Magnesium alloy sheet and method for producing same

摘要

The magnesium alloy sheet disclosed herein has dispersed therein particles of an intermetallic compound containing an additive element (e.g., Al) and Mg (a typical example of which is Mg17Al12), and the ratio obtained by dividing the diffraction intensity of the main diffraction plane (4,1,1) of the intermetallic compound by the diffraction intensity of the c plane (0,0,2) of the Mg alloy phase in an XRD analysis of the surface of the sheet is 0.040 or more. The method includes: a casting step of producing a cast material composed of a magnesium alloy containing an additive element by continuous casting; a heat treatment step of holding the cast material at 400° C. or higher and then cooling the cast material at a cooling rate of 30° C/min or less to produce a heat-treated material; and a rolling step of subjecting the heat-treated material to warm rolling to produce a rolled sheet.

主权项

1. A magnesium alloy sheet comprising:
a magnesium alloy containing 8.3% to 9.5% by mass of Al as an additive element, wherein: the sheet has dispersed therein particles of an intermetallic compound containing the additive element and Mg, the ratio obtained by dividing the diffraction intensity of the main diffraction plane (4,1,1) of the intermetallic compound by the diffraction intensity of the c plane (0,0,2) of the Mg alloy phase in an XRD analysis of the surface of the sheet is 0.055 or more, particles of the intermetallic compound include spherical particles with an aspect ratio of less than 2, and rod-like particles with an aspect ratio of 2 or more.