Transactions of Materials and Heat Treatment

Title：Isothermal compression deformation and microstructure evolution behavior of die cast Al-Zn-Mg-Cu alloy

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ClassificationCode：TG146.2

year,vol(issue):pagenumber：2022,47(7):235-242

Abstract：

The isothermal compression test of die cast Al-Zn-Mg-Cu alloy was conducted under the conditions of the deformation temperature of 250-450 ℃ and the strain rate of 0.001-1 s-1 by thermal simulated test machine Gleeble-3800, and the hot deformation behavior and microstructure evolution law of the alloy were studied. Then, the Arrhenius hyperbolic sinusoidal constitutive equation of the alloy was established by linear fitting of relevant parameters, and the stress index and thermal deformation activation energy were 8.098 and 359.28 kJ·mol-1, respectively. The results of microstructure analysis show that the hot deformation behavior of the alloy is sensitive to deformation temperature and strain rate, and the deformation condition with low lnZ value is conducive to dynamic recrystallization. Combined with the results of EBSD analysis, it is found that the dynamic recovery is the main softening mechanism under the deformation condition of high lnZ value for the alloy, while under the deformation condition of low lnZ value, due to the combined action of dynamic recovery and continuous dynamic recrystallization, its main nucleation mode is bow-out mechanism

Funds：

山西省重点研发计划项目(201903D121040)

作者简介：赵晓东（1978-），男，博士，副教授 E-mail：zxd917@qq.com 通信作者：秦凤明（1988-），女，博士，副教授 E-mail：qinfengming1014@126.com

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