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Deformation behaviors and cyclic strength assessment of AZ31B magnesium alloy based on steady ratcheting effect

机译：基于稳定棘轮效应的AZ31B镁合金的变形行为和循环强度评估

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摘要

In this paper, deformation behaviors and microstructure evolution of a hot-rolled AZ31B magnesium alloy under cyclic loadings are investigated. The relationship between plastic deformation and microstructure evolution and the crack formation mechanisms are discussed. Under a high cyclic stress (90–140 MPa), steady ratcheting effect occurred in the material and the development of ratcheting strain went through three stages: 1) Stage I - initial rapid increase stage; 2) Stage II - steady stage; and 3) Stage III - final abrupt increase stage. Under a low cyclic stress (≤ 90 MPa), inconspicuous ratcheting effect was found in the material, indicating a light damage in the material. When the cyclic stress is below 30 MPa, no ratcheting effect is found and only elastic deformation occurs in the material. The formation of cracks in Stages I & II is mainly due to the activation of the basal slip system. The mean geometrically necessary dislocations (GND) are calculated to analyze the relationship between the basal slip and the ratcheting effect during the cyclic loading. Finally, a new approach is proposed to estimate the AZ31B magnesium alloy’s cyclic strength (at 107cycles) according to the cyclic stress at which steady ratcheting effect starts to occur in the material.
机译：本文研究了循环载荷作用下热轧AZ31B镁合金的变形行为和组织演变。讨论了塑性变形与微观组织演变之间的关系以及裂纹形成机理。在高循环应力（90-140 MPa）下，材料产生了稳定的棘轮效应，棘轮应变的发展经历了三个阶段：1）第一阶段-初始快速增长阶段； 2）第二阶段-稳定阶段； 3）第三阶段-最终突然增加阶段。在低循环应力（≤90 MPa）下，在材料中发现不明显的棘轮效应，表明材料受到轻度损坏。当循环应力低于30 MPa时，没有棘轮效应，并且材料中仅发生弹性变形。第一和第二阶段裂缝的形成主要是由于基底滑动系统的激活。计算平均几何必要位错（GND），以分析循环载荷期间基滑与棘轮效应之间的关系。最后，提出了一种新方法来根据材料中开始出现稳定的棘轮效应的循环应力估算AZ31B镁合金的循环强度（在107个循环时）。

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  • 来源
    《Materials Science and Engineering》 |2018年第18期|212-220|共9页
  • 作者

    Zhifeng Yan; Denghui Wang; Xiuli He; Wenxian Wang; Hongxia Zhang; Peng Dong; Chenhao Li; Yuli Li; Jun Zhou; Zhuang Liu; Liyong Sun;

  • 作者单位

    Shanxi Key Laboratory of Advanced Magnesium-Based Materials, School of Materials Science and Engineering, Taiyuan University of Technology;

    Shanxi Key Laboratory of Advanced Magnesium-Based Materials, School of Materials Science and Engineering, Taiyuan University of Technology;

    Shanxi Key Laboratory of Advanced Magnesium-Based Materials, School of Materials Science and Engineering, Taiyuan University of Technology,Department of Mechanical Engineering, Taiyuan Institute of Technology;

    Shanxi Key Laboratory of Advanced Magnesium-Based Materials, School of Materials Science and Engineering, Taiyuan University of Technology;

    Shanxi Key Laboratory of Advanced Magnesium-Based Materials, School of Materials Science and Engineering, Taiyuan University of Technology;

    Shanxi Key Laboratory of Advanced Magnesium-Based Materials, School of Materials Science and Engineering, Taiyuan University of Technology;

    Shanxi Key Laboratory of Advanced Magnesium-Based Materials, School of Materials Science and Engineering, Taiyuan University of Technology;

    Northwest Institute for Nonferrous Metal Research;

    Shanxi Key Laboratory of Advanced Magnesium-Based Materials, School of Materials Science and Engineering, Taiyuan University of Technology,Department of Mechanical Engineering, Pennsylvania State University Erie, The Behrend College;

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology;

    School of Engineering, Pennsylvania State University Erie, The Behrend College;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Magnesium alloy; Ratcheting effect; Microstructure evolution; Life assessment;

    机译：镁合金棘轮效应微观组织演变寿命评估;

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