巻号一覧
48 巻, 12 号
選択された号の論文の12件中1～12を表示しています
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福富 洋志, 田中 睦人, 上城 太一, 堀内 良1984 年 48 巻 12 号 p. 1133-1137
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーAluminium polycrystal specimens were creep deformed and grain boundaries which showed a constant grain boundary sliding vs migration ratio were examined, in order to verify experimentally the grain boundary behavior by the motion of perfect DSC dislocation. Orientation measurements showed that 90% of the grain boundaries were coincidence grain boundaries.
Behaviors of several kinds of the coincidence grain boundaries were examined in detail by the use of bicrystals. It was found that the grain boundary sliding accompanying migration was quantitatively explained as the motion of perfect DSC dislocations.抄録全体を表示PDF形式でダウンロード (1079K) -
小坂井 孝生, 水野 慎也, 土井 稔, 宮崎 亨1984 年 48 巻 12 号 p. 1138-1143
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーStructural changes during ageing in Co-Cu supersaturated solid solutions prepared by the liquid quenching were investigated by means of transmission electron microscopy.
By the liquid quenching, fcc supersaturated solid solutions of the Co-Cu alloys are produced for all composition ranges except the center part of the miscibility gap. These alloys decompose spinodally during ageing so that the typicai ⟨100⟩ modulated structures and satellites associated with electron diffraction spots are formed. On the basis of a theoretical analysis on the experimental results, coherent spinodal temperatures. Ts, and the coherent interaction parameters for several alloys were determined. The coherent spinodal line calculated shifts toward the Cu side and has a broad extension along the magnetic transformation line.抄録全体を表示PDF形式でダウンロード (2323K) -
大塚 正久, 堀内 良1984 年 48 巻 12 号 p. 1143-1151
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーIn order to make clear the origin of the ductility loss of an Al-5.7 mol%Mg alloy which contains no second phase particles on the grain boundary, boundary behaviors have been examined mainly with metallographic techniques. Under the condition of ductility loss, cavities and cracks were formed preferentially along those grain boundaries on which shear stress acted. The ductility loss was accompanied with the sliding of grain boundaries which were serrated as a result of boundary migration. From these results an idea is proposed that the ductility loss is caused by the cavity nucleation which is enhanced by the stress concentration occurring by the sliding along serrated grain boundaries under the high flow stress characteristic of the present solid solution alloy. This idea is justified by the tensile test on bicrystal or tricrystal specimens which contain a grain boundary inclined at π⁄2 or π⁄4 rad to the tensile axis.抄録全体を表示PDF形式でダウンロード (3063K) -
田原 晃, 林 安徳1984 年 48 巻 12 号 p. 1152-1156
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーThe permeation response of hydrogen and deuterium through nickel under the oscillating pressure condition was measured to determine the diffusion coefficient including no surface effect, and the characteristics of the surface effect were also analysed in its isotope dependence.
The diffusion coefficients of H and D in Ni determined by the pressure oscillation permeation method are;
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The isotope dependence of the surface effect is that the equilibration of gas phase and solid solution in nickel is attained faster for hydrogen than for deuterium.抄録全体を表示PDF形式でダウンロード (627K) -
田中 紘一1984 年 48 巻 12 号 p. 1157-1162
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーThe evaluation of fracture toughness by the application of indentation techniques is conducted based on a spherical inclusion model proposed by Tanaka et al. in comparison with an expanding spherical cavity model by Lawn et al. (LEM model). In the case of well-developed half-penny cracks the latter gives predicted values more than three times as high as experimental ones obtained by the conventional methods, while the former provides comparable values. This is mainly due to the difference in the hypotheses on the plastic accommodation way of the impressed volume. The spherical inclusion model assumes a one-directional plastic accommodation in the direction of impression, while the LEM model does a volumetric one. It is demonstrated that the calibrated equation using the experimental literature data is suitably given by
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\ oindentwhere Kc is the toughness, P the load and a a half of the crack size. This is in contrast to the calibrated equation by the LEM model, which involves the hardness-to-modulus ratio.抄録全体を表示PDF形式でダウンロード (833K) -
池野 進, 上谷 保裕, 多々 静夫1984 年 48 巻 12 号 p. 1163-1167
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーIn order to investigate the effect of grain size, tensile tests were performed for Al-7 mass%Mg alloys having various grain sizes.
