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首页> 外文期刊>Journal of Materials Engineering and Performance >Study on Flow Stress Model and Processing Map of Homogenized Mg-Gd-Y-Zn-Zr Alloy During Thermomechanical Processes
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Study on Flow Stress Model and Processing Map of Homogenized Mg-Gd-Y-Zn-Zr Alloy During Thermomechanical Processes

机译：均质Mg-Gd-Y-Zn-Zr合金热机械流动应力模型及工艺图研究。

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Quantities of billets were compressed with 50% height reduction on a hot process simulator to study the plastic flow behaviors of homogenized as-cast Mg-13Gd-4Y-2Zn-0.6Zr alloy. The test alloy was heat treated at 520 A degrees C for 12 h before thermomechanical experiments. The temperature of the processes ranged from 300 to 480 A degrees C. The strain rate was varied between 0.001 and 0.5 s(-1). According to the Arrhenius type equation, a flow stress model was established. In this model, flow stress was regarded as the function of the stress peak, strain peak, and the strain. A softening factor was used to characterize the dynamic softening phenomenon that occurred in the deformation process. Meanwhile, the processing maps based on the dynamic material modeling were constructed. The optimum temperature and strain rate for hot working of the test alloy were 480 A degrees C and 0.01 s(-1), respectively. Furthermore, the flow instability occurred in the two areas where the temperature ranged from 350 to 480 A degrees C at strain rate of 0.01-0.1 s(-1), and the temperature ranged from 450 to 480 A degrees C with a strain rate of 0.1 s(-1). According to the determined hot deformation parameters, four components were successfully formed, and the ultimate tensile strength, yield strength, and elongation of the component were 386 MPa, 331 MPa, and 6.3%, respectively.
机译：在热加工模拟器上将大量钢坯压缩50％的高度，以研究均质铸态Mg-13Gd-4Y-2Zn-0.6Zr合金的塑性流动行为。在热机械实验之前，将测试合金在520 A的温度下热处理12 h。该过程的温度范围为300至480 A摄氏度。应变速率在0.001至0.5 s（-1）之间变化。根据Arrhenius型方程，建立了流动应力模型。在该模型中，流动应力被视为应力峰值，应变峰值和应变的函数。软化因子用于表征变形过程中发生的动态软化现象。同时，建立了基于动态材料建模的加工图。试验合金热加工的最佳温度和应变速率分别为480 A摄氏度和0.01 s（-1）。此外，在两个区域中发生流动不稳定性，这两个区域的温度范围为350至480 A摄氏度，应变速率为0.01-0.1 s（-1），温度范围为450至480 A摄氏度，应变速率为0.01至0.1 s（-1）。 0.1 s（-1）。根据确定的热变形参数，成功地形成了四个组分，该组分的极限抗拉强度，屈服强度和伸长率分别为386 MPa，331 MPa和6.3％。

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