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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

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High temperature deformation behavior andmechanism of spray deposited Al-Fe-V-Si alloy
XIAO Yu-de(肖于德), WANG Wei(王 伟), LI Wen-xian(黎文献)

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract: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.

 

Key words: spray deposition; heat-resistant aluminum alloy; constitutive equation; high temperature plastic deformation; stress exponent; activation energy; dislocation detachment

ISSN 1672-7029
CN 43-1423/U

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