Magnesium alloy material

摘要

A magnesium alloy material having excellent impact resistance is provided. The magnesium alloy material is composed of a magnesium alloy that contains more than 7.5% by mass of Al and has a Charpy impact value of 30 J/cm2 or more. Typically, the magnesium alloy material has an elongation of 10% or more at a tension speed of 10 m/s in a high-speed tensile test. The magnesium alloy is composed of a precipitate, typically made of an intermetallic compound containing at least one of Al and Mg, and contains particles having an average particle size of 0.05 μM or more and 1 μm or less dispersed therein. The total area of the particles accounts for 1% by area or more and 20% by area or less. The magnesium alloy material containing fine precipitate particles dispersed therein has high impact absorption capacity through dispersion strengthening and has excellent impact resistance.

主权项

1. A magnesium alloy structural member comprising:
a substrate including a magnesium alloy material comprising a magnesium alloy that contains 8.3% to 9.5% by mass of Al, wherein the magnesium alloy material has a Charpy impact value of 30 J/cm2 or more; and an anticorrosive layer having a two-layer structure that includes a lower sublayer adjacent to the magnesium alloy material and a surface sublayer formed on the lower sublayer, wherein the surface sublayer is denser than the lower sublayer, and the lower sublayer is a porous layer.