Fe含量对电弧增材制造Al-7Si-0.6Mg合金组织与性能的影响  

Effects of Fe Content on Microstructure and Properties of Al-7Si-0.6Mg Alloy Fabricated by Wire Arc Additive Manufacturing

作　　者：李承德[1] 顾惠敏[2] 王伟 王帅[2] 任玲玲[2] 翟玉春[2,4] 王振飚 明珠 Li Chengde;Gu Huimin;Wang Wei;Wang Shuai;Ren Lingling;Zhai Yuchun;Wang Zhenbiao;Ming Zhu(Northeastern University,Shenyang 110004,China;Inner Mongolia Metal Material Research Institute,Ningbo 315103,China;North East Industrial Materials&Metallurgy Co.,Ltd.,Fushun 113200,China;School of Metallurgy,Northeastern University,Shenyang 110004,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110004 [2]东北大学,辽宁沈阳110004 [3]内蒙古金属材料研究所,浙江宁波315103 [4]抚顺东工冶金材料技术有限公司,辽宁抚顺113200

出　　处：《稀有金属材料与工程》2020年第6期1860-1866,共7页Rare Metal Materials and Engineering

基　　金：National Key Research and Development Program of China(2018YFB1106300-5)。

摘　　要：研究了Fe含量对电弧增材制造(WAAM)Al-7Si-0.6Mg合金组织与性能的影响,并观察了合金中富Fe相形貌和分布。结果表明,WAAM成形试样中富Fe相为细小针状,为亚稳态镁硅相和π-Fe相的混合相。经T6热处理后,富Fe相中Mg2Si脱溶而形成π-Fe相。随着Fe含量的增加,合金中富Fe相的尺寸增大、数量增多。Fe含量在较小的范围内变化即可对WAAM成形合金的延伸率产生较大影响,而对强度作用不明显,当Fe含量由0.109%(质量分数)增加到0.177%,合金的断裂延伸率降低了47.1%。The effect of Fe addition on the structure and properties of Al-7Si-0.6Mg alloy fabricated 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 finely acicular Fe-rich phase in as-deposited alloys is a mixture of metastable Mg-Si phase andπ-Fe phase.After heat treatment(T6),Mg2Si dissolves from Fe-rich phase and formsπ-Fe phase.With the increase of Fe addition,the size and quantity of Fe-rich phase in the alloy increase.The small change of Fe-content can have a great effect on the elongation of WAAM alloy(T6),but it has no obvious effect on strength.As the Fe content increases from 0.109 wt%to 0.177 wt%,the fracture elongation of the alloy decreases by 47.1%.

关 键 词：电弧增材制造(WAAM) Al-7Si-0.6Mg 组织与性能 π-Fe相 

分 类 号：TG146.21[一般工业技术—材料科学与工程]