Flow Stress Behavior and Microstructure of 7150 Aluminum Alloy during Hot Deformation
The flow stress behavior and the deformation microstructure of 7150 aluminum alloy during hot compression deformation were studied by thermal simulation test using Gleeble thermal simulation machine at temperature ranging from 300 to 450 and strain-rate from 0.01s-1 to 10s-1. The constitutive equation of the plastic deformation of 7150 alloy at elevated temperature was obtained by introducing Zener-Hollomon parameter. The experimental results indicate that the flow stress and peak stress increase with increasing strain rate, and decrease with increasing deformation temperature, which can be described by a constitutive equation in hyperbolic sine function, whose values of related parameters A,α, n and activation energy for hot deformation Q, are 4.161×1014 s-1, 0.01956 MPa-1, 5.14336 and 229.7531kJ/mol respectively. With increasing the temperature and decreasing the strain rate, the main soften mechanism of the 7150 alloy transforms from dynamic recovery to dynamic re-crystallization.
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Document Type: Research Article
Affiliations: National Engineering Research Center for Plastic Working of Aluminium Alloys, Shandong Nanshan Aluminium Co., Ltd., Longkou 265713, Shandong China
Publication date: June 15, 2015
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- Journal of Aeronautical Materials, founded in 1981, is sponsored by Chinese Society of Aeronautics and Astronautics, and edited and published by editiorial board of Journal of Aeronautical Materials,AVIC Beijing Institute of Aeronautical Material(BIAM).It has been indexed in Scopus (Holland), INSPEC (U.K.), AJ (Russia), CA (US) and UPD (US). Journal of Aeronutical Materials is devoted to reporting new and original experimental and theoretical basic research of aeronautical materials, such as composite design,technology,testing and charaacterizing, and so on.
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