Nanostructured Al-Zn-Mg-Cu alloy synthesized by cryomilling and spark plasma sintering  

作　　者：陈汉宾 陶凯 杨滨 张济山 

机构地区：[1]No.59 Institute of China Ordnance Industry [2]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing

出　　处：《中国有色金属学会会刊：英文版》2009年第5期1110-1115,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(2002AA302502)supported by the Hi-tech Research and Development Program of China;Project(20050008016)supported by the Research Fund for the Doctoral Program of Higher Education,China

摘　　要：Nanocrystallized Al-10.0%Zn-3.0%Mg-1.8%Cu(mass fraction)alloy powder was prepared by cryomilling,and then the nanostructured powder was consolidated into bulk material by spark plasma sintering(SPS).The microstructural evolution and phase transformation were studied.A supersaturated face-centered cubic solid solution is formed after cryomilling for 10 h,and the average grain size is 28 nm.Two typical nanostructures of the bulk nanostructured alloy are observed:primarily equiaxed grains with size of 150 nm,and occasionally occurring sub-micron grains up to 500 nm.Two types of MgZn2 particles precipitate during consolidation. One is the sub-micron particles distributed along the boundaries of the powders,and the other is fine particles with size of several nanometers in the matrix,especially at the boundaries of sub-micron grains.These second phase particles can be completely dissolved into matrix by proper solid solution treatment.Nanocrystallized Al-10.0%Zn-3.0%Mg-1.8%Cu （mass fraction） alloy powder was prepared by cryomilling, and then the nanostructured powder was consolidated into bulk material by spark plasma sintering （SPS）. The microstructural evolution and phase transfonnation were studied. A supersaturated face-centered cubic solid solution is formed after cryomilling for 10 h, and the average grain size is 28 nm. Two typical nanostructures of the bulk nanostructured alloy are observed： primarily equiaxed grains with size of 150 nm, and occasionally occurring sub-micron grains up to 500 nm. Two types of MgZn2 particles precipitate during consolidation. One is the sub-micron particles distributed along the boundaries of the powders, and the other is fine particles with size of several nanometers in the matrix, especially at the boundaries of sub-micron grains. These second phase particles can be completely dissolved into matrix by proper solid solution treatment.

关 键 词：放电等离子烧结 铜合金 亚微米颗粒 亚微米粒子 合成 纳米粉体材料 镁 锌 

分 类 号：TG146.21[一般工业技术—材料科学与工程]