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.
The microstructures of the Mg65Cu25Y10 alloy solidified under pressures of 2--5 GPa and ambient pressure have been investigated by X-ray diffraction, differential scanning calorimetry and transmission electron microscopy. Experimental results show that the pressure has a great influence on the phase microstructure during solidification process. High pressure leads to the favorable precipitation of nanoscale Cu2(Y, Mg) phase, which is a metastable phase and transforms to stable Mg2(Cu, Y) phase after annealing. The mechanism for the effect of the pressure on the grain size during solidification process of Mg65Cu25Y10 alloy has been discussed.
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