Ti对Mg95.5Y3Cu1.5合金组织和力学性能的影响

Effects of Ti on Microstructure and Mechanical Properties of Mg95.5Y3Cu1.5 Alloy with Long Period Stacking Ordered Phase

向含LPSO结构相的Mg95.5Y3Cu1.5合金中添加Ti,主要考察Ti含量对合金凝固组织和力学性能的影响。结果表明,添加Ti能够显著细化合金中的初生α-Mg相。随着Ti含量增加,初生α-Mg相的晶粒尺寸呈先降低后增加的趋势。另外,合金的抗拉强度和伸长率均呈先提高后降低的趋势。当Ti含量为0.4%时(摩尔分数),合金的抗拉强度和伸长率均达到最大值,分别为168 MPa和6.4%,相比未添加Ti时提高了17.1%和39.6%。

The effects of Ti on the microstructure and mechanical properties of Mg95.5Y3Cu1.5 alloy with long period stacking ordered(LPSO) phase were investigated. The results reveal that the microstructure of alloys can be refined by Ti addition. The grain size of primary α-Mg phase in the alloys is decreased firstly and then increased with increasing in Ti contents. Meanwhile, the tensile strength and elongation of alloys are increased firstly and then decreased. With 0.4% Ti addition(in atomic fraction), the tensile strength and elongation of the alloy reach 168 MPa and 6.4%, increased by 17.1% and 39.6%, respectively, compared with those of the Mg95.5Y3Cu1.5 alloy.