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The hot deformation behavior, microstructure evolution and texture types of as-cast Mg–Li alloy
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.jallcom.2020.154868
Xiaoqiang Li , Liang Ren , Qichi Le , Peipeng Jin , Chunlong Cheng , Tong Wang , Ping Wang , Xiong Zhou , Xingrui Chen , Dandan Li

Abstract In this study, aiming to systematically investigate the hot deformation mechanism, microstructure evolution and texture types of Mg–5Li–3Al–2Zn (LAZ532) alloy, and confirm the optimum constitutive model and hot working conditions of LAZ532 alloy. The hot compression test of LAZ532 alloy was performed on Gleeble-3500 simulator at deformation temperatures and strain rates in the range of 200 °C –350 °C and 0.001 s−1–1 s−1, respectively. The experimental results showed that the established optimum constitutive model could accurately predict the hot deformation behavior of LAZ532 alloy, and the stable hot-deformation zones with peak efficiency of power dissipation were concentrated in the zones range of 300 °C , 1 s−1, 0.001 s−1–0.01 s−1 and 350 °C , 0.01 s−1–0.1 s−1, respectively. By observing the microstructure of the alloy showed that the dynamic recrystallization (DRX) mechanism could be considered to be discontinuous dynamic recrystallization (DDRX), and the recrystallization degree increases with the increasing of deformation temperatures or decreasing of strain rates. Moreover, based on EBSD analysis, it was found that both the deformed microstructure and recrystallization microstructure in the alloy had a //CD texture, and a few {10 1 ¯ 2} extension twins were observed in the coarse deformed grains.

中文翻译:

铸态镁锂合金的热变形行为、组织演变和织构类型

摘要 本研究旨在系统地研究Mg-5Li-3Al-2Zn(LAZ532)合金的热变形机制、组织演变和织构类型,确定LAZ532合金的最佳本构模型和热加工条件。LAZ532 合金的热压缩试验在 Gleeble-3500 模拟器上进行,变形温度和应变速率分别在 200 °C –350 °C 和 0.001 s-1-1 s-1 范围内。实验结果表明,所建立的最优本构模型能够准确预测LAZ532合金的热变形行为,具有峰值功率耗散效率的稳定热变形区集中在300℃、1s−1、 0.001 s-1–0.01 s-1 和 350 °C 分别为 0.01 s-1–0.1 s-1。通过观察合金的显微组织表明,动态再结晶(DRX)机制可以认为是不连续动态再结晶(DDRX),再结晶度随着变形温度的升高或应变速率的降低而增加。此外,基于EBSD分析发现,合金中的变形组织和再结晶组织均具有//CD织构,并且在粗大变形晶粒中观察到少量{10 1 ¯ 2}拉伸孪晶。
更新日期:2020-08-01
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