MAGNESIUM ALLOY MEMBER

摘要

A magnesium alloy structural member includes a base material composed of a magnesium alloy having an aluminum content of 4.5% by mass to 11% by mass, in which the base material has a pair of first and second surfaces, the first surface and the second surface being opposite each other, in which when a distance between the first surface and the second surface is defined as a thickness and when surface area regions are defined as regions extending from the first and second surfaces to positions 20 µm from the respective first and second surfaces in the thickness direction, in at least both the surface area regions, 10 or more fine precipitates are present in any 20 µm × 20 µm subregion of each of the surface area regions, each of the fine precipitates containing both Mg and Al and having a greatest dimension of 0.5 µm to 3 µm. Because at least each of the surface area regions is composed of a microscopic texture in which fine precipitates are dispersed, the magnesium alloy structural member has excellent corrosion resistance without anticorrosion treatment and can be used for housings and so forth.