Hot Deformation Behavior of a Highly Alloyed Al-10.0Zn-2.6Mg-1.2Cu-0.15Zr Alloy Prepared by Electromagnetic Stirring Casting

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-02-01 DOI:10.1007/s12540-024-01889-1

Sheng Zhiyong, Zhao Wenjie, Zhao Yongxing, Wang Xu, Fan Xi, Liu Yu, Yuanchun Huang

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Abstract

In this work, the hot deformation behavior of highly alloyed Al-Zn-Mg-Cu alloy prepared by electromagnetic stirring casting and conventional direct chill casting with temperature range of 300–450℃ and strain rate of 10^− 4-10 s^− 1 is investigated by isothermal compression experiments. The processing maps of the two alloys were established based on dynamic material model, and the microstructure of the samples in the typical regions of the processing maps was characterized. The results indicate that the dynamic softening mechanism during deformation at 300℃/10^− 4 s^− 1 is dynamic recovery and discontinuous dynamic recrystallization, which changes to dynamic recovery and continuous dynamic recrystallization when deformed at 450 °C/10^− 4 s^− 1. A comparison showed that the electromagnetic stirring casting alloys show lower flow stress than the direct chill casting alloys at 300℃, and the difference in flow stress decreases with the increase in temperature. Electromagnetic stirring casting can reduce the instability zone of hot deformation and expand the processing window. The activation energy of hot deformation was reduced from 171.6 kJ/mol to 144.7 kJ/mol after electromagnetic field treatment. These phenomena were explained based on grain and second phase refinement according to microstructure examination.

Graphical Abstract

Abstract Image

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电磁搅拌铸造高合金化Al-10.0Zn-2.6Mg-1.2Cu-0.15Zr合金的热变形行为

采用等温压缩实验研究了电磁搅拌铸造和常规直冷铸造制备的高合金Al-Zn-Mg-Cu合金在温度范围为300 ~ 450℃、应变速率为10−4 ~ 10 s−1条件下的热变形行为。基于动态材料模型建立了两种合金的加工图，并对加工图中典型区域样品的显微组织进行了表征。结果表明：在300℃/10−4 s−1温度下变形时，合金的动态软化机制为动态恢复和不连续动态再结晶；在450℃/10−4 s−1温度下变形时，合金的动态软化机制为动态恢复和连续动态再结晶；对比结果表明，在300℃时，电磁搅拌铸造合金的流动应力低于直接冷却铸造合金，且随着温度的升高，流动应力差异减小。电磁搅拌铸造可以减少热变形不稳定区，扩大加工窗口。经电磁场处理后，热变形活化能由171.6 kJ/mol降至144.7 kJ/mol。通过显微组织分析，从晶粒细化和第二相细化两方面对这些现象进行了解释。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.