Microstructural evolution during semisolid state strain induced melt activation process of aluminum 7075 alloy
The effects of compression ratio on the microstructure evolution of semisolid 7075 Al alloy produced by the strain induced melt activation (SIMA) process were investigated.The samples were cold deformed by compression into the different heights up to 40％ reduction.The isothermal holding treatments were carried out at 625 ℃ for predetermined time intervals.The results reveal that the average grain size is gradually reduced with the increase of the compression ratio.When the compression ratio surpasses 30％,the above descending trend is not as evident as that below 30％ reduction.During the subsequent heat treatments,the recrystallization is induced in the deformed samples by the increasingly accumulated strain energy.The grain growth mechanisms and the microstructural coarsening of the SIMA processed 7075 Al alloy were discussed and confirmed.
thixoforming thermomechanical processing aluminium alloys semi-solid metal
A.BOLOURI M.SHAHMIRI E.N.H.CHESHMEH
Department of Mechanical Engineering, Eastern Mediterranean University, Mersin 10, Turkey School of Material Engineering and Metallurgy, Iran University of Science and Technology, Tehran, 16
国际会议
北京
英文
1663-1671
2010-09-16（万方平台首次上网日期，不代表论文的发表时间）