| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for swiftly and stably producing a magnesium alloy thin sheet having a uniform and fine crystal grain structure with the average grain diameter of≤5μm at low material and production costs. SOLUTION: The method for producing a magnesium alloy thin sheet is characterized in that the molten metal of a magnesium alloy comprising, by mass, 1.0 to 11% Al,≤2.0% Zn and 0.1 to 0.5% Mn, and the balance Mg with inevitable impurities is subjected to continuous casting/rolling S<SB>1</SB>, so as to be a beltlike sheet, and is thereafter subjected to homogenizing treatment S<SB>2</SB>, hot rolling S<SB>3</SB>and process annealing S<SB>4</SB>in this order, or is subjected to hot rolling S<SB>5</SB>and homogenizing treatment S<SB>6</SB>in this order, subsequently, warm peripheral speed rolling S<SB>7</SB>is performed under the conditions where material heating temperature is controlled to the range of 200 to 280°C, rolling roll surface temperature is controlled to the range of <180°C and the rotary peripheral speed ratio of the upper and lower rolls is 1.1 to 1.6, and thereafter, final annealing S<SB>8</SB>is performed in the temperature range of 250 to 320°C for≤1 hr. COPYRIGHT: (C)2008,JPO&INPIT
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