SOLUTION-TREATED MAGNESIUM ALLOY MATERIAL AND METHOD FOR PRODUCING THE SAME

To provide an aging treated magnesium alloy material that is a sheet made from inexpensive alloy elements without using expensive rare earth metals, which undergoes a combination of simple heat treatments, including solution treatment, subsequently molding, and further aging treatment for enhanced strength, and a method for producing the same.SOLUTION: This aging treated magnesium alloy material contains 0.3 mass% to 1 mass% (inclusive), preferably 0.3 mass% to 0.7 mass% (inclusive), more preferably 0.3 mass% to 0.55 mass% (inclusive) of Ca, and one or more alloy elements selected from at least among 0.5 mass% or more but less than 3.5 mass% of Zn and 0.1 mass% or more but less than 3 mass% of Al, with the balance being made up of Mg and unavoidable impurities. This aging treated magnesium alloy material has bake hardenability; the magnesium alloy has a 0.2% proof stress of 150 MPa or more; and precipitates that are composed of Mg, Ca and Al are dispersed on the (0001) plane of the magnesium matrix.SELECTED DRAWING: Figure 39 【課題】高価な希土類金属を含まない安価な合金元素よりなる板材で、単純な熱処理の組み合わせにより、溶体化処理後に成形加工し、さらに時効処理によって強度を向上させるマグネシウム合金時効処理材とその製造方法を提供する。【解決手段】マグネシウム合金時効処理材は、０．３質量％以上１質量％以下、好ましくは０．３質量％以上０．７質量％以下、より好ましくは０．３質量％以上０．５５質量％以下のＣａと、少なくとも０．５質量％以上３．５質量％未満のＺｎ、０．１質量％以上３質量％未満のＡｌから選ばれる１種以上の合金元素と、を含有し、残部がＭｇ及び不可避不純物からなり、焼付硬化性を有し、かつ、マグネシウム合金の０．２％耐力が、１５０ＭＰａ以上であり、Ｍｇ、Ｃａ及びＡｌよりなる析出物がマグネシウム母相の（０００１）面上に分散している。【選択図】図３９