Temperature Effect on Strain Hardening Behaviors of As‐Extruded Binary Magnesium Alloys,Advanced Engineering Materials

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Temperature Effect on Strain Hardening Behaviors of As‐Extruded Binary Magnesium Alloys
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-01-14 , DOI: 10.1002/adem.202001104
Chaoyue Zhao ₁ , Xianhua Chen _{1,

2} , Teng Tu ₁ , Ziyi Wang ₁ , Yuan Yuan ₁ , Fusheng Pan _{1,

2}

Affiliation

Herein, the effect of temperature on strain‐hardening behaviors of binary Mg‐3X (X = Al, Zn, Sn, Y, and Gd) alloys were investigated. Uniaxial tensile tests are carried out at room temperature (RT), 150 and 250 °C. These samples are composed of α‐Mg phase and second‐phase precipitates which exist only in Mg‐3Sn and Mg‐3Gd. In the temperature range of this work, dislocation movement dominates the plastic deformation process and strain‐hardening ability decreases with rising temperature due to stronger dynamic recovery. The amount of forest dislocations decreases at elevated temperature under the influence of dynamic recovery and grain boundary sliding (GBS), thus strain‐hardening ability is seriously weakened. However, a periodic serrated hardening curve appears in Mg‐3Y and Mg‐3Gd alloys at elevated temperature, which results from dynamic strain aging (DSA) effect. Moreover, with increasing deformation temperature, the decline scope of strain‐hardening ability of Mg‐3Y and Mg‐3Gd is significantly lesser than non‐RE binary alloys. The differences in strain‐hardening behavior of these alloys at various temperatures are mainly related to diffusion coefficients of alloying elements in α‐Mg matrix.

中文翻译：

温度对挤压态二元镁合金应变硬化行为的影响

在此，研究了温度对二元Mg-3X（X = Al，Zn，Sn，Y和Gd）合金的应变硬化行为的影响。单轴拉伸试验在室温（RT），150和250°C下进行。这些样品由仅存在于Mg-3Sn和Mg-3Gd中的α-Mg相和第二相沉淀组成。在这项工作的温度范围内，位错运动在塑性变形过程中占主导地位，并且由于较强的动态恢复，应变硬化能力随温度的升高而降低。在动态恢复和晶界滑动（GBS）的影响下，高温下森林的位错量减少，因此应变硬化能力被严重削弱。但是，在高温下，Mg-3Y和Mg-3Gd合金会出现周期性的锯齿状硬化曲线，这是由于动态应变老化（DSA）效应引起的。此外，随着变形温度的升高，Mg-3Y和Mg-3Gd的应变硬化能力的下降幅度明显小于非RE二元合金。这些合金在不同温度下的应变硬化行为差异主要与合金元素在α-Mg基体中的扩散系数有关。

更新日期：2021-01-14

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