简介概要

Dynamic softening and microstructural evolution during hot deformation of Al-Cu-Mg-Zr alloys with different homogenization cooling rates

来源期刊:Rare Metals2021年第3期

论文作者:Guo-Wei Bo Guan Wang Fu-Lin Jiang Can Liu Rong Chen Hui Zhang

文章页码:626 - 634

摘    要:An Al-Cu-Mg-Zr alloy,which obtained different homogenization cooling rates by changing the heattreated sample size,was compressed to various strains at the deformation temperature of 300℃ and strain rate of0.01 s-1.The results showed that the homogenization cooling rate had strong effects on the hot deformation behavior of the alloy.The flow stress and relative dynamic softening rate of the alloy were significantly higher under a high cooling rate(HCR) than those under a low cooling rate(LCR).Furthermore,based on X-ray diffraction,scanning electron microscopy,transmission electron microscopy,and thermodynamic equilibrium phase calculation,the substructure evolution in the grain interior,morphology,and spatial distribution of the precipitates were studied to determine the differences in the flow softening mechanism.The main softening mechanism could be summarized as dynamic recovery and precipitation coarsening for the LCR alloy and dynamic precipitation for the HCR alloy.

详情信息展示

Dynamic softening and microstructural evolution during hot deformation of Al-Cu-Mg-Zr alloys with different homogenization cooling rates

Guo-Wei Bo1,Guan Wang2,Fu-Lin Jiang1,Can Liu1,Rong Chen1,Hui Zhang1

1. College of Materials Science and Engineering,Hunan University2. School of Mechanical Engineering,Ningxia University

摘 要:An Al-Cu-Mg-Zr alloy,which obtained different homogenization cooling rates by changing the heattreated sample size,was compressed to various strains at the deformation temperature of 300℃ and strain rate of0.01 s-1.The results showed that the homogenization cooling rate had strong effects on the hot deformation behavior of the alloy.The flow stress and relative dynamic softening rate of the alloy were significantly higher under a high cooling rate(HCR) than those under a low cooling rate(LCR).Furthermore,based on X-ray diffraction,scanning electron microscopy,transmission electron microscopy,and thermodynamic equilibrium phase calculation,the substructure evolution in the grain interior,morphology,and spatial distribution of the precipitates were studied to determine the differences in the flow softening mechanism.The main softening mechanism could be summarized as dynamic recovery and precipitation coarsening for the LCR alloy and dynamic precipitation for the HCR alloy.

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