巻号一覧
53 巻, 5 号
選択された号の論文の7件中1～7を表示しています
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研究論文
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野上 敦司, 椿野 晴繁, 寺澤 倫孝, 三田村 徹, 山ノ井 智明, 木野村 淳, 堀野 裕治2003 年 53 巻 5 号 p. 195-199
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーSurface segregation of Pb in high purity Al–13 at-ppm Pb foil annealed at 813–923 K in different environments, open air and vacuum (about 0.1 Pa) in addition to argon gas, was studied by RBS and TEM observations. In an open air and argon atmospheres, the surface segregation increased with annealing time but it was decreased with annealing in vacuum. TEM observations revealed that most of the lead element in the foils segregated not to the aluminum foil surface, i.e., aluminum/oxide interface, but to the oxide film, amorphous phase, formed just above the foil surface by annealing in open air or argon gas atmospheres, though the thicker oxide film was formed in the air environment. When the foil annealed in an argon gas at first and then annealed in vacuum, the amorphous oxide phase transformed to fine crystalline of γ–Al2O3, which was introduced by the decrease of lead element. The competition between the thermal diffusion of lead through aluminum matrix and the vaporization of lead at the oxide film surface resulted in the surface segregation of lead. In-situ TEM observations using hot stage was also confirmed clearly the vaporization phenomena of lead from foil surface.抄録全体を表示PDF形式でダウンロード (452K) -
中村 健治, 冨吉 昇一2003 年 53 巻 5 号 p. 200-204
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーThe phase transformations from the ε- to τ-phases for alloys with the composition of Mn53.6–Al46.4 doped with carbon were investigated using SEM with EDS, optical microscopy and XRD, where the ferromagnetic τ-phase was clearly visualized by suspending a ferromagnetic colloid fluid. When the quenched specimen of the ε-phase was annealed at 600°C, the aluminum rich γ2-phase occurs first at grain boundaries and after that the τ-phase grows inside grains around the γ2-phase. These results indicate that the precipitation of the γ2-phase leads an increase inMn concentration in the ε-phase and the growth of the τ-phase occurs from grain boundaries when it reaches at the eutectoid concentration (55 at%Mn). Our observations that the nucleation and growth processes occur first from the grain boundaries, no change of the concentration between the ε- and resulting τ-phases suggest that this phase transformation is the massive type one.抄録全体を表示PDF形式でダウンロード (527K) -
樫原 恵蔵, 田上 稔, 岡田 達也, 猪子 富久治2003 年 53 巻 5 号 p. 205-211
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーDeformation and recrystallization experiments are performed using an aluminum bicrystal specimen with twin boundary at initial orientation, against which both edge and screw dislocations in component crystals are piled up. After deformation to 48% strain, deformation bands (DBs) develop in deformed matrixes (DMs) along the grain boundary (GB). The interaction of piled-up dislocations at the GB is discussed from two criteria of stress and dislocation transmissions through GBs. It is found that the screw dislocations are difficult to accumulate excessively at the GB, whereas the edge dislocations are steadily stored at the GB. After annealing of the specimen, coexistence of two kinds of recrystallized grains (RGs) due to the strain induce grain boundary migration (SIBM) and the <111>rotated recrystallization model is recognized. The SIBM RGs take place along the GB. The<111>rotated RGs are formed at the DBs away from the GB. It is considered that the SIBM is caused mainly by the accumulation of edge dislocations. The formation of the<111>rotated RGs can be explained from the<111>rotation recrystallization model and the slip systems with Schmid factor of zero at the initial orientation.抄録全体を表示PDF形式でダウンロード (426K) -
藤井 秀紀, 菅又 信, 金子 純一, 久保田 正広2003 年 53 巻 5 号 p. 212-217
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーEffect of minor addition of Sc+Zr has been studied on the structures and mechanical properties of rapidly solidified Al–9%Zn–2.5%Mg–1%Cu based alloys containing transition metals (Co, Fe, Fe+Ni, Mn). The amount of Sc and Zr addition was 0.2 mass% each. Rapid solidification was performed by gas atomizing and splat quenching onto a water cooled Cu single roll. Consolidation of the flakes was done by cold pressing, vacuum degassing and hot extrusion. Uniform distribution of Al3(Sc, Zr) particles was observed by TEM in the as-extruded P/M materials with Sc+Zr addition. Hardness became higher for the as-extruded P/M materials with Sc+Zr addition than those without addition even after annealing at higher temperatures. Uniform distribution of Al3(Sc, Zr) and η' particles were observed in the T6 treated P/M materials. The size of η' particle is smaller than Al3(Sc, Zr) particle. The T6 treated P/M materials with Sc+Zr addition showed higher hardness than the as extruded materials. However, T6 treated alloys with Sc+Zr addition did not always show higher tensile strength and fatigue strength than those without addition.抄録全体を表示PDF形式でダウンロード (489K) -
高田 尚記, 池田 賢一, 吉田 冬樹, 中島 英治, 阿部 弘2003 年 53 巻 5 号 p. 218-223
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーThe present study was carried out to clarify the effect of condition of thermo-mechanical treatment (partial annealing and additional rolling) on behavior of cube texture in high purity aluminum foils for electrolytic capacitor. Foils were partially annealed at 503, 523 and 543 K and additionally rolled to 12, 17 and 22% reduction. They were finally annealed at 573 K. All foils were evaluated by SEM–EBSP method. It was elucidated that the foil partially annealed at 523 K and additionally rolled to 17% reduction, had larger area fraction of cube-oriented grains than the other foils after final annealing. From the examination of that, it was concluded that the distribution and diameter of cube-oriented grains depended on the partial annealing temperature and that grain growth in final annealing was affected by the residual strain in grains attributed to the degree of reduction of the additional rolling. It was considered that the optimized condition of thermo-mechanical treatment enhanced growth of cube-oriented grains and suppressed the other grains. On the basis of the theory to bulge nucleation, the critical diameter of growth of cube-oriented grains was estimated. The estimated diameter was compared with the distribution of the measured diameter of cube-oriented grain. The result explained well the dependence of the area fraction of cube-oriented grains on foils with different conditions of thermo-mechanical treatment after final annealing.抄録全体を表示PDF形式でダウンロード (659K)
解説
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藤田 英一2003 年 53 巻 5 号 p. 224-230
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーPDF形式でダウンロード (522K)
連載講座
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川上 正博2003 年 53 巻 5 号 p. 231-237
発行日: 2003/05/30
公開日: 2021/06/30
ジャーナル フリーPDF形式でダウンロード (551K)
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