Isothermal coarsening of primary particles during rheocasting  

作　　者：郭洪民 罗学泉 章爱生 杨湘杰 

机构地区：[1]School of Materials Science and Engineering,Nanchang University [2]School of Mechatronic Engineering,Nanc hang University

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第8期1361-1366,共6页中国有色金属学报（英文版）

基　　金：Project (50804023) supported by the National Natural Science Foundation of China;Project (205084) supported by the Key Project of Science and Technology Research of Ministry of Education of China

摘　　要：The isothermal coarsening behavior of primary solid particles in A356 aluminum alloy semi-solid slurry produced by angular oscillation (AO) technique was investigated.The comparison between the calculation and experimental results shows good quantitative agreement with Lifshitz-Slyozov-Wagner theory.The results show that the variation in shape factor and solid fraction is not significant,the average particle size increases with increasing holding time at the expense of the particle density.Ostwald repining is most likely the predominant growth mechanism in the AO-treated semi-solid slurry during rheocasting.The differences of coarsening occurred in rheocasting and partial re-melting process were also discussed.The isothermal coarsening behavior of primary solid particles in A356 aluminum alloy semi-solid slurry produced by angular oscillation （AO） technique was investigated. The comparison between the calculation and experimental results shows good quantitative agreement with Lifshitz-Slyozov-Wagner theory. The results show that the variation in shape factor and solid fraction is not significant, the average particle size increases with increasing holding time at the expense of the particle density. Ostwald repining is most likely the predominant growth mechanism in the AO-treated semi-solid slurry during rheocasting. The differences of coarsening occurred in rheocasting and partial re-melting process were also discussed.

关 键 词：RHEOCASTING SEMI-SOLID COARSENING A356 alloy angular oscillation technique 

分 类 号：TG111.4[金属学及工艺—物理冶金]