Al元素含量对汽车用Mg合金组织和性能的影响

Effect of Impurity Element Content on Microstructure and Property of 7075 Al Alloy

以Mg-Zn二元合金为研究对象,研究了Al含量变化对Mg合金物相、显微组织、显微硬度和拉伸强度的影响。结果表明,Al的加入使Mg合金中晶粒尺寸降低,存在金属间化物的生成,这些金属间化合物主要存在于晶界处。随Al含量增加,Mg合金的表面显微硬度增加,拉伸强度先增加后减小;当Al含量为1.0%时,Mg合金的拉伸强度达到最大值215MPa。

Taking Mg-Zn alloy as research object, the effects of AI content on the microstructure, microhardness and tensile strength of Mg alloy were studied. The results show that the addition of A1 decreases the size of grains in the Mg alloy. There are intermetallic compounds at the grain boundary. With the increase of A1 content, the microhardness of Mg alloy increases, the tensile strength decreases after first increases. When A1 content is 1.0%, the tensile strength of Mg alloy reaches the maximum value of 215 MPa.