2Si脫溶而形成π-Fe相。隨著Fe含量的增加,合金中的富Fe相的尺寸增大、數(shù)量增多。Fe含量在較小的范圍內(nèi)變化即可對WAAM成形合金的延伸率產(chǎn)生較大影響,而對強度作用不明顯,當(dāng)Fe含量由0.11%增加到0.18%,合金的斷裂延伸率降低了47.1%。"/>

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電弧增材制造(WAAM)Al-7Si-0.6Mg-xFe組織與性能的研究
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1.東北大學(xué);2.內(nèi)蒙古金屬材料研究所;3.撫順東工冶金材料技術(shù)有限公司

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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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    摘要:

    本文研究了Fe含量對WAAM Al-7Si-0.6Mg合金組織與性能的影響,并觀察了合金中富Fe相形貌和分布。結(jié)果表明,WAAM成形試樣中富Fe相為細(xì)小針狀,為亞穩(wěn)態(tài)鎂硅相和π-Fe相的混合相。經(jīng)T6熱處理后,富Fe相中Mg2Si脫溶而形成π-Fe相。隨著Fe含量的增加,合金中的富Fe相的尺寸增大、數(shù)量增多。Fe含量在較小的范圍內(nèi)變化即可對WAAM成形合金的延伸率產(chǎn)生較大影響,而對強度作用不明顯,當(dāng)Fe含量由0.11%增加到0.18%,合金的斷裂延伸率降低了47.1%。

    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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李承德,顧惠敏,王 偉,王 帥,任玲玲,翟玉春,王振飚,明 珠.電弧增材制造(WAAM)Al-7Si-0.6Mg-xFe組織與性能的研究[J].稀有金屬材料與工程,2020,49(6):1860~1866.[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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  • 收稿日期:2019-11-08
  • 最后修改日期:2020-04-17
  • 錄用日期:2019-11-19
  • 在線發(fā)布日期: 2020-07-09
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