Research on Constitutive Models and Hot Workability of As-Homogenized Al- Zn-Mg-Cu Alloy During Isothermal Compression
- Resource Type
- Article
- Authors
- Dan Xiao; Xiaoyan Peng; Xiaopeng Liang; Ying Deng; Guofu Xu; Zhimin Yin
- Source
- Metals and Materials International, 23(3), pp.591-602 May, 2017
- Subject
- 재료공학
- Language
- English
- ISSN
- 2005-4149
1598-9623
Hot compression tests of as-homogenized Al-Zn-Mg-Cu alloy were performed at the deformation temperaturerange of 350-450 °C and the strain rate range of 0.001-1 s-1. The Arrhenius-type constitutive equation and theAvrami-type model were established to predict the flow behaviors of the alloy respectively. The processing map atthe true strain of 0.92 was developed to evaluate the workability of the alloy and the related microstructures wereinvestigated. The results show that the Avrami-type model has a higher accuracy to predict flow stress than theArrhenius-type constitutive equation. The stable deformation occurs under high temperature or low strain ratemainly owing to the dynamic recrystallization. Flow instability is prone to occur under the condition of low temperatureand high strain rate due to the initiation and the propagation of micro-cracks. According to the processingmap and corresponding microstructure characteristics, the optimum processing parameters are in the temperaturerange of 380-405 °C and the strain rate range of 0.006-0.035 s-1.