巻号一覧
54 巻, 7 号
選択された号の論文の6件中1～6を表示しています
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研究論文
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梶原 桂, 杉崎 康昭, 関 勇一2004 年 54 巻 7 号 p. 273-279
発行日: 2004年
公開日: 2007/02/20
ジャーナル フリーMicrostructure and precipitation control for optimizing processing conditions is vitally important for improvement of quality of wrought aluminum alloys. In this study, a model was presented for the precipitation behavior of impurity Fe and Si in commercial purity aluminum. The model was basically constructed under the nucleation and growth theory. The equilibrium stability and solvus temperature of precipitates and equilibrium solvus boundaries of Fe and Si in solid solution were determined by thermodynamic calculation for Al–Fe–Si alloys. The temperature–time-precipitation (TTP) curves for Al3Fe and α-AlFeSi were mainly described in this paper. In addition, as the effects of strain-induced precipitation, a stored energy term was added to the rate of heterogeneous nucleation, in which the effects of recovery and recrystallization were taken into account.
As an experimental verification of this model, the changes in solute Fe contents during isothermal annealing in the un-deformed and hot-deformed specimens were quantitatively investigated by chemical analysis of extracted residue with phenol (phenol residue method). The present model quantitatively explained the experimental results, in particular, concerning TTP curves and the accelerated precipitation due to strain.抄録全体を表示PDF形式でダウンロード (764K) -
高橋 知司, 松田 信之, 久保 周二, 日野 孝紀, 小松 正雄, 久幸 晃二2004 年 54 巻 7 号 p. 280-286
発行日: 2004年
公開日: 2007/02/20
ジャーナル フリーThe interdiffusion experiments of Ti-rich β Ti–Al–Cr alloys have been performed in the temperature range from 1273 to 1473 K. The concentration profiles indicate that the diffusion distance of Cr is somewhat longer than that of Al in the solid solutions. The diffusion paths show S-shaped curves. The formation of S-shaped diffusion paths is attributed to the difference between the diffusion distance of Cr and Al. The direct and indirect interdiffusion coefficients are positive in the ternary alloys, and the four interdiffusion coefficients are not sensitive to the solute concentrations. The ratio of indirect coefficient to direct one suggests that repulsive interactions exist between Al and Cr atoms in the Ti–Al–Cr alloys. In addition, the ratio values of converted interdiffusion coefficients in the ternary alloys suggest that the interactions between Ti (solvent) and Cr atoms are attractive in the present alloy.抄録全体を表示PDF形式でダウンロード (933K) -
金 英俊, 久保木 孝, 村田 眞2004 年 54 巻 7 号 p. 287-292
発行日: 2004年
公開日: 2007/02/20
ジャーナル フリーIncremental in-plane bending which has been invented by authors is a new and flexible manufacturing technology for small-lot production of sheet metal with various bending radii. The sheet metal is bent incrementally by an inclined-punch beating. The prototype incremental bending machine uses the numerical control technology and bends the sheet metal flexibly. The bending experiments are carried out and some experimental results such as beating force, bending radius, strain distribution are experimentally examined. The forming properties of in-plane bending are clarified in this study. Moreover, approximate formulas for calculating the bending radius are proposed base on the plane strain. The bending radius calculated by the proposed formula agrees with the one of the experiments.抄録全体を表示PDF形式でダウンロード (799K) -
渡辺 健彦, 杉山 善崇2004 年 54 巻 7 号 p. 293-297
発行日: 2004年
公開日: 2007/02/20
ジャーナル フリーIn this study, resistance spot welding was applied to make a dissimilar-metal joint between Mg alloy AZ31B plate and commercially pure Al plate. Factors affecting the cross tensile strength of the joint and the effect of Ag insert on the joint strength were investigated. The main results obtained in this study are as follows.
The strength of the dissimilar-metal joint of Mg/Al increased with increasing welding current, however, the strength was very low and was about one forth to one fifth that of the similar-metal joint of Mg/Mg made under the same condition.
By using insert metal consisting of four layers of Ag foil with 0.1 mm thickness, the strength of the Mg/Ag joint increased about 1.5 times than that of the Mg/Ag joint without the insert metal.
With increase in the thickness of the foil-layered Ag insert metal, the thickness of an intermetallic compound formed at the interface between Mg and Ag decreased and the thickness of a eutectic reaction layer between Ag and Al increased, resulting in the increase in the Mg/Al joint strength. However, when the insert metal of 5-layers Ag foil was used, the strength of the Mg/Ag joint decreased because non-bonded regions occurred in the eutectic reaction layer.抄録全体を表示PDF形式でダウンロード (1767K)
解説
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山縣 裕2004 年 54 巻 7 号 p. 298-301
発行日: 2004年
公開日: 2007/02/20
ジャーナル フリーPDF形式でダウンロード (1567K)
連載講座
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水越 秀雄2004 年 54 巻 7 号 p. 302-306
発行日: 2004/07/30
公開日: 2021/06/30
ジャーナル フリーPDF形式でダウンロード (5917K)
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