Results obtained are as follows:
(1) In the lower temperature range, the activation energy for onset of serrated yield is found to be about 23 kJ/mol and does not depend on the grain size.
(2) In the relatively high temperature range, strain for onset of serrated yield (εc) becomes larger with rising temperature in the grain size range from 20 to 800 μm.
While, in the specimen having 1300 μm of grain size, serrated yield occurs at an early stage in the plastic deformation, and the value of εc is almost independent of deformation temperature.
In the grain size range from 20 to 400 μm, the relation between grain size (d) and stress (σc) required for the onset of serrated yield is expressed as follows:
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\ oindentwhere σ0 is a frictional stress of mobile dislocation and Kc is a constant.抄録全体を表示PDF形式でダウンロード (713K) -
不破 章雄, 菅原 憲次, 加藤 栄一1984 年 48 巻 12 号 p. 1168-1175
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーAs one of the effective means for analysis in high temperature metallurgical processes involving gaseous species, a combination system of a transpiration reactor and mass spectrometry has been constructed. After obtaining the mass separation factor at nozzle-skimmer orifices, the vapour pressure of zinc has been measured. The system is composed of the transpiration reactor where the specimen material evaporates, sublimes or reacts with gas, the nozzle-skimmer orifices for differential evacuation where the vapour of near-atomospheric pressure in the reactor is introduced adiabatically into a low pressure chamber, and the mass spectrometer for identification of vapour species and intensities.
Upon the adiabatic introduction of gaseous species using the differential evacuation system, there takes place the mass separation, i.e. the different compositional changes in the transpiration reactor and detected by mass spectrometry. In this study, mass separation factors have been experimentally obtained using inert-gas mixtures of known compositions.
Vapour pressure measurement of zinc has been made by observing the ion intensities of 64Zn+ peaks under a saturated flow condition using the Ar carrier gas and the calibrated ion intensities using the mass separation factors. The Zn vapour pressure thus obtained is in good agreement with the literature values:
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一色 実, 富園 孝夫, 吉田 友晶, 大川 敏彦, 井垣 謙三1984 年 48 巻 12 号 p. 1176-1179
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーHigh purity zinc, one of the important constituent elements of II-VI compound semiconductors, has been prepared by vacuum distillation and overlap zone-melting methods. Residual resistivity ratio (RRR) measurements and activation analyses have clarified the purification effect of both methods. The highest value of RRR obtained on a polycrystalline specimen is 25600.抄録全体を表示PDF形式でダウンロード (505K) -
溝口 数一, 山根 政博, 金子 泰成, 杉之原 幸夫1984 年 48 巻 12 号 p. 1179-1186
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーThe quantitative analysis of oxygen ions existing in the Na2O-SiO2-Al2O3 and CaO-SiO2-Al2O3 glasses, using XPS, was carried out in order to investigate the effect of Al2O3 on the structure of the silicate.
The results were explained as follows:
(1) The O1s spectra obtained by XPS were able to be quantitatively analyzed into the four kinds of oxygen ions, i.e. O0, O−, Si-O-Al and Al-O-Al, which represented the several bonding states of oxygen in the aluminosilicate.
(2) The analyzed values of O1s were in a good agreement with those estimated on the basis of infrared absorption spectra and the existence ratio of the tetrahedrally coordinated Al3+ ions to the total Al3+ ions which was derived from the viscosity measurement of ternary aluminosilicate melts.
