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Grain boundary sliding and non-constancy strain during stress relaxation of pure Mg

机译：纯镁型应力松弛过程中的晶界滑动和非恒定应变

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摘要

Stress relaxation during plastic deformation has been reported to improve ductility of metallic materials. In this study, the stress relaxation behaviour in pure magnesium is investigated during interrupted uniaxial tensile tests. During intermittent stopping of the machine for relaxation studies, the total strain is expected to remain constant. However, an anomalous non-constancy in total strain is observed in the present work. The total strain increases with relaxation time. Additional in-situ tensile tests indicate that the non-constant total strain is restricted only in the gauge area of the specimen, indicating a likely shear dominated deformation such as grain boundary sliding (GBS) responsible for the anomalous behaviour. The role of GBS during relaxation is studied using the deformation induced evolution of surface inhomogeneity. Determinations of surface profiling step heights at grain boundaries and inclination of grains were used to quantify the effect of GBS. The estimated activation volume of 4.35 b~3 further confirms the role of slip induced GBS on the deformation. A new stress relaxation model accommodating GBS is proposed and is found to fit the experimental data accurately.
机译：据报道，塑性变形期间应力松弛以改善金属材料的延展性。在该研究中，在中断的单轴拉伸试验期间研究了纯镁的应力松弛行为。在间歇停止机器进行放松研究中，预计总应变将保持恒定。然而，在本作工作中观察到总菌株中的异常不恒定。总应变随着弛豫时间而增加。额外的原位拉伸试验表明，非恒定的总菌株仅限于样本的仪表区域，表示可能的剪切占状化变形，例如负责异常行为的晶界滑动（GBS）。研究了GB在放松期间的作用是使用表面不均匀性的变形诱导的进化进行了放松的。晶界的表面分析步骤高度的测定和晶粒的倾斜度来量化GBS的作用。估计的活化体积为4.35b〜3进一步证实了滑移诱导的GBS对变形的作用。提出了一种新的应力松弛模型，并被发现精确地适合实验数据。

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  • 来源
    《Materials Science and Engineering》 |2021年第10期|141349.1-141349.11|共11页
  • 作者

    Anand Varma; Aditya Gokhale; Hariharan Krishnaswamy; Dilip K. Banerjee; Jayant Jain;

  • 作者单位

    Department of Materials Science and Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India;

    Department of Materials Science and Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India;

    Department of Mechanical Engineering Indian Institute of Technology Madras Chennai 600036 India;

    Material Measurement Laboratory National Institute of Standards and Technology (NIST) Gaithersburg MD 20899 USA;

    Department of Materials Science and Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India;

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  • 正文语种 eng
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  • 关键词

    Stress relaxation; Magnesium; Grain boundary sliding;

    机译：压力松弛;镁;晶界滑动;

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