Hot deformation and processing map of an as-extruded Mg–Zn–Mn–Y alloy containing I and W phases
Hot deformation and processing map of an as-extruded Mg–Zn–Mn–Y alloy containing I and W phases
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DOI：
10.1016/j.matdes.2015.08.023
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发表时间：
2015-12
影响因子：
8.4
通讯作者：
N. Tahreen;Dingfei Zhang;F. Pan;X. Jiang;Dongyang Li;Daolun L. Chen
中科院分区：
文献类型：
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作者：
N. Tahreen;Dingfei Zhang;F. Pan;X. Jiang;Dongyang Li;Daolun L. Chen
通过在 300–400 °C 温度范围和 0.001–1 s−1 应变速率范围内的等温压缩试验，研究了添加 3.2 wt.% Y 的挤压态 ZM31（Mg–Zn–Mn）镁合金（即 ZM31 + 3.2Y）的热变形特性。基于双曲正弦方程的本构模型和加工过程 图用于描述流动应力对应变、应变率和变形温度的依赖性。观察到流变应力随着变形温度的升高和应变速率的降低而降低。该合金的形变活化能为 241 kJ/mol。生成真实应变为 0.1、0.2、0.3 和 0.4 时的加工图，以确定合金的热加工性区域，最佳热加工参数确定为变形温度 340–500 °C 和应变速率 0.001–0.03 s−1。EBSD 检查表明，动态再结晶发生得更广泛，动态再结晶的体积分数也更高。 随着变形温度的增加而增加。讨论了元素 Y 和第二相颗粒（I 相和 W 相）在热压缩变形过程中的作用。
The hot deformation characteristics of an as-extruded ZM31 (Mg–Zn–Mn) magnesium alloy with an addition of 3.2 wt.% Y, namely ZM31 + 3.2Y, have been studied via isothermal compression testing in a temperature range of 300–400 °C and a strain rate range of 0.001–1 s− 1. A constitutive model based on hyperbolic-sine equation along with processing maps was used to describe the dependence of flow stress on the strain, strain rate, and deformation temperature. The flow stress was observed to decrease with increasing deformation temperature and decreasing strain rate. The deformation activation energy of this alloy was obtained to be 241 kJ/mol. The processing maps at true strains of 0.1, 0.2, 0.3 and 0.4 were generated to determine the region of hot workability of the alloy, with the optimum hot working parameters being identified as deformation temperatures of 340–500 °C and strain rates of 0.001–0.03 s− 1. EBSD examinations revealed that the dynamic recrystallization occurred more extensively and the volume fraction of dynamic recrystallization increased with increasing deformation temperature. The role of element Y and second-phase particles (I- and W-phases) during hot compressive deformation was discussed.