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Investigation of tensile creep behavior of Mg-Gd-Y-Zr alloy based on creep constitutive model

机译：基于蠕变本构模型的Mg-Gd-Y-ZR合金的拉伸蠕变行为研究

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摘要

The tensile creep behavior of as-extruded and T6 treated Mg-8Gd-3Y-0.3Zr (GW83) alloy was estimated under temperature at 170-200 °C and stress at 40-70 MPa. The results showed that the primary creep strain and steady state creep rate increased, while the duration of steady state creep decreased with increasing temperature and stress. The primary creep constitutive model of GW83 alloy kept an Andrade power law ε = βt~k with k value of 0.24-0.6 for as-extruded alloy and 0.13-0.49 for T6 alloy, respectively. The steady state creep plastic deformation of as-extruded and T6 state alloys can be expressed by Arrhenius constitutive equations with stress exponents 5.6-5.9 and 8.9-9.8, creep activity energy 124.9-135.6 kJ/mol and 152.2-195.8 kJ/mol, respectively. The tensile creep resistance of GW83 alloy improved significantly by T6 heat treatment, the effect of temperature on steady state creep rate was relatively moderate, and the tensile creep plastic deformation of GW83 alloy mainly was controlled by applied stress. The steady state creep deformation mechanism of as-extruded GW83 alloy was regulated by Mg self-diffusion conducted by dislocation climb before heat treatment, and then transformed to dislocation cross-slip after T6 treated. The recrystallization and texture evolution of (0002) and (10-10) played a non-ignorable effect on the tensile creep deformation. The creep rupture life can be predicted by steady state creep rate that will be controlled by temperature under low and intermediate stress and by stress under larger applied stress, respectively. The creep fracture surfaces with coarse dimples and tear ridges presented as ductile transgranular fracture features with the secondary cracks occurred.
机译：以挤出和T6处理的Mg-8GD-3Y-0.3ZR（GW83）合金的拉伸蠕变行为在170-200℃的温度下估计，并在40-70MPa处估计。结果表明，初级蠕变应变和稳态蠕变率增加，而稳态蠕变的持续时间随着温度和应力的增加而降低。 GW83合金的初级蠕变本构型模型远处将k值为0.24-0.6的Andrade电力律ε=βt〜k分别用于挤出合金的0.24-0.6和T6合金的0.13-0.49。挤出和T6状态合金的稳态蠕变塑性变形可以通过Arrhenius组成型方程式表达，应力指数为5.6-5.9和8.9-9.8，蠕变活动能量分别为124.9-135.6 kJ / mol和152.2-195.8 kJ / mol 。 GW83合金的拉伸蠕变电阻通过T6热处理显着提高，温度对稳态蠕变率的影响相对中等，并且GW83合金的拉伸蠕变塑性变形主要由施加应力控制。通过在热处理前通过位错爬升进行的Mg自扩散来调节用挤出的GW83合金的稳态蠕变变形机制，然后在处理T6处理后转化为位错滑滑。 （0002）和（10-10）的重结晶和质地演化在拉伸蠕变变形上发挥了非无知作用。通过稳态蠕变速率可以通过稳态蠕变率来预测蠕变破裂寿命，该蠕变率将通过温度和中间应力和较大的施加应力下的应力控制。具有粗糙凹槽和泪脊的蠕变断裂表面，呈现为延展性响囊骨折特征，发生二次裂缝。

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  • 来源
    《Materials Science and Engineering》 |2021年第23期|140567.1-140567.13|共13页
  • 作者

    Yaocheng Zhang; Zheng Liu; Song Pang; Tao Meng; Yating Zhi; Yuling Xu; Lv Xiao; Ruifeng Li;

  • 作者单位

    Jiangsu Key Laboratory of Recycling and Reuse Technology for Mechanical and Electronic Products Jiangsu 215500 PR China;

    School of Mechanical and Electrical Engineering Guilin University of Aerospace Technology Guilin Guangxi 541004 PR China;

    Shanghai Spaceflight Precision Machinery Institute Shanghai 201600 PR China;

    Jiangsu Key Laboratory of Recycling and Reuse Technology for Mechanical and Electronic Products Jiangsu 215500 PR China;

    Jiangsu Key Laboratory of Recycling and Reuse Technology for Mechanical and Electronic Products Jiangsu 215500 PR China;

    Shanghai Spaceflight Precision Machinery Institute Shanghai 201600 PR China;

    Shanghai Spaceflight Precision Machinery Institute Shanghai 201600 PR China;

    School of Materials Science and Engineering Jiangsu University of Science and Technology Jiangsu 212003 PR China;

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  • 正文语种 eng
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  • 关键词

    Mg-Gd-Y-Zr alloy; Tensile creep; Creep resistance; Creep mechanism; Texture;

    机译：Mg-Gd-Y-ZR合金;拉伸蠕变;抗蠕变;蠕变机制;质地;

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