文献类型：期刊文献

英文题名：Alloy development and reheating process exploration of Al-Si casting alloys with globular grains for thixoforming

作者：Wang, Jiao Jiao[1];Zhang, Zhong Min[2];Phillion, A. B.[3];Shang, Shu Zhen[1];Lu, Gui Min[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Junsoft Digital Sci & Technol Co Ltd, Dept Res & Dev, Shanghai 200051, Peoples R China;[3]McMaster Univ, Mat Sci & Engn, Hamilton, ON L8S 4L7, Canada

年份：2016

卷号：31

期号：16

起止页码：2482

外文期刊名：JOURNAL OF MATERIALS RESEARCH

收录：;EI(收录号：20161902344387);WOS:【SCI-EXPANDED(收录号:WOS:000382972800014)】；

基金：This work is funded by the National Natural Science Foundation Project of China (51374109). The authors would like to thank to Analyst Shou Peng Xie in Shanghai Lian He Credit Information Service Co., Ltd for his assistance in statistical analysis and helpful discussions.

语种：英文

外文关键词：Aluminum alloys - Industrial heating - Silicon alloys - Morphology - Rate constants

摘要：A novel two-stage reheating process with new alloy design has been developed to improve the microstructure morphology of semisolid Al-Si casting aluminum alloy for thixoforming. The process consists of first reheating the material to the liquidus temperature, holding for 5 min, and then lowering to the predetermined two-stage reheating temperature between 843-863 K and holding for 10 min. The experimentally-obtained grain diameter, roundness, and the amount of liquid trapped within the solid phase were characterized, along with the microstructure obtained using the traditional feedstock reheating process. The Wilcox test (with alpha = 0.05) was then applied to statistically analyze the measured differences in the microstructures obtained using the two different processing routes. It was found that a refined near-spherical structure with uniform globule size, higher sphericity, lower coarsening rate constant, and less entrapped liquid was obtained via the new two-stage reheating process in comparison with the microstructure obtained using the traditional feedstock reheating process.