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Dynamic recrystallization model of the Cu–Cr–Zr–Ag alloy under hot deformation

Published online by Cambridge University Press:  15 April 2016

Yi Zhang*
Affiliation:
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China; and Collaborative Innovation Center of Nonferrous Metals, Henan University of Science and Technology, Henan Province, Luoyang 471003, China
Baohong Tian
Affiliation:
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China; and Collaborative Innovation Center of Nonferrous Metals, Henan University of Science and Technology, Henan Province, Luoyang 471003, China
Alex A. Volinsky*
Affiliation:
Department of Mechanical Engineering, University of South Florida, Tampa 33620, USA
Xiaohong Chen
Affiliation:
School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Huili Sun
Affiliation:
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China; and Collaborative Innovation Center of Nonferrous Metals, Henan University of Science and Technology, Henan Province, Luoyang 471003, China
Zhe Chai
Affiliation:
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China; and School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Ping Liu
Affiliation:
School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Yong Liu
Affiliation:
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China; and Collaborative Innovation Center of Nonferrous Metals, Henan University of Science and Technology, Henan Province, Luoyang 471003, China
*
a)Address all correspondence to these authors. e-mail: zhshgu436@163.com
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Abstract

Hot deformation and dynamic recrystallization (DRX) behavior of the Cu–Cr–Zr–Ag alloy were studied by hot compressive tests in the 650–950 °C temperature and 0.001–10 s−1 strain rate ranges using Gleeble-1500D thermomechanical simulator. The activation energy of deformation was determined as Q = 343.23 kJ/mol by the regression analysis. The critical conditions, including the critical strain and stress, for the occurrence of DRX were determined based on the alloy strain hardening rate. The critical strain related to the onset of DRX decreases with temperature. The ratios of the critical to peak stress and critical to peak strain were also identified as 0.91 and 0.49, respectively. The evolution of DRX microstructure strongly depends on the deformation conditions in terms of temperature and strain rate. Dislocation generation and multiplication are the main hot deformation mechanisms for the alloy. The addition of Ag can refine the grain and effectively improve the DRX of the Cu–Cr–Zr alloy. It can also inhibit the growth of the DRX grains at 950 °C deformation temperature, making the microstructure much more stable.

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Articles
Copyright
Copyright © Materials Research Society 2016 

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References

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