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李承德,顾惠敏,王 伟,王 帅,任玲玲,翟玉春,王振飚,明 珠.电弧增材制造(WAAM)Al-7Si-0.6Mg-xFe组织与性能的研究[J].稀有金属材料与工程(英文),2020,49(6):1860~1866.[Chengde Li,Huimin Gu,Wei Wang,Shuai Wang,Lingling Ren,Yuchun Zhai,Zhenbiao Wang and Zhu Ming.Investigation on Microstructure and Properties of Al-7Si-0.6Mg-xFe Alloy by Wire Arc Additive Manufacturing (WAAM)[J].Rare Metal Materials and Engineering,2020,49(6):1860~1866.]
Investigation on Microstructure and Properties of Al-7Si-0.6Mg-xFe Alloy by Wire Arc Additive Manufacturing (WAAM)
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Received:November 08, 2019  Revised:April 17, 2020
DOI:
Key words: wire arc additive manufacturing (WAAM), Al-7Si-0.6Mg alloy, microstructure and properties, π-Fe phase
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Chengde Li,Huimin Gu,Wei Wang,Shuai Wang,Lingling Ren,Yuchun Zhai,Zhenbiao Wang and Zhu Ming  
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Abstract:
      The effect of Fe additions on the structure and properties of Al-7Si-0.6Mg alloy by wire arc additive manufacturing (WAAM) was studied and the morphology and distribution of Fe-rich phase in the alloy were observed. The results show that the fine acicular Fe-rich phase in as-deposition alloys is a mixture of metastable Mg-Si phase and π-Fe phase. After heat treatment (T6), Mg2Si dissolves from Fe-rich phase and forms π-Fe phase. With the increase of Fe additions, the size and quantity of Fe-rich phase in the alloy increase. The change of Fe-content in a small range can have a great effect on the elongation of WAAM alloy (T6), but has no obvious effect on strength. With the additions of Fe increases from 0.11% to 0.18%, the fracture elongation of the alloy decreases by 47.1%.