| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnesium alloy sheet material having good formability even in a low temperature zone from room temperature to ≤150°C. Ž<P>SOLUTION: In the magnesium alloy sheet material, the degree of the maximum accumulation at the bottom part is <10 and an r-value is 1.0-1.6. This magnesium alloy sheet material is obtained, by subjecting the base plate of the magnesium alloy sheet material to a heat-treatment at ≥450°C for ≥0.5 hr, then subjecting the base plate of the magnesium alloy sheet material to cold-rolling at circumferential speed ratio of 1.0-1.3 and rolling-reduction ratio of 2-10% (no heating to the material and roll), or to warm different circumferential speed rolling of 10-30% under condition of circumferential speed ratio of 1.05-1.6, the roll temperature of room temperature to 250°C, and material heating temperature of 180-300°C, and then, subjecting the base plate of the magnesium alloy sheet material to heat treatment of ≥380°C for ≥5sec. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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