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首页> 外文期刊>International Journal of Plasticity >The effect of initial texture on micromechanical deformation behaviors in Mg alloys under a mini-V-bending test
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The effect of initial texture on micromechanical deformation behaviors in Mg alloys under a mini-V-bending test

机译：初始质地对MG弯曲试验下Mg合金中微机械变形行为的影响

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摘要

Micromechanical deformation behaviors of E-form fine grain (EFG), E-form coarse grain (ECG), and AZ31 magnesium (Mg) alloys were investigated and compared using a mini-V-bending test. EFG and ECG Mg alloys with a weaker texture showed better bendability compared with AZ31 alloy that has a stronger texture. The evolution of the microstructure and microtexture during the mini-V-bending process was experimentally analyzed via an electron back-scattered diffraction (EBSD) technique. This study was focused on the effect that deformation twinning exerts on the strain localization and crack initiation. The twin bands (TBs) developed in the tension zone of bent specimens found to be closely related to the strain localization and crack initiation during the mini-V-bending process. A resolved shear stress (RSS) criterion and microstructure based crystal plasticity finite element method (CPFEM) were used to theoretically predict the activation of {10 (1) over bar2} tension (TTW) and {10 (1) over bar1} compression (CTW) twins in Mg alloys under a mini-V-bending process. RSS analysis indicated that EFG and ECG Mg alloys are more favorable for the activity of TTW and less favorable for the activity of CTW when compared with AZ31 Mg alloy during a mini-V-bending process. However, RSS analysis was not effective in quantitatively predicting twin development. The relative activities of six deformation modes, accumulated twin fractions, and accumulated plastic strains were simulated via microstructure-based CPFEM modeling. Compared with RSS analysis, CPFEM precisely explained the twin behavior that has been experimentally observed in ECG and AZ31 Mg alloys.
机译：研究了E形细纹（EFG），E形粗粒（ECG）和AZ31镁（Mg）合金的微机械变形行为，并使用Mini-V弯曲试验进行比较。与具有更强质地的AZ31合金相比，EFG和ECG Mg合金具有较弱的纹理显示出更好的弯曲性。通过电子背散衍射（EBSD）技术实验分析了微观结构和微纹理的演变。本研究重点是变形Twinning对应变定位和裂纹引发的影响。在弯曲标本的张力区中开发的双带（TBS）发现与迷你V弯曲过程中的应变定位和裂纹引发密切相关。分辨的剪切应力（RSS）标准和基于微观结构的晶体塑性有限元方法（CPEMEM）用于理论上预测{10（1）上方的{10（1）°张力（TTW）和{10（1）上方的激活}压缩（ CTW）Mg合金中的双胞胎在MINI-V弯曲过程中。 RSS分析表明，与AZ31mg合金在Mini-V弯曲过程中，EFG和EDG Mg合金对TTW的活性更有利，并且对于CTW的活性而较低的活性。然而，RSS分析在定量预测双胞胎开发方面无效。通过基于微结构的CPFEM建模模拟六种变形模式，累积的双级分和累积塑料菌株的相对活性。与RSS分析相比，CPFEM精确地解释了在ECG和AZ31 Mg合金中进行了实验观察的双胞胎行为。

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