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首页> 美国卫生研究院文献>Materials >Hot Deformation Behavior of Homogenized Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr Alloy via Hot Compression Tests
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Hot Deformation Behavior of Homogenized Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr Alloy via Hot Compression Tests

机译：均质Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr合金热压缩行为的热变形行为

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摘要

Mg-Gd-Y-Zn-Zr Mg alloys show excellent performance in high-end manufacturing due to its strength, hardness and corrosion resistance. However, the hot deformation and dynamic recrystallization (DRX) behaviors of Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr were not studied. For this article, hot compression behavior of homogenized high rare-earth (RE) content Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr (wt%) alloy was investigated by using the Gleeble-3500D thermo-simulation test machine under the temperature of 350–500 °C and the strain rate of 0.001–1 s−1. It was found that the high flow stress corresponded to the low temperature and high strain rate, which showed DRX steady state curve during the hot compression. The hot deformation average activation was 263.17 kJ/mol, which was obtained by the analysis of the hyperbolic constitutive equation and the Zener-Hollomon parameter. From observation of the microstructure, it was found that kink deformation of long period stacking ordered (LPSO) phase was one of the important coordination mechanisms of hot deformation at low temperature. The processing map with the strain of 0.5 was established under the basis of dynamic material model (DMM); it described two high power dissipation domains: one appearing in the temperature range of 370–440 °C and the strain rate range of 0.001–0.006 s−1, the other appearing in the temperature range of 465–500 °C and strain rate range of 0.001–0.05 s−1, in which dynamic recrystallization (DRX) mainly ocurred. The highest degree of DRX was 18% from the observation of the metallographic.
机译：Mg-Gd-Y-Zn-Zr Mg合金由于其强度，硬度和耐腐蚀性而在高端制造中显示出优异的性能。但是，未研究Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr的热变形和动态重结晶（DRX）行为。在本文中，使用Gleeble-3500D热模拟试验机研究了均质的高稀土（Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr（wt％）合金）的热压缩行为。温度为350–500°C，应变速率为0.001–1 s -1 。发现高流动应力对应于低温和高应变率，在热压缩过程中显示出DRX稳态曲线。通过分析双曲本构方程和Zener-Hollomon参数获得的平均热变形激活率为263.17 kJ / mol。从微观结构观察，发现长期堆积有序（LPSO）相的扭结变形是低温热变形的重要协调机制之一。在动态材料模型（DMM）的基础上建立了应变为0.5的加工图；它描述了两个高功耗域：一个出现在370–440°C的温度范围内，应变率范围为0.001–0.006 s -1 ，另一个出现在465–400°C的温度范围内。 500°C，应变速率范围为0.001–0.05 s -1 ，其中主要发生动态重结晶（DRX）。从金相观察，最高DRX度为18％。

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