巻号一覧
30 巻, 6 号
選択された号の論文の8件中1～8を表示しています
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川村 知1980 年 30 巻 6 号 p. 299-300
発行日: 1980/06/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (374K) -
矢野 哲夫, 柳沢 平, 丸山 益輝1980 年 30 巻 6 号 p. 301-308
発行日: 1980/06/30
公開日: 2008/07/23
ジャーナル フリーTensile tests on the Al-Al3Ni eutectic composites unidirectionally solidified having cellular structure were carried out at room temperature. The 0.2% proof stress and the ultimate tensile strength decrease and the elongation increases with greater θ, an angle between the directions of tensile stress and, Al3Ni fiber alignment. Fracture behaviors are classified into two different modes according to the value of the angle θ. When θ is less than about 20°, fracture of the composites is caused by failure of fibers in cells. When θ is about 20° or more, fracture progresses parallel to the fibers and the cellular axis in Al-matrix. Theoretical equations of the proof stress and ultimate strength relating to θ are respectively proposed and verified by the experimental results.抄録全体を表示PDF形式でダウンロード (1860K) -
佐藤 金司1980 年 30 巻 6 号 p. 309-316
発行日: 1980/06/30
公開日: 2008/07/23
ジャーナル フリーInner surface burnishing of A2B1, A2B2 and A2B5 alloys were studied. Analysis of the press-in force required for the tool was carried out. Steady state of the press-in force is found under such conditions as thin wall thickness of the alloy tubes, slow press-in speed of the tool, and longer tube length. An amount of material to be removed has a remarkable effect on the deformation process. A smaller amount of material to be removed ensures better shape precision of the burnished tube. All over the section of the tube is appreciably work-hardened. Workhardening is heavy at the inner side contacting with the tool and moderates toward the outer side.抄録全体を表示PDF形式でダウンロード (1907K) -
品田 与志栄, 西 成基1980 年 30 巻 6 号 p. 317-323
発行日: 1980/06/30
公開日: 2008/07/23
ジャーナル フリーAluminum containing hydrogen less than the critical concentration for pore formation was unidirectionally solidified. Solidified aluminum contains a constant amount of hydrogen defined by freezing rate. Excessive hydrogen is rejected at the solid-liquid interface. Hydrogen in the liquid near the freezing interface is concentrated. Its distribution is represented according to a model in which solute mixing in the liquid is diffusion controlled:
CL=C0+(C0-CS)R/DLhx=hexp{-(x-h)R/DL}(x>h)
When the hydrogen concentration at the interface reaches 0.77 to 0.79cc/100g, gas pores are formed at the interface and grow as a pipe shaped pore. The hydrogen distribution in solidifying aluminum is constant untill gas pores are formed and trapped at the interface. The hydrogen content increases and the density decreases after trapping pores.抄録全体を表示PDF形式でダウンロード (1271K) -
ダン グェンコン, 村上 雄, 高橋 恒夫1980 年 30 巻 6 号 p. 324-329
発行日: 1980/06/30
公開日: 2008/07/23
ジャーナル フリーC-curves for beginning of precipitation of Al6Mn and start and end of recrystallization were determined by use of optical and electron microscopies and of Vickers hardness measurement. Recrystallization textures were represented by X-ray pole figures. Three types interrelations between precipitation and recrystallization processes are found in different temperature ranges: 1) Precipitation precedes recrystallization at T<320°C; 2) Precipitation starts after recrystallization has occurred at 320°C_??_T_??_400°C; and 3) recrystallization completes before precipitation occurs at T>400°C. The rolling texture remains in the alloys annealed at T<380°C through recrystallization in situ. Discontinuous recrystallization becomes preferentially at elevated temperature 380°C_??_T_??_400°C and the texture is composed of R-orientation and a weak cube texture. Annealing at T>400°C results in formation of the (001) [100] and (011) [100] orientations. These orientations are related to the deformed matrix by 40° <111> rotational relationships.抄録全体を表示PDF形式でダウンロード (1300K) -
小松 伸也, 中田 吉信, 杉本 隆史, 亀井 清1980 年 30 巻 6 号 p. 330-336
発行日: 1980/06/30
公開日: 2008/07/23
ジャーナル フリーA method for measuring specific resistivity after rolling was developed. Behaviors of dislocations, G.P. zones and transition phases in the high-purity Al-4.0 at%MgZn2 alloy thermomechanically treated were investigated. Dislocations ca. 1011/cm2 in density are introduced during cold rolling by 30% independently of pre-treatments. Room temperature aging may be initially accelerated in the alloy cold rolled immediately after quenching and is soon retarded. The final aging rate at 120°C is accelerated by cold rolling regardless of pre-treatments. Softening occurs at the start of final aging of the no pre-aging specimen probably due to recovery of cold rolled structures. Pre-aging at elevated tempera ture results in G.P. zones more stable and in an intensified accelerating effect of cold rolling on final aging. Resis-tivity and hardness after final aging of the alloy not rolled are increased by pre-aging. The increments are free from the change of pre-aging temperature.抄録全体を表示PDF形式でダウンロード (991K) -
伊藤 邦夫1980 年 30 巻 6 号 p. 337-348
発行日: 1980/06/30
公開日: 2008/07/23
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小林 啓行, 斉藤 勝義1980 年 30 巻 6 号 p. 349-360
発行日: 1980/06/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (2408K)
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