Nanostructured Al-Zn-Mg-Cu alloy synthesized by cryomilling andspark plasma sintering
来源期刊：中国有色金属学报(英文版)2009年第5期
论文作者：陈汉宾 陶凯 杨滨 张济山
文章页码：1110 - 1115
Key words：cryomilling; spark plasma sintering; nanostructured Al-Zn-Mg-Cu alloy; microstructural evolution; second phase
Abstract: 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.
基金信息：the Hi-tech Research and Development Program of China
the Research Fund for the Doctoral Program of Higher Education, China
