Fabrication of Mg-Zn-Y-based quasicrystal alloys via different cooling media
Mg-Zn-Y quasicrystal (QC) alloys were fabricated via different cooling media. Effects of different cooling rates on QC morphology, size, volume fraction and microhardness were studied. Multicomponent Mg-Zn-Y-based QC alloys were synthesized based on amorphous design principle. QC morphology transformation and its influencing factors were analysized. Micro/nano spherical quasicrystals (QCs) were fabricated through a wedge-shaped copper mould and their forming mechanism was discussed by atoms cluster theory, optimum cooling rate theroy and the known crucial criteria. The research results show that with the cooling rate reduced, the solidified morphology of QC phases changes from near-spherical, micro petals (1-2 urn) to big petals (20 urn) and finally grows up to bulk pentagon or hexagon (200-400 urn). Multicomponent micro spherical QCs possess higher value of microhardness than the same components petal-like QCs, and also higher than ternary micro Mg-Zn-Y QCs. The fine master alloys containing micro QCs (0.4 urn) and nano-QCs (-300 nm and -40 nm) were fabricated correspondingly on middle and tip of wedge-shaped castings. A morphology evolutive schematic diagram of Mg-Zn-Y-based QCs is opened in this paper. Prospects of nano-QCs were analysized.
quasicrystals cooling media magnesium alloy Mg-Zn-Y-based alloys
Wang Zhifeng Zhao Weimin Hur Bo-Young Cui Yan
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China School of Nano and Advanced Materials Engineering, Gyeongsang National University, Jinju 660-701, Ko
国际会议
The 11th Asian Foundry Congress(第11届亚洲铸造会议 AFC-11)
广州
英文
1-8
2011-11-12（万方平台首次上网日期，不代表论文的发表时间）