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Effects of magnesium on the microstructure and properties of Al–Si alloy deposited by wire and arc-based additive manufacturing
Materials Technology ( IF 3.1 ) Pub Date : 2020-07-27 , DOI: 10.1080/10667857.2020.1797284
Chengde Li 1 , Huimin Gu 1 , Wei Wang 2 , Shuai Wang 1 , Lingling Ren 1 , Zhenbiao Wang 3 , Zhu Ming 2 , Yuchun Zhai 1, 3
Affiliation  

ABSTRACT

The effects of Mg on microstructure, defects and properties of Al–Si alloy deposited by Wire and Arc-based Additive Manufacturing (WAAM) were investigated. The WAAM alloys were characterised by the metallographic microscope, X-ray diffraction, scanning electron microscope, computed tomography and electronic universal testing machine. The results show that the secondary dendrite arm spacing (SDAS) and hydrogen content of as-deposited WAAM alloy increase, and the tendency of pore formation increases with an increase in Mg content. The impurity Fe in the WAAM alloy with low Mg content is mainly in β-Fe phase, while with high Mg content is mainly in the π-Fe phase. After solution treating and ageing treatment (T6 heat-treat), the microstructure of WAAM alloy tends to be uniform. With the increase of Mg content, the size of eutectic silicon particles increases gradually. Furthermore, the UTS and YS of the alloys increased, and the elongation decreased.



中文翻译:

镁对丝材和电弧增材制造Al-Si合金显微组织和性能的影响

摘要

研究了镁对线材和电弧增材制造 (WAAM) 沉积的 Al-Si 合金组织、缺陷和性能的影响。通过金相显微镜、X射线衍射、扫描电子显微镜、计算机断层扫描和电子万能试验机对WAAM合金进行了表征。结果表明,沉积态WAAM合金的二次枝晶臂间距(SDAS)和氢含量增加,且随着Mg含量的增加,气孔形成趋势增加。低Mg含量WAAM合金中的杂质Fe主要以β-Fe相为主,而高Mg含量以π-Fe相为主。经过固溶和时效处理(T6热处理),WAAM合金的显微组织趋于均匀。随着 Mg 含量的增加,共晶硅颗粒的尺寸逐渐增大。此外,合金的 UTS 和 YS 增加,伸长率降低。

更新日期:2020-07-27
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