MAGNESIUM ALLOY SHEET MATERIAL HAVING EXCELLENT FORMABILITY, AND METHOD FOR PRODUCTION THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a magnesium alloy rolled sheet material having satisfactory formability at a relatively low temperature (from room temperature to 150°C).;SOLUTION: In the magnesium alloy sheet material, the maximum integration degree at the bottom face is 10, and also, the average crystal grain size is ≤20 μm. The production of the sheet material is performed in such a manner that a magnesium alloy sheet material having the average crystal grain size of ≥15 μm is rolled at a draft of 2 to 15% by cold rolling at a peripheral speed ratio of 1.0 to 1.15, or is rolled at a draft of 10 to 30% by warm different peripheral speed rolling at a circumferential speed ratio of 1.05 to 1.6, is thereafter heat-treated at ≥400°C for ≥10 min, is further subjected to working at 5 to 40% by cold rolling, and is thereafter heat-treated at 200 to 350°C for 5 to 120 min.;COPYRIGHT: (C)2011,JPO&INPIT