(3) In the range of the molar ratio Al2O3/MO<1, Al2O3 acts mostly as a network former in the Na2O systems, but behaves as the amphoteric oxide in the CaO systems with a considerable amount of octahedrally coordinated Al3+ ions.抄録全体を表示PDF形式でダウンロード (1203K) -
秋山 哲也, 泉 真吾, 寺崎 俊夫1984 年 48 巻 12 号 p. 1187-1191
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーThe effect of inclusions in a weld metal and that of inclusions in the HAZ on the hydrogen-induced HAZ cracking are studied separately. If inclusions in the weld metal are available for the improvement of the sensitivity to the cracking, it is useful to improve welding rods, and if inclusions in the HAZ are available, it is necessary to improve base metals.
Results obtained with an implant test specimen reformed are as follows:
(1) When the initial hydrogen content HF is 1.6 ppm, the weld metal which obtains 0.03 mass%Ti or 0.01 mass%S increases the critical stress by about 20-50 MPa.
(2) When the initial hydrogen content HF is 1.6 ppm, the HAZ which obtains 0.03 mass%Ti or 0.01 mass%S increases the critical stress by about 60-120 MPa, and this increment of critical stress is 2 or 3 times as large as that caused by the weld metal.
(3) When the initial hydrogen content HF is increased up to 5.5 ppm, the HAZ which obtains 0.03 mass%Ti or 0.01 mass%S dose not increase the critical stress.抄録全体を表示PDF形式でダウンロード (741K) -
砥綿 真一, 山田 銑一1984 年 48 巻 12 号 p. 1192-1198
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーSilicon-carbide fibers produced from organosilicon polymer were incorporated into Al alloys by the squeeze casting method. The effects of Mg and Si on the compatibility of silicon-carbide fiber with Al alloys were investizated by bending, tests of the composites, tensile tests of fibers extracted from the composites, and D.T.A. analysis.
The main results are as follows:
(1) Mg or Si in the matrix degraded noticeably the bending strength of silicon-carbide fiber-reinfoced aluminum alloys. The bending fracture surfaces were saw-shaped at a bending strength σb\fallingdotseq0.9 GPa and were flat at σb≤0.5 GPa.
(2) Mg or Si in the matrix degraded noticeably the tensile strength of fibers in the composites, which were tested after extraction from the composites. Eutectic Si was observed on the surfaces of fibers extractect from Al-Si alloy composites.
(3) Ratios of the bending strength of the composites to the ROM (rule of mixture) strength were 0.76 for pure Al, 0.95 for Al-Mg alloy and 0.5 for Al-Si alloy matrices.
(4) It was found by D.T.A. analysis that aluminum-carbide and metallic si were formed by the exothermic reaction above 1000 K in Al-0.5 mass%Mg, above 1050 K in Al-1.5 and 5 mass%Mg alloy matrices.
(5) The addition of Si(1-20 mass%) or Mg(0.5-5 mass%) to the matrix is undesirable for the strength of silicon-carbide fiber-reinforced aluminum alloys.抄録全体を表示PDF形式でダウンロード (1683K) -
浅沼 博, 大蔵 明光1984 年 48 巻 12 号 p. 1198-1203
発行日: 1984年
公開日: 2008/04/04
ジャーナル フリーApplicability of the combination process of plasma spray and roll diffusion bonding method to the fabrication of CF/Al composites has been investigated. In the present studies, oxidation states of CF/Al composites fabricated by this process (open system) and the stability of CF/Al composites during heating (873 K), which is one of the important properties expected for CF/Al composites, are investigated.
The results are as follows:
(1) In the case of CF/Al composites fabricated by this process, formation of γ-Al2O3 on fiber surface occurs.
(2) The γ-Al2O3 formed on fiber surface maintains the tensile strength of CF/Al composite during heating at 873 K by inhibiting harmful reaction between fiber and matrix.
The formation of γ-Al2O3 is industrially important as a method of fiber coating without additional process and cost.抄録全体を表示PDF形式でダウンロード (1877K)
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