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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Elevated Temperature Properties of Die-cast AZ91-xNd Magnesium Alloys
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Microstructure and Elevated Temperature Properties of Die-cast AZ91-xNd Magnesium Alloys

机译：压铸AZ91-xNd镁合金的显微组织和高温性能

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摘要

The effect of Nd addition on the microstructure and mechanical properties of a die-cast AZ91 alloy was investigated in the present work. The results show that the die-cast AZ91 alloy is composed of α-Mg matrix and γ-Mg{sub}17Al{sub}12 phase. Nd addition into the AZ91 alloy leads to the formation of rare earth containing intermetallic phase. Al{sub}4Nd phase forms when Nd content is less than or equal to 1.0 wt.%. Al{sub}2Nd phase appears simultaneously when Nd content reaches to 3.0 wt.%. The size and volume fraction of γ-Mg{sub}17Al{sub}12 phase decrease, because of the newly formed Al-Nd phase. And the γ-Mg{sub}17Al{sub}12 phase distributes from reticular to dispersive. Nd addition has a little effect on the room temperature properties of the die-cast AZ91 alloy, but greatly improves the elevated temperature properties. The tensile strength of AZ91-0.5Nd and AZ91-1.0Nd alloy tested at 150 ℃ is even close to the room temperature strength. The AZ91-1.0Nd alloy has the optimal properties.
机译：在本工作中，研究了添加Nd对压铸AZ91合金的组织和力学性能的影响。结果表明，压铸AZ91合金由α-Mg基体和γ-Mg{sub} 17Al {sub} 12相组成。向AZ91合金中添加Nd会导致形成含稀土金属间相。当Nd含量小于或等于1.0重量％时，形成Al {sub} 4Nd相。当Nd含量达到3.0重量％时，Al {sub} 2Nd相同时出现。由于新形成的Al-Nd相，γ-Mg{sub} 17Al {sub} 12相的尺寸和体积分数减小。 γ-Mg{sub} 17Al {sub} 12相从网状分布到分散相。添加Nd对压铸AZ91合金的室温性能影响不大，但大大提高了高温性能。在150℃下测试的AZ91-0.5Nd和AZ91-1.0Nd合金的拉伸强度甚至接近室温强度。 AZ91-1.0Nd合金具有最佳性能。

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