MAGNESIUM ALLOY SHEET AND PROCESS FOR PRODUCING SAME

摘要

Provided are a magnesium alloy sheet having excellent corrosion resistance and a process for producing the sheet. The magnesium alloy sheet contains, dispersed therein, particles of an intermetallic compound comprising an additive element (e.g., Al) and Mg (representative example, Mg17Al12), and has a surface in which in XRD analysis, the ratio obtained by dividing the diffraction intensity for the main diffraction plane (4,1,1) of the intermetallic compound by the diffraction intensity for the c plane (0,0,2) of the Mg alloy phase is 0.040 or more. The process for producing the magnesium alloy sheet comprises the following steps: a casting step in which a cast material comprising a magnesium alloy containing an additive element is produced by continuous casting; a heat treatment step in which the cast material is held at 400ºC or higher and then cooled at a cooling rate of 30 ºC/min or less to produce a heat-treated material; and a rolling step in which the heat-treated material is warm-rolled to produce a rolled sheet.