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Threshold creep behaviour of an aged Mg-Zn-Ca alloy

机译：时效Mg-Zn-Ca合金的阈值蠕变行为

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摘要

The creep characteristics of an aged Mg-4Zn-0.5Ca (wt%) were investigated using impression creep tests in the temperature range of 423-523 K and under punch stresses in the range of 225-750 MPa for dwell times up to 3600 s. The creep behaviour of the alloy was found to be associated with a threshold stress and well-described by the Garofalo hyperbolic sine equation modified for the threshold stress concept The stress exponent of 5 and the activation energy for creep close to that of pipe diffusion in Mg, i.e. 97 kj mol~(-1) implies that dislocation climb controlled by diffusion through dislocation cores is the dominant rate-controlling mechanism. However, fitting the Garofalo equation to the experimental data showed that power-law breakdown (PLB) occurred in the material at high stress levels, especially at low temperatures. The threshold stress, appeared at low stress levels and low temperatures, was attributed to the nano-precipitates formed in the microstructure during aging treatment. The threshold stress was temperature-dependent, decreasing with increasing testing temperature and disappearing at about 575 K.
机译：使用压痕蠕变试验在423-523 K的温度范围内，在225-750 MPa的冲切应力下，对长达3600 s的保压时间，研究了老化的Mg-4Zn-0.5Ca（wt％）的蠕变特性。 。发现合金的蠕变行为与阈值应力有关，并通过针对阈值应力概念修改的Garofalo双曲正弦方程进行了很好的描述。应力指数为5，蠕变的活化能接近镁中管道扩散的活化能。 ，即97 kj mol〜（-1）表示位错爬升受位错核扩散控制是主要的速率控制机制。然而，将Garofalo方程拟合到实验数据表明，幂律击穿（PLB）在高应力水平下，特别是在低温下发生在材料中。在低应力水平和低温下出现的阈值应力归因于时效处理期间在微观结构中形成的纳米沉淀。阈值应力与温度有关，随着测试温度的升高而降低，并在约575 K时消失。

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  • 来源
    《Materials Science and Engineering》 |2017年第1期|536-543|共8页
  • 作者

    F. Naghdi; R. Mahmudi; J.Y. Kang; H.S. Kim;

  • 作者单位

    School of Metallurgical and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran;

    School of Metallurgical and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran;

    Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South Korea;

    Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South Korea;

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  • 正文语种 eng
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  • 关键词

    Mg-Zn-Ca alloy; Aging treatment; Impression creep; Garofalo relationship; Threshold stress;

    机译：Mg-Zn-Ca合金;老化处理;印象蠕变;Garofalo关系;门槛压力;

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