High temperature deformation behavior and mechanism of spray deposited Al-Fe-V-Si alloy
Al-8.5Fe-1.3V-1.7Si alloy was prepared by spray deposition and hot extrusion.The high temperature plastic deformation behavior of the spray deposited Al-8.5Fe-1.3V-1.7Si alloy was investigated in the strain rate range of 2.77×10.4.2.77×10.2 s.1 and temperature range of 350.550 by Gleebe ℃ -1500 thermomechanical simulator.The mechanism of the high temperature plastic deformation of the alloys was studied by TEM associated with the analysis of Rosler-Artz physical constitutive relationship based on the model of dislocation detaching from dispersion particles.The results show that Al-Fe-V-Si alloy has low strain hardening coefficient,and even exhibits work softening.Stress exponent n and activation energy Q were calculated based on Zener-Hollomon relation and Rosler-Artz physical model respectively.The Rosler-Artz physical model can give a good prediction for the abnormal behavior of high temperature deformation of spray deposited Al-Fe-V-Si alloy,that is,n larger than 8 and Q higher than 142 kJ/mol.However,because of the highly refined microstructure,the high temperature deformation behavior of spray deposited Al-Fe-V-Si alloy deviates more or less from the law predicted by using Rosler-Artz physical model.
spray deposition heat-resistant aluminum alloy constitutive equation high temperature plastic deformation stress exponent activation energy dislocation detachment
XIAO Yu-de WANG Wei LI Wen-xian
School of Materials Science and Engineering,Central South University,Changsha 410083,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）