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《Materials for Mechanical Engineering》 2013-05
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Dynamic Microstructural Evolution of 7150 Aluminum Alloy during Hot Compression Deformation

WENG Shu-chu1,ZHANG Hui1,LI Luo-xing2,CHEN Rong1,JIANG Fu-lin1(1.College of Materials Science and Engineering;2.State Key Laboratory of Advanced Design and Manufacture for Vehicle Body,Hunan University,Changsha 410082,China)  
Hot compression test for 7150 aluminum alloy were preformed on Gleeble-1500 at the temperature of 450 ℃ and the strain rate of 10 s-1 with different true strains of 0.2,0.4,0.6,0.8.The microstructural evolution was studied by optical microscopy and transmission electron microscopy.The results show that the true stress increased rapidly with the increase of the true strain and up to a peak value,then followed by a gradual decrease,which showed a dynamic flow softening.The equiaxed grains were elongated and the microstructure evolved from dislocation tangles to dislocation cell and sub-grain with the increase of the true strain.The T(AlZnMgCu) phase and the Al3Zr precipitated phase coarsened and thus weakened the influence of them on inhibiting dynamic recrystallization.
【Fund】: 国家重点基础研究发展计划资助项目(2009CB623704);; 国际科技合作项目(2010DFB70180)
【CateGory Index】: TG146.21;TG113.12
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