巻号一覧
53 巻, 2 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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研究論文
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澤井 猛, 小川 恒一, 山口 博, 越智 秀, 山本 義秋, 菅 泰雄2003 年 53 巻 2 号 p. 43-49
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーIn this paper, the effect of the upset timing on joint strength of the friction welded joints of 6061 aluminum alloy was discussed by using the evaluation factors of the deformation heat input in the upset stage and the upset burn-off length. The results showed the followings. When the upset pressure was applied before the braking, the deformation heat input in the upset stage and the upset burn-off length were so large more that sound weld joints could be obtained easily, than that of the synchronized timing at the same welding parameters. In the synchronized timing, when the upset pressure was large, the actual pressure could not attain to a set up pressure. Meanwhile, when the upset pressure was applied after the braking, the deformation heat input in the upset stage and upset burn-off length were so small that sound weld joints could not obtained. Therefore, it was made clear by using effect of the upset timing in joint performance was much related with the deformation heat input and upset burn-off length. And the sound welded joints were obtained with 200 J/s or more deformation heat input and 2.5 mm or more upset burn-off length.抄録全体を表示PDF形式でダウンロード (413K) -
渡辺 博行, 向井 敏司, 鈴木 桂介, 清水 亨2003 年 53 巻 2 号 p. 50-54
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーThe influence of grain structure on the formability of an AZ31 magnesium alloy rolled sheet was examined by deep drawing for five materials. Each sheet was formed at a drawing speed of 60 mm/min into a cup, which had a square bottom of 50 × 50 mm2, and a maximum depth of 18 mm. It was found that the materials with grain sizes of ≤10 μm could be formed to the maximum depth without cracking, even at the lowest temperature investigated (423 K). Tensile mechanical testing of the rolled sheets revealed that these materials with high drawability also had a high Lankford value at the forming temperature. In addition, the surface roughness at the corners of the deep drawn cup was somewhat reduced in the fine–grained materials. The present results suggest that a magnesium alloy sheet with a fine–grain structure has the potential for deep drawing at relatively low temperatures.抄録全体を表示PDF形式でダウンロード (478K) -
江戸 正和, 黒田 周, 渡部 晶, 当摩 建2003 年 53 巻 2 号 p. 55-60
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーAluminum alloy three-layered brazing sheets, clad with sacrificial anode alloy on one side of them, have widely been used for the tube of radiators for automotive in which cooling water circulates. Inner pitting corrosion resistance of the tube has been excellent both in acidified and in neutral corrosive aqueous solutions by the effect of sacrificial anode. On the other hand, it has been reported that the sacrificial anode does not work effectively in alkaline solution, and perforation by pitting corrosion occurs in earlier testing period of time. In this report, localized corrosion characteristics in alkaline solution were investigated by immersion corrosion tests and electrochemical measurements. Based on the experimental results, new corrosion mechanism was proposed in terms of solution environment formed on cathode surface. Pitting corrosion of the core alloy grew not with the attack by the alkaline bulk solution, but with accelerated dissolution by strong alkaline solution derived from the electrochemical cell formation between sacrificial anode and cathodic core alloy. Corrosion products formed in the pit were effective for maintaining strong alkaline environment on the core alloy surface.抄録全体を表示PDF形式でダウンロード (487K) -
佐久間 尚幸, 小松原 俊雄2003 年 53 巻 2 号 p. 61-66
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーYield stress anisotropy in Al–Mg alloy sheets was studied from viewpoints of microstructure and arrangement of dislocation cell walls. The specimens were annealed for recovery after heavy cold rolling. Behavior of the anisotropy change with the annealing is strongly affected by the type of initial dislocation arrangement introduced by cold rolling. In the type of specimens having inhomogeneous deformation structures such as shear bands or deformation zones developed around coarse particles, both ΔYS0°–45° and ΔYS90°–45° decreased with an increase in annealing temperature where ΔYS0°–45° and ΔYS90°–45° are the difference in yield stresses between the specimens taken from the rolled sheets paralleled and 45° to the rolling direction and perpendicular and 45° to the rolling direction, respectively. Consequently the difference between the maximum and minimum yield stresses, ΔYS, decreased with the annealing. On the other hand, in the type of specimens having less inhomogeneous deformation structures, ΔYS0°–45° decreased with the annealing temperature. However, ΔYS90°–45° exhibited a tendency to increase. Therefore, a minimum ΔYS appeared at an annealing temperature.抄録全体を表示PDF形式でダウンロード (572K) -
篠嶋 妥, 市村 稔2003 年 53 巻 2 号 p. 67-73
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーThe isothermal dendrite growth process in an Al–Zn binary alloy was simulated using the phase-field method. It was clarified that the larger the super cooling was, the finer the dendrite structure became. In addition, the relationships between the growth velocity of the primary dendrite arm (V) and the dimensionless super cooling (Δ) and between the radius of the primary dendrite arm (d) and the dimensionless super cooling (Δ) were qualitatively clarified from a viewpoint of the scaling theory. A comparative study between the phase-field method and the dendrite growth theory was also performed by utilizing the previous data of the Al–Cu alloy and the present data of the Al–Zn alloy. The growth velocity of the primary dendrite arm (V) , the radius of the primary dendrite arm (R) and the solute distribution at a solid-liquid interface were determined and compared. The values showed that the agreement between the phase-field simulation and the dendrite growth theory was good if the shape of a dendrite tip was parabolic. In a region with large super cooling, where the growth mode changes from a dendrite to cell, the dendrite growth theory becomes invalid.抄録全体を表示PDF形式でダウンロード (437K)
研究ノート
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金谷 輝人, 榊原 精, 田代 勤2003 年 53 巻 2 号 p. 74-75
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 (259K)
解説：小山田記念賞
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安達 修平, 井上 厚, 岡庭 茂, 楠井 潤2003 年 53 巻 2 号 p. 76-81
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 (589K)
連載講座
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堀川 敬太郎, 菅野 幹宏2003 年 53 巻 2 号 p. 82-89
発行日: 2003/02/28
公開日: 2021/06/30
ジャーナル フリーPDF形式でダウンロード (484K)
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