铸造AZ91镁合金室温多轴棘轮行为的实验研究

胡冰晖; 雷宇; 李航; 王子仪; 于超; 康国政

doi:10.1007/s12613-024-2827-6

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 一校

Binghui Hu, Yu Lei, Hang Li, Ziyi Wang, Chao Yu, and Guozheng Kang, Experimental observations on the nonproportional multiaxial ratchetting of cast AZ91 magnesium alloy at room temperature, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2827-6

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Binghui Hu, Yu Lei, Hang Li, Ziyi Wang, Chao Yu, and Guozheng Kang, Experimental observations on the nonproportional multiaxial ratchetting of cast AZ91 magnesium alloy at room temperature, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2827-6

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研究论文

铸造AZ91镁合金室温多轴棘轮行为的实验研究

西南交通大学力学与航空航天学院应用力学与结构安全四川省重点实验室, 成都 611756, 中国

通讯作者:
康国政 E-mail: guozhengkang@swjtu.edu.cn

文章亮点

(1) 针对铸造AZ91镁合金，系统地开展了应力控制的单轴路径、纯扭转路径和多轴加载路径循环加载实验。

(2) 揭示了铸造AZ91镁合金的多轴棘轮行为演化特征及其应力水平和加载路径依赖性。

(3) 讨论了铸造镁合金和挤压镁合金多轴循环变形行为（尤其是棘轮行为）的不同之处。

中文摘要

本研究采用薄壁圆管状试样对铸造AZ91镁合金的室温多轴棘轮行为开展了一系列实验研究，讨论了不同轴向–扭向组合加载路径下该材料的多轴棘轮行为演化特征，揭示了铸造镁合金多轴棘轮行为的路径相关性。研究发现：在非比例多轴加载路径下，铸造AZ91镁合金表现出明显的非比例附加软化效应，其轴向的棘轮行为与单轴加载路径和45°比例加载路径情形相比更加显著；该合金的多轴棘轮行为强烈依赖于加载路径的形状，并随施加的应力幅值与轴向平均应力的增大而变得更为显著；在不同的多轴加载路径下，铸造AZ91镁合金轴向和扭向的应力–应变曲线都是对称的外凸状，且轴向的棘轮行为最终会达到准棘轮安定状态。这些研究成果将为铸造镁合金的本构模型建立提供丰富的实验数据。

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Research Article

Experimental observations on the nonproportional multiaxial ratchetting of cast AZ91 magnesium alloy at room temperature

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Abstract

Abstract

The nonproportional multiaxial ratchetting of cast AZ91 magnesium (Mg) alloy was examined by performing a sequence of axial–torsional cyclic tests controlled by stress with various loading paths at room temperature (RT). The evolutionary characteristics and path dependence of multiaxial ratchetting were discussed. Results illustrate that the cast AZ91 Mg alloy exhibits considerable nonproportional additional softening during cyclic loading with multiple nonproportional multiaxial loading paths; multiaxial ratchetting presents strong path dependence, and axial ratchetting strains are larger under nonproportional loading paths than under uniaxial and proportional 45° linear loading paths; multiaxial ratchetting becomes increasingly pronounced as the applied stress amplitude and axial mean stress increase. Moreover, stress–strain curves show a convex and symmetrical shape in axial/torsional directions. Multiaxial ratchetting exhibits quasi-shakedown after certain loading cycles. The abundant experimental data obtained in this work can be used to develop a cyclic plasticity model of cast Mg alloys.
- cast magnesium alloy;
- ratchetting;
- multiaxial loading;
- loading path;
- stress level

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