軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
研究論文
Mg–重希土類元素–Zr合金の高温変形特性および鍛造性
鎌土 重晴北口 豊播磨 克忠小島 陽谷池 茂弘関伊 佐夫
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1998 年 48 巻 4 号 p. 168-173

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The aim of this study is to determine optimum forging conditions for Mg–Gd–Nd–Zr and Mg–Gd–Y–Zr alloys. Firstly, homogenization temperature of these alloys was altered at the solvus temperature, above and below that temperature to evaluate the effect of grain size and remained compound on high temperature deformation characteristics by conducting high temperature tensile and compression tests. Consequently, an increase in elongation is obtained in specimens with both a small amount of compound and a small grain size. However, the prevention of grain coarsening is found to be a more important factor for the increase in elongation of these specimens than the amount of compound. As a next step, these specimens controlled the grain size more than 65 μm were used for die forging into a piston shape under the conditions of a die speed of 0.36 to 0.41 m/s, a specimen temperature of 500°C and a mold temperature of 300°C. Applying these optimum forging conditions leads to the production of die-forged pistons with an excellent surface finish and without internal cracks.

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© 1998 一般社団法人 軽金属学会
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