Comparative study of performance comparison of AlSi10Mg alloy prepared by selective laser melting and casting
Comparative study of performance comparison of AlSi10Mg alloy prepared by selective laser melting and casting
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DOI：
10.1016/j.jmst.2019.08.049
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发表时间：
2020-03-15
影响因子：
10.9
通讯作者：
Shi, Yusheng
中科院分区：
文献类型：
--
作者：
Yan, Qian;Song, Bo;Shi, Yusheng
研究了铸造法和选区激光熔化法（SLM）制备的AlSi 10 Mg合金的显微组织对力学性能的影响，并进行了对比分析，重点探讨了AlSi 10 Mg合金的形成机理。采用扫描电子显微镜/场发射透射电子显微镜（SEM/TEM）、X射线衍射仪（XRD）、拉伸试验和疲劳试验对复合材料的显微组织、相结构和力学性能进行了表征。结果表明，SLMAlSi 10 Mg具有沿着α-Al晶胞析出的过饱和Si网络结构。由于不同的热历史，铸态和SLM AlSi 10 Mg中分别出现了脆性的β-Al 5 FeSi相和π-Al 8 FeMg 3 Si 6相。结果表明，SLM AlSi 10 Mg合金的抗拉强度比铸态高，但延伸率比铸态低，这主要是由于晶粒细化和裂纹路径曲折所致，而未熔粉末、氧化物夹杂和气孔等缺陷严重影响了SLM AlSi 10 Mg合金的疲劳性能。SLM工艺提供了一种新的材料加工方法，可以避免有害的含铁金属间化合物，并细化微观结构以提高强度。(C)2020由Elsevier Ltd代表Journal of Materials Science & Technology编辑部出版。
The influence of the microstructure on mechanical properties of AlSi10Mg fabricated by casting and selective laser melting (SLM) were investigated and contrasted in this work, with an emphasis on understanding the forming mechanism. The microstructure, phase structure and mechanical properties were characterized by scanning electron microscopy/field-emission Transmission Electron Microscopy (SEM/TEM), X-Ray Diffraction (XRD), tensile and fatigue tests. The results indicated that the SLMAlSi10Mg exhibited a supersaturated Si network structure precipitated along alpha-Al cell. Brittle beta-Al5FeSi and pi-Al8FeMg3Si6 phases were found in the as-cast and SLM AlSi10Mg respectively due to different thermal histories during processing. The SLM AlSi10Mg showed higher tensile strength but lower elongation than the casting, as the result of grain refinement and tortuous crack path. The fatigue results revealed that unmelted powder, oxide inclusion and pores can considerably degrade the fatigue properties for the SLM AlSi10Mg. The SLM process offered a new method for material processing that would avoid harmful Fe-bearing intermetallic compounds and refine the microstructures for enhancing strength. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.