Sn元素含量对汽车用Mg合金组织和性能的影响

Effect of Sn content on the structure and property of Mg alloy

以Mg-4%Zn-5%Al合金为研究对象,研究Sn含量变化对Mg合金物相、显微组织和拉伸性能的影响。采用XRD对样品进行物相的测定,并测试了不同Sn含量的样品的抗拉强度。结果表明,Sn的加入使Mg合金在晶界处生成共晶相,随着Sn含量增加,Mg合金抗拉强度和伸长率先增加后减小。当Sn含量为1.0%时,Mg合金抗拉强度达到最大值226.5 MPa,而未添加Sn时的Mg合金抗拉强度为189.2 MPa,此时Mg合金的伸长率为9.1%;当Sn含量继续增加时,Mg合金的抗拉强度和伸长率将下降。

For the Mg- 4% Zn- 5% Al alloy, the effects of varying Sn contents on the phase, microstructure and tensile property of the Mg alloy were studied. XRD was used to measure phase of samples and to test tensile strength of samples with different Sn contents. The results show that the addition of Sn forms eutectic at the grain boundary in the Mg alloy. With the increase of Sn contents, tensile strength and elongation of the alloy first increase and then decrease. When Sn content is 1. 0% , the tensile strength of Mg alloy reaches the maximum of 226. 5 MPa, which is higher than 189. 2 MPa when the Mg alloy is without Sn, and the corresponding elongation is 9. 1%. Increasing Sn content further, the tensile strength and elongation of Mg alloy will decrease.