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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structure stability and mechanical properties of Mg-Al-based alloy modified with Y-rich and Ce-rich misch metals
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Structure stability and mechanical properties of Mg-Al-based alloy modified with Y-rich and Ce-rich misch metals

机译：富Y和富Ce的Mg-Al基合金的组织稳定性和力学性能

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摘要

Mg-3.4 wt.% Al-based alloy modified with 2.4 wt.% Ce-rich and 0.3 wt.% Y-rich misch metals was prepared by high-pressure die-casting. The microstructure, thermal stability of intermetallic phases and mechanical properties were investigated. The cross-section of test bar is divided into the fine skin region and the wide core region by a narrow band. Two intermetallic phases Al_(11)RE_3 and Al_2RE, with the former being the dominant one, are mainly distributed at the interdendritic regions. The Al_(11)RE_3 intermetallics possess high volume fraction, fine acicular/lamellar morphology and layered arrangement. It is suggests that each rare earth element has the individual preference for the above two Al-RE intermetallics. The thermal stability of Al_(11)RE_3 is conditioned. It is basically stable at temperature up to 200 °C within 800 h, while almost all Al_(11)RE_3 intermetallics transform to Al_2RE at higher temperature of 450 °C for 800 h. The alloy exhibits remarkably improved tensile and compressive yield strengths at room temperature and 200 °C and they are the results of the reinforcement of dendrite boundaries with Al_(11)RE_3 intermetallics, the fine dendritic arm spacing effect as well as the solid solution strengthening with various rare earth elements.
机译：通过高压压铸制备了Mg-3.4wt。％的Al基合金，所述Al基合金用2.4wt。％的富Ce和0.3wt％的富Y的混合稀土金属改性。研究了金属间相的微观结构，热稳定性和力学性能。测试条的横截面通过窄带分为细皮区和宽芯区。金属间相Al_（11）RE_3和Al_2RE占主导地位，主要分布在枝晶间区域。 Al_（11）RE_3金属间化合物具有高体积分数，精细的针状/层状形态和分层排列。建议每种稀土元素对以上两种Al-RE金属间化合物有各自的偏好。 Al_（11）RE_3的热稳定性受到调节。它在800 h内最高200°C的温度下基本稳定，而几乎所有的Al_（11）RE_3金属间化合物在450°C的较高温度下800 h转变为Al_2RE。该合金在室温和200°C下具有显着改善的拉伸和压缩屈服强度，它们是Al_（11）RE_3金属间化合物增强枝晶边界，细化枝晶臂间距效应以及固溶强化的结果。各种稀土元素。

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