4GPa超高压凝固Mg-6Zn-3Y合金的凝固组织及相分析  

Solidification Microstructure and Phase Analysis of Mg-6Zn-3Y Alloy under High Pressure of 4 GPa

作　　者：林小娉[1] 董允[1] 徐瑞[2] 陈建超[1] 赵鑫[2] 马晓斌[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]燕山大学材料科学与工程学院,河北秦皇岛066004

出　　处：《中国稀土学报》2011年第6期661-667,共7页Journal of the Chinese Society of Rare Earths

基　　金：河北省自然科学基金(E2010001398)资助

摘　　要：利用X射线衍射仪、扫描电镜并配合能谱分析研究了Mg-6Zn-3Y合金4 GPa超高压凝固组织。结果表明:在4 GPa超高压条件下凝固时,实验合金的凝固组织得到显著细化,基体α-Mg相的晶格间距有所减小;Zn在基体α-Mg中溶解度大幅提高,Y不溶于基体α-Mg;实验合金凝固组织中出现呈对称性的四瓣或六瓣花的初晶Y固溶体,该初晶花瓣形貌完整、尺寸较大,显示其充分自由生长;先发生的共晶反应的共晶组织为成"簇"分布的共晶团,共晶相呈点状或棒状;后发生的共晶反应的组织为离异共晶。超高压凝固显著地改变了实验合金的凝固过程。The microstructure of Mg-6Zn-3Y alloy so- lidified under 4 GPa high pressure was investigated by X-ray diffraction （XRD） , scanning electron microscopy （SEM） and energy disperse spectroscopy （EDS）. The results showed that the solidification microstructure of alloy was refined significantly and the lattice spacing of ct-Mg phase also was reduced under 4 GPa high pressure solidification condition. The solubility of Zn in cx-Mg matrix increased greatly, while Y did not dissolve in the matrix. The primary crystal （Y solidification） appeared like a symmetrical flower with four or six petals in the solidification microstructure, and these integrated and large petals indicated its completely free growth. The organization of the eutectic reaction which occurs firstly, was a ＂cluster＂ distribution of eutectic cell, and the eutectic phase was points-like or bars-like. The eutectic reaction occurred latter was divorced eutectic reaction. tested alloy＇s the solidification process would which So the happen to change under high pressure.

关 键 词：超高压凝固 微观组织 富Y花瓣相 共晶形貌 稀土 

分 类 号：TG113.12[金属学及工艺—物理冶金] TG146.2[金属学及工艺—金属学]