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Investigation on Microstructure and Properties of Al-7Si-0.6Mg-xFe Alloy by Wire Arc Additive Manufacturing (WAAM)
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Northeastern University

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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%.

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[Chengde Li, Huimin Gu, Wei Wang, Shuai Wang, Lingling Ren, Yuchun Zhai, Zhenbiao Wang, 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.]
DOI:10.12442/j. issn.1002-185X. E20190106

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History
  • Received:November 08,2019
  • Revised:April 17,2020
  • Adopted:November 19,2019
  • Online: July 09,2020
  • Published: