摘要
通过光学金相观察(OM)、扫描电镜观察(SEM)、X-射线衍射分析(XRD)和拉伸试验研究了Gd和Y含量对Mg-Gd-Y-0.5Zr合金显微组织和力学性能的影响。结果表明:随着Gd含量的增加,Mg-Gd-Y-0.5Zr合金的抗拉强度逐渐增大,伸长率逐渐降低。随着Y含量的增加,合金的抗拉强度和伸长率均是先增大后减小。当Gd含量为9%、Y含量为3%时,综合性能最好,抗拉强度达到330-350MPa,仲长率为6%。由于Gd和Y在化合物中相互置换,致使该系列合金的室温非平衡相组成为α(Mg)固溶体、离异共晶化合物Mg,(Y,Gd)、颗粒化合物Mg,(Gd,Y)和Mg。(Y,Gd)5,非平衡结晶的颗粒化合物Mg3(Gd,Y)和Mg2(Y,Gd);
The effect of Gd and Y content on microsturcture and tensile properties of Mg-Gd-Y-0.5Zr Alloy by OM, SEM and XRD was studied. The results show that the tensile strength of GWxy alloys increases gradually and the elongation reduces gradually with Gd content increasing. With Y content increasing, however, the tensile strength and elongation of GWxy alloys increase first, then reduces. When Gd content is 9%, Y content is 3% (i.e. GW93 alloy), the comprehensive properties is the best in the GWxy alloys. The tensile strength of GW93 alloy at as-cast state is 330-350 MPa and elongation is 6%. Moreover, because there is replacement between Gd and Y, oL(Mg) solid solution, divorced eutectic compound Mgs(Y, Gd), particle Mgs(Gd, Y ) or Mg24 (Y, Gd)5, non-equilibrium crystallization phase Mg3 (Gd,Y) or Mg2 (Y, Gd) will simultaneously exist in Mg-Gd-Y-0.5Zr alloy at room temperature.
出处
《铸造》
CAS
CSCD
北大核心
2013年第6期545-548,553,共5页
Foundry
基金
国家重点基础研究发展计划资助项目(2012CB619606)