Abstract Selective laser melting (SLM) of Mg-Al powder mixture is a promising method to additively manufacture Mg-Al alloy components without using pre-alloyed powder as feedstock. However, the microstructure and consequent tensile properties of SLMed Mg-9 wt%Al powder mixture have not been systematically investigated. In this work, spherical Mg and Al powder with a weight ratio of 91:9 were mixed using ball milling and the mixture was SLMed at different processing parameters. Mg-Al alloy was successfully fabricated and the highest relative density achieved was 95.7%. The results of scanning electron microscopy showed that the microstructure and volume of defects could be controlled by tuning the processing parameters. The highest ultimate tensile strength achieved was 274 MPa, which was comparable to the strength of SLMed pre-alloyed Mg-9 wt%Al as reported in literature. Based on this study, SLM of different Mg powder mixture can be investigated in future.

中文翻译：

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选择性激光熔化Mg-9wt.%Al粉末混合物的组织和力学性能

摘要 Mg-Al 粉末混合物的选择性激光熔化 (SLM) 是一种很有前景的方法，可以在不使用预合金粉末作为原料的情况下增材制造 Mg-Al 合金部件。然而，尚未系统地研究 SLMed Mg-9 wt% Al 粉末混合物的微观结构和随之而来的拉伸性能。在这项工作中，使用球磨混合重量比为 91:9 的球形镁和铝粉末，并在不同的加工参数下对混合物进行 SLM。Mg-Al合金制备成功，最高相对密度达到95.7%。扫描电子显微镜的结果表明，可以通过调整加工参数来控制缺陷的微观结构和数量。达到的最高极限拉伸强度为 274 MPa，这与文献中报道的 SLMed 预合金 Mg-9 wt% Al 的强度相当。基于这项研究，未来可以研究不同镁粉混合物的 SLM。