Research on microstructure and mechanical properties of Al- 20Si alloy modified by friction stir processing
YANG Yong- jing1,HUA Peng1,LI Xian- fen1,ZHOU Wei1,2
1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 2. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
Abstract：Effect of multi- pass friction stir processing on microstructure and mechanical properties of as- cast Al- 20Si alloy was investigated. The results indicated friction stir processing cause great breakage of coarse primary Si particles and acicular eutectic Si particles. After friction stir processing, microhardness of Al- 20Si alloy decreased slightly, and the ultimate tensile strength and elongation of Al- 20Si alloy increased simultaneously, from 90. 8MPa and 0. 8% of as- cast to 202. 5MPa and 15. 8% of three- pass respectively.
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2018, Vol. 25 
