压铸态镁/铝异种合金搅拌摩擦焊接接头组织及性能
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摘要
对3 mm厚压铸态AZ91D镁合金和压铸态ADC12铝合金进行了结果表明搅拌摩擦焊,采用金相显微镜、扫描电镜、X射线衍射、万能试验机等分析了接头的微观组织和力学性能。结果表明:铝合金置于前进侧,前进速度为40 mm/min,转速为900～1300 r/min时,可获得成形良好的焊接接头;接头焊核区域镁铝合金相互混合,发生机械互锁,组织呈现条带状特征;母材中粗大铸态枝晶明显细化,非镁/铝基体相主要有Si、Mg_2Al_3、Mg_(17)Al_(12)和Mg_2Si,颗粒状尺寸随转速的增加呈先降后增趋势;接头平均抗拉强度随转速增加呈现先增大后减小的趋势;断裂均发生在前进侧热机影响区和焊核的交界处。关键词:搅拌摩擦焊;微观组织;力学性能;压铸镁合金;压铸铝合金
The high-pressure die castings of AZ91 Mg and ADC 12 Al alloys of 3 mm in thickness were welded by frciton stir welding. OM SEM/EDS, XRD and universal tensile testing machine were used to analyze the microstructure and tensile property of the joint. Results show that defect-free welded joints are obtained when ADC 12 die-casting aluminum alloy is placed in the advancing side with a welding speed of 40 mm/min and the rotational speeds of 900～1300 r/min. Mg and Al alloys are mixed with each other in the nugget zone, and mechanical interlocking occurs. In the parent material, the thick and large casting dendrites are obviously refined, and the non-Mg/Al matrix phases mainly include Si,Mg_2 Al_3,Mg_(17)Al_(12) and Mg_2 Si,whose particle size decreases first and then increases with the rotational speed increasing. The average tensile strength of the joints increases first and then decreases with the increasing rotating speed. Fracture occurs at the interface of the thermal affceted zone and the nugget zone in the advancing side.
The high-pressure die castings of AZ91 Mg and ADC 12 Al alloys of 3 mm in thickness were welded by frciton stir welding. OM SEM/EDS, XRD and universal tensile testing machine were used to analyze the microstructure and tensile property of the joint. Results show that defect-free welded joints are obtained when ADC 12 die-casting aluminum alloy is placed in the advancing side with a welding speed of 40 mm/min and the rotational speeds of 900～1300 r/min. Mg and Al alloys are mixed with each other in the nugget zone, and mechanical interlocking occurs. In the parent material, the thick and large casting dendrites are obviously refined, and the non-Mg/Al matrix phases mainly include Si,Mg_2 Al_3,Mg_(17)Al_(12) and Mg_2 Si,whose particle size decreases first and then increases with the rotational speed increasing. The average tensile strength of the joints increases first and then decreases with the increasing rotating speed. Fracture occurs at the interface of the thermal affceted zone and the nugget zone in the advancing side.
引文
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[3]Karam A,Mahmoud T S,Zakaria H M et al.Arabian Journal for Science and Engineering[J],2014,39:6363
[4]Rhaghayeghi.Transactions of Nonferrous Metals Society of China[J],2017,27(2):282
[5]Wang Xiangjie(王向杰),You Guoqiang(游国强),Zhang Juncheng(张均成)et al.Acta Metallica Sinica(金属学报)[J],2012,48(12):1437
[6]Wang Xiangjie(王向杰),You Guoqiang(游国强),Yang Zhi(杨智)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2012,41(12):2144
[7]Fritzsche A,Kai H,Teichmann F et al.Journal of Materials Processing Technology[J],2018,253:51
[8]Shan Jiguo(单际国),Zhang Jing(张婧),Zheng Shiqing(郑世卿)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2009,38(3):234
[9]Mohammadi J,Behnamian Y,Mostafaei A et al.Materials Characterization[J],2015,101:189
[10]Dorbane A.Materials Science&Engineering A[J],2016,651:720
[11]Sheikh-Ahmad J Y,Ozturk F,Jarrar F et al.International Journal of Advanced Manufacturing Technology[J],2016,86(1-4):1071
[12]Kwon Y J,Shigematsu I,Saito N.Materials Letters[J],2008,62(23):3827
[13]Wang Dong(王东),Liu Jie(刘杰),Xiao Boluo(肖伯律)et al.Acta Metallica Sinica(金属学报)[J],2010,46(5):589
[14]Shi H,Chen K,Liang Z et al.Journal of Materials Science&Technology[J],2017(4):359
[15]Kim Y G,Fujii H,Tszumura T et al.Materials Letters[J],2006,60(29):3830
[16]Luan Guohong(栾国红),Ma Xiangsheng(马翔生),Ji Yajuan(季亚娟).Proceedings of the Eleventh National Welding Conference(全国焊接会议)[C].Shanghai:China Mechanical Engineering Society,2005:564
[17]You Guoqiang(游国强),Zhang Juncheng(张均成),Tan Xia(谭霞).Journal of Materials Engineering(材料工程)[J],2014(2):29
[18]Kumar K,Satish V Kailas.Materials Science and Engineering A[J],2008,485:367
[19]Fu Banglong,Qin Guoliang,Li Fei et al.Journal of Materials Processing Technology[J],2015,218:38
[20]Klag O,Groebner J,Wagner G et al.International Journal of Materials Research[J],2014,105(2):145