| 摘要 |
PROBLEM TO BE SOLVED: To make the formability and tensile strength of the member excellent, furthermore to secure large elongation and to improve its high speed deformation characteristic by regulating the solid phase ratio, aluminum content and strain rate in the formed member to specified ranges. SOLUTION: This magnesium alloy formed member has a solid phase ratio of >0 to 60%, an aluminum content of 2.0 to 6.5 wt.% and excellent high speed deformation characteristics of >=100/s strain rate. Preferably, its local inside defact rate is controlled to <=1%, and moreover, its total inside defect rate is controlled to <=1%. Preferably, the aluminum content is controlled to 3.0 to 6.5 wt.%, the solid phase rate is controlled to >0 to 40%, and a cast surface is allowed to remain in the part having high speed deformation characteristics. In this way, the defect part is made easy to be generated in the center part to the Mg alloy formed member in which the influence of the surface defect part to the high speed deformation characteristics is remarkable, but, by the remaining of the skin, the defect part is not exposed to the surface of the member.
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