摘要
在冷室压铸机上制备了Mg-6Gd-3Y-0.5Zr(GW63K)、Mg-8Gd-3Y-0.5Zr(GW83K)和Mg-6Gd-3Y-0.3Ca-0.5Zr(GWC630K)合金。通过光学显微镜、扫描电镜、X射线衍射及力学性能测试等研究了Ca、Gd对GW63K合金组织及力学性能的影响。结果表明:在GW63K合金基础上,添加Ca或Gd均可以使合金组织得到细化,并使得晶界上稀土相的数量明显增加。Ca主要溶于基体中,使合金中Gd、Y稀土元素更多地溶入基体,并使稀土相以短棒状或粒状分布于晶界。Gd主要分布于晶界上的稀土相中。Ca的加入有利于提高合金室温拉伸力学性能,而Gd的加入更有助于提高合金的高温强度。
The Mg-6Gd-3Y-0.5Zr （GW63K） , Mg-8Gd-3Y-0.5Zr （GW83K） and Mg-6Gd-3Y-0.3Ca- 0.5Zr （GWC630K） alloys were prepared by cold chamber die casting process. The effects of Ca, Gd on microstructure and mechanical properties of die casting Mg-6Gd-3Y-0.5Zr alloys have been investigated using OM, SEM, XRD and mechanical properties test. The results show that based on GW63K alloy the addition of Ca or Gd element may refine the alloy microstructure and increase amount of the rare earth phase at grain boundary. The Ca element dissolves mainly in the matrix, which makes Gd and Y rare earth elements in alloy dissolve more in the matrix, and changes morphology of rare earth phase form strip to rod-like or granule. The Gd element distributes mainly in the rare earth phase at grain boundary. The addition of Ca may help to increases the tensile property of alloys at room temperature; however, the addition of Gd contributes to the increase of the elevated temperature strength of alloy.
出处
《铸造》
CAS
CSCD
北大核心
2009年第10期1026-1029,共4页
Foundry
关键词
压铸镁合金
CA
GD
显微组织
力学性能
die casting magnesium alloy
Ca
Gd
microstructure
mechanical property
