in a furnace after homogenizing at 1070 K for 10.8 ks were investigated. Mn-23.8-24.4%Sn alloys show a stable η-single phase with a hexagonal structure and are ferromagnetic at room temperature. The alloys containing Sn more than 24.4% show a structure mixed with a ferrimagnetic hexagonal ζ phase. The Mn-Sn alloy with an η-single phase shows a maximum value of the magnetization of 0.4×10−6 Wb·m·kg−1 in a wide temperature range below the Néel point. In the mixed phase alloy, the Curie point of ferrimagnetism appears below the antiferromagnetic transition point, and the magnetization increases abruptly with decrease of the temperature. The linear thermal expansion of the Mn-Sn alloys with an η phase exhibits a relatively low coefficient below the Néel point. A maximum value of spontaneous volume magnetostriction of 0.7×10−2 was obtained in the Mn-24.4%Sn alloy. This value is about a half of that of the Invar type Mn-Ge alloys. The Vickers hardness of Mn-Sn alloys shows a minimum value of about 300 in the vicinity of the η phase region, and the hardness rapidly increases on the lower Sn side.抄録全体を表示PDF形式でダウンロード (564K) -
植田 洋史, 松井 昭彦, 古川 稔, 美浦 康宏, 根本 実1985 年 49 巻 7 号 p. 562-568
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーMeasurements were made of lithium loss in an Al-3.12 mass%Li alloy during the solution treatment at high temperatures under varied atmospheres. The microstructure and the hardness distribution in the surface layer of the alloy were highly sensitive to the temperature, the period and the atmosphere of solution treatment. A considerable amount of lithium was lost in the layer within 0.3 mm from the surface during the solution treatment in this study. Lithium loss during the solution treatment at 823 K for 3.6-36 ks was minimized by Ar gas sealing. The activation energy of diffusion of lithium in aluminum was estimated at 130 kJ/mol from the analysis of the hardness distribution curves. The process of lithium loss during the solution treatment in dynamic vacuum is considered to be controlled by the diffusion of lithium atoms toward the surface from the inside of the crystal.抄録全体を表示PDF形式でダウンロード (1989K) -
柳沢 平, 矢野 哲夫, 佐賀原 隆行1985 年 49 巻 7 号 p. 569-576
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーThe behavior of thermal expansion and contraction of Al-Al3Ni eutectic composites at elevated temperatures from 293 K to 823 K was analyzed by the rule of mixture. Variation of strain of the composite at constant temperatures, after the cooling and heating processes, was examined and the behavior of relaxation of residual stress was analyzed.
The thermal expansion curve during the heating process does not completely coincide with the contraction curve during the cooling process, which consequently leads to a large hysteresis loop. This phenomenon is caused by the existence of residual stress during the heating and cooling processes. At a constant temperature, the specimen tends to contract after heating and to expand after cooling. This tendency can be well explained by the stress-relaxation process of residual stress in the matrix. Assuming that the fiber is elastically deformed and the matrix creeps, the relaxation rate can be well expressed by the following equation, as a constitutive equation of creeping matrix.
(This article is not displayable. Please see full text pdf.)
\ oindentIt suggests the existence of the threshold stress, σm∞, below which the residual stress is not decreased.抄録全体を表示PDF形式でダウンロード (1073K) -
李 基淳, 諸住 正太郎1985 年 49 巻 7 号 p. 576-581
発行日: 1985年
公開日: 2008/04/04
ジャーナル フリーMolybdenum alloy ingots containing interstitial impurities less than 40 ppm were produced by arc-melting with 0.2 mass%Sc as a deoxidizer. Ingots were warm-forged to 65% in thickness at 1273 K and then rolled to 50% at 873 K. With those materials, effect of alloy elements, such as vanadium, niobium, titanium, zirconium and ruthenium, on the recrystallization temperature was investigated. Results obtained are as follows;
(1) Vanadium, niobium and titanium rise the recrystallization temperature, but their effect is small.
(2) Zirconium has a significant effect on the recrystallization temperature. Addition of 0.1 mass%Zr rises the temperature about 100 K.
(3) Ruthenium has a negative effect on the recrystallization temperature.抄録全体を表示PDF形式でダウンロード (2334K)
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