摘要
在ZM5合金熔体中分别加入不同量的稀土元素钇（Y），利用光学显微镜和扫描电镜以及能谱分析，研究了稀土元素钇（Y）对ZM5合金腐蚀性能的影响。结果表明，向ZM5合金中添加稀土元素钇（Y）的质量分数达2％时，合金的抗腐蚀性能明显改善。X衍射和金相照片显示ZM5合金组织为α-Mg固溶体和沿晶界分布的网状β-Mg17Al12组成，而加入稀土元素钇（Y）的ZM5合金由α-Mg、Mg17Al12、颗粒状MgY等相组成。经固溶处理后网状Mg17Al12相完全溶解，只留下热稳定较高的MgY以及析出相Al2Y等。其原因是加入稀土元素钇（Y）后，生成了与镁基体共格的强化相MgY和弥散的析出相Al2Y，改变ZM5合金的综合性能。
Yttrium is added into cost Mg-8.5%Al-0.5%Zn alloy with different proportion. The microstructure was optimized and the strength, the erosive velocity and toughness were studied. The results show that Yttrium has a much better refining effect observed and could much change the erosive velocity of ZM5 alloys. The microstructure of Mg-8.5%Al-0.5%Zn consists of α-Mg solid solution and net-like and/or Mg17Al12 phase. But the microstructures of the alloys which was added rare earth Y consists α-Mg solid solution, net-like Mg17Al12, MgY and so on. After the solid solution treatment, the Mg17Al12 almost dissolved in Mg matrix, but the rare earth compounds MgY phase did not dissolved, their morphology was slightly changed and at the same time, the new phase such asAl2Y could found all of which change the erosive properties of ZM5 alloys.
出处
《铸造工程》
2007年第1期37-40,共4页
Foundry Engineering
基金
江西省材料科学与工程研究中心开放基金（ZX200401003）
关键词
稀土
钇元素
ZM5合金
固溶处理
腐蚀
Rare earth
Yttrium
ZM5 alloy
Solid-solution treatment
Erosive
