Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第6期    总第219期    2017年6月

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文章编号:1004-0609(2017)-06-1176-06
铝合金/低碳钢点焊界面反应物生长机制
邱然锋1, 2,李久勇1,贺玉刚1,石红信1, 2,SATONAKA S3

(1. 河南科技大学 材料科学与工程学院,洛阳 471023;
2. 有色金属共性技术河南省协同创新中心,洛阳 471023;
3. 日本熊本大学 自然科学研究科,熊本 860-8555
)

摘 要: 采用电阻点焊对铝合金与低碳钢进行焊接,分析了接合界面区反应层形貌及分布等显微组织特征。结果表明:在接合界面上观察到反应物层的生成,其厚度随位置的变化而变化;界面反应物是由靠近铝合金侧的反应物为FeAl3和靠近钢侧反应物为Fe2Al5构成;FeAl3的生成归结于其生成自由能较低,而Fe2Al5的生长主要因其结构上在c轴方向存有大量Al原子空位而造成的各向异性扩散。

 

关键字: 铝合金;钢;反应物;点焊

Growth mechanism of reactants at spot welding interface between aluminum alloy and low carbon steel
QIU Ran-feng1, 2, LI Jiu-yong1, HE Yu-gang1, SHI Hong-xin1, 2, SATONAKA S3

1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;
2. Collaborative Innovation Center of Nonferrous Metals, Luoyang 471023, China;
3. Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan

Abstract:Aluminum alloy and low carbon steel sheets were welded by resistance spot welding. The interfacial characterization was observed and analyzed. The results show that a reactant layer forms at the welding interface; its thickness varies with the position at the welding interface. A reactant layer consisting of Fe2Al5 adjacent to steel and FeAl3 adjacent to aluminum alloy forms in the welding interface. Low free energy of FeAl3 is considered to be the reason for its formation at the welding interface, whereas anisotropic diffusion, which resulted from large number of aluminum vacancies along the c-axis of the orthorhