A modified constitutive model and hot compression instability behavior of Cu-Ag alloy

The hot compressive deformation behaviors of Cu−6wt.%Ag alloy were studied experimentally in the temperature range of 973−1123 K and the strain rate range of 0.01−10 s−1. The stress increases and reaches the maximum value when the true strain is very small, and then the stress changes slowly and ten...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2019-04, Vol.29 (4), p.764-774
Main Authors: WANG, Meng-han, YANG, Yong-chao, TU, Shun-li, WEI, Kang
Format: Article
Language:English
Subjects:
crack
Cu− Ag alloy
intragranular recrystallization
modified Arrhenius model
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Summary:The hot compressive deformation behaviors of Cu−6wt.%Ag alloy were studied experimentally in the temperature range of 973−1123 K and the strain rate range of 0.01−10 s−1. The stress increases and reaches the maximum value when the true strain is very small, and then the stress changes slowly and tends to be stable under the action of work hardening, dynamic recovery and recrystallization. The material parameters of the conventional Arrhenius constitutive model are only related to strain under different deformation conditions, and the prediction error is large, which cannot accurately characterize the hot deformation behavior of the alloy. To describe the hot deformation behavior of the alloy accurately, a modified constitutive model was established by considering the simultaneous influence of forming temperature, strain rate and strain. The results indicate that correlation coefficient (R) and the average absolute relative error (AARE) are 0.993 and 4.2%, respectively. The modified constitutive model can accurately describe the hot deformation behavior of Cu−6wt.%Ag alloy.
ISSN:1003-6326
DOI:10.1016/S1003-6326(19)64986-1