Hot Deformation Behavior Considering Strain Effects and Recrystallization Mechanism of an Al-Zn-Mg-Cu Alloy

Autor: Jing Cao, Zhiyi Liu, Juangang Zhao, Jian Wang, Diping Zeng, Yangcheng Hu, Lei Luo, Song Bai
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Materials
Volume 13
Issue 7
Materials, Vol 13, Iss 1743, p 1743 (2020)
ISSN: 1996-1944
DOI: 10.3390/ma13071743
Popis: The hot deformation behavior of an Al-Zn-Mg-Cu alloy was investigated by hot compression test at deformation temperatures varying from 320 to 440 °
C with strain rates ranging from 0.01 to 10 s&minus
1. The results show that the Mg(Zn, Cu)2 particles as a result of the sufficient static precipitation prior to hot compression have an influence on flow softening. A constitutive model compensated with strain was developed from the experimental results, and it proved to be accurate for predicting the hot deformation behavior. Processing maps at various strains were established. The microstructural evolution demonstrates that the dominant dynamic softening mechanism stems from dynamic recovery (DRV) and partial dynamic recrystallization (DRX). The recrystallization mechanism is continuous dynamic recrystallization (CDRX). The microstructure observations are in good agreement with the results of processing maps. On account of the processing map and microstructural observation, the optimal hot processing parameters at a strain of 0.6 are at deformation temperature range of 390&ndash
440 °
C and strain rate range of 0.010&ndash
0.316 s&minus
1 with a peak efficiency of 0.390.
Databáze: OpenAIRE
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