Jia ZHANG
,
Keqiang QIU
,
Aimin WANG
,
Haifeng ZHANG
,
Mingxiu QUAN
,
Zhuangqi HU
材料科学技术（英）
The Mg65Cu25Y10 melts were quenched at a temperature of 973 K under various pressures in the range of 2～5 GPa and ambient pressure. The microstructure of the solidified specimens has been investigated by X-ray diffraction, transmission electron microscope and electron probe microanalysis. Experimental results show that the pressure has a great influence on the solidification microstructure of the Mg65Cu25Y10. At ambient pressure, the solidification products are Mg2(Cu,Y) and a very small amount of Y2O3 inclusion. As the pressure is above 2 GPa, a new Cu2(Y,Mg) phase appears, while Y2O3 is not observed at the pressure of 3, 4 and 5 GPa. When the pressure increases from 2 GPa to 5 GPa, the grain sizes of Mg2(Cu,Y) and Cu2(Y,Mg) decrease from 125, 96 nm to 80, 7 nm, respectively. The mechanisms for the effects of the pressure on the phase evolution and microstructure during solidification process of Mg65Cu25Y10 alloy have been discussed.
关键词:
Mg65Cu25Y10 alloy
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null
,
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张甲
,
张海峰
,
董盼
,
全明秀
,
胡壮麒
金属学报
采用X射线衍射、差热分析及透射电镜研究了Mg65Cu25Y10合金熔体在大气压下和高压(2--5 GPa)下熔淬时的组织结构. 实验结果表明, 压力对Mg65Cu25Y10合金凝固时形成的相结构有影响. 高压下有利于生成纳米级Cu2(Y, Mg)相. Cu2(Y, Mg)为一亚稳相, 高温退火后转变为稳定的Mg2(Cu, Y)相. 讨论了压力对晶粒度影响的机制.
关键词:
Mg65Cu25Y10合金
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pressure
,
grain size
