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首页> 外文期刊>Journal of Materials Engineering and Performance >Study on the Indentation Creep Behavior of Mg-4Al-RE-0.8Ca Magnesium Alloy
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Study on the Indentation Creep Behavior of Mg-4Al-RE-0.8Ca Magnesium Alloy

机译：Mg-4Al-RE-0.8Ca镁合金压痕蠕变行为的研究

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摘要

The indentation creep behavior of Mg-4Al-RE-0.8Ca (AEC4108) alloy was investigated with a homemade apparatus. The microstructure of the AEC4108 alloy and the chemical composition of the precipitation phases in the alloy before and after creep test were investigated by scanning electron microscope and energy-dispersive spectroscopy. The results reveal that the steady-state indentation creep rate of the AEC4108 alloy is increased with increasing temperature and applied stress. The logarithm of the steady-state creep rates is linearly related to the logarithm of the stress and the reciprocal of the absolute temperature. The indentation creep parameters of AEC4108 alloy are correlated using an empirical equation (epsilon) over dot(s) = 1.253 x 10(-8) x sigma(3.2) exp[-33.89/(RT)]. The thin acicular Al11La3 and the bone-shaped Al2Ca are precipitated along the grain boundaries, and the granular Al2La is formed within the grain. The indentation creep rate of AEC4108 alloy is controlled by the grain boundary slipping led by viscous dislocation movement. The indentation creep resistance of the AEC4108 alloy under temperature 398-448 K and stress 55-95 MPa is guaranteed by the precipitated phases with high thermal stability pinning at the grain boundary and within the grain.
机译：用自制设备研究了Mg-4Al-RE-0.8Ca（AEC4108）合金的压痕蠕变行为。通过扫描电子显微镜和能量色散光谱研究了AEC4108合金的微观结构和蠕变试验前后合金中析出相的化学组成。结果表明，AEC4108合金的稳态压痕蠕变速率随温度和施加应力的增加而增加。稳态蠕变率的对数与应力的对数和绝对温度的倒数线性相关。 AEC4108合金的压痕蠕变参数使用经验公式（ε）在点= 1.253 x 10（-8）x sigma（3.2）exp [-33.89 /（RT）]上进行关联。细的针状Al11La3和骨状的Al2Ca沿晶界析出，在晶粒内形成粒状的Al2La。 AEC4108合金的压痕蠕变速率受粘性位错运动导致的晶界滑移控制。 AEC4108合金在398-448 K的温度和55-95 MPa的应力下的耐压痕蠕变性能是由具有高热稳定性的析出相固定在晶界和晶粒内来保证的。

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