Deformation behavior and microstructure evolution of wrought magnesium alloys
Deformation behavior and microstructure evolution of wrought magnesium alloys
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变形镁合金的变形行为和显微组织演变
DOI：
10.3901/cjme.2013.03.437
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发表时间：
2013-05
期刊：
影响因子：
--
通讯作者：
Yingzi WANG
中科院分区：
文献类型：
--
作者：
Shouren WANG;Linghui SONG;Kang Sukbong;Cho Jaehyung;Yingzi WANG
变形镁合金AZ 31、AZ 80、AZ 91、ZK 60等在不同温度和应变速率下的变形行为研究较多，但对AZ 41 M和ZK 60 M变形行为的研究较少，特别是在双辊铸轧（TRC）状态下。同时，现有的研究仅集中于变形条件下镁合金晶粒细化规律的研究，尚未揭示变形机制。采用Gleeble 1500热模拟试验机和有限元分析软件虚拟模拟的方法，研究了AZ 41 M和ZK 60 M镁合金在250-400 °C和0.001-1 s-1应变速率范围内的热压缩行为。模拟结果表明，正弦双曲线律是适用于较宽变形条件的流变应力模型。ZK 60 M合金最合理的变形条件为350 °C/0.1 s−1（TRC）和350 °C/1 s−1（CC）; AZ 41 M合金最合理的变形条件为300 °C/0.01 s−1（TRC）和350 °C/0.1 s−1（CC）。在相同变形条件下，分析了两种合金的变形行为和动态再结晶机制。利用光学显微镜（OM）和电子背散射衍射（EBSD）对AZ 41 M和ZK 60 M合金在不同变形条件下的微观组织进行了观察，揭示了两种合金的流变行为和变形机制。加工硬化和加工软化有助于激活促进DRX的基底、非基底滑移系统。研究揭示了AZ 41 M和ZK 60 M镁合金的变形行为和变形机理，得出了最佳变形参数和工艺，为AZ 41 M和ZK 60 M镁合金的生产和应用提供了理论依据。
There are many researches on the deformation behavior of wrought magnesium alloys, such as AZ31, AZ80, AZ91, and ZK60 magnesium alloys at different temperatures and strain rates, but few of them focuses on the deformation behavior of AZ41M and ZK60M alloys, especially under the twin-roll casting (TRC) state. Meanwhile, the existing researches only focus on the grain refinement law of the magnesium alloys under deformation conditions, the deformation mechanism has not been revealed yet. The hot compression behavior of AZ41M and ZK60M magnesium alloys under the temperature and strain rate ranges of 250–400 °C and 0.001–1 s−1 are studied by thermal simulation methods using Gleeble 1500 machine and virtual simulation using finite element analysis software. Simulation results show that sine hyperbolic law is the most suitable flow stress model for wider deformation conditions. The most reasonable selected deformation conditions of ZK60M alloy is 350 °C/0.1 s−1 for TRC and 350 °C/1 s−1 for conventional casting (CC), while AZ41M alloy is 300 °C/0.01 s−1 for TRC and 350 °C/0.1 s−1 for CC. Deformation behavior and dynamic recrystallization (DRX) mechanism of them are analyzed at the same deformation conditions. The microstructures of AZ41M and ZK60M alloys are observed at different deformed conditions by optical microscopy (OM) and electron back scatter diffraction (EBSD) and it reveals the flow behavior and deformation mechanism of them. Working harden and work soften contribute to the activation of basal, non-basal slip systems which promote DRX. The proposed research reveals the deformation behavior and mechanism of the AZ41M and ZK 60M magnesium alloys and concludes their optimized deformation parameters and processes and provides a theory basis for their manufacturing and application.
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DOI：
10.1016/j.msea.2007.11.106
发表时间：
2009-01
影响因子：
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