高压下Mg_(65)Cu_(25)Y_(10)合金凝固过程中Cu_2(Y,Mg)纳米相的形成及其热稳定性  

FORMATION AND THERMAL STABILITY OF NANOSCALE Cu_2(Y, Mg) DURING THE SOLIDIFICATION OF Mg_(65)Cu25Y_(10) ALLOY UNDER HIGH PRESSURE CONDITION

作　　者：张甲[1] 张海峰[1] 董盼[1] 全明秀[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2004年第2期211-214,共4页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展规划G2000067201;国家自然科学基金50071060和50274064

摘　　要：采用X射线衍射、差热分析及透射电镜研究了Mg_(65)Cu_(25)Y_(10)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Mg_(65)Cu_(25)Y_(10)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Cu_2(Y,Mg)相。Cu_2(Y,Mg)为一亚稳相,高温退火后转变为稳定的Mg_2(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 Cu-2(Y, Mg) phase, which is a metastable phase and transforms to stable Mg-2(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.

关 键 词：Mg65Cu25Y10合金 凝固过程 压力 晶粒度 纳米相 热稳定性 组织结构 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG111.4[金属学及工艺—合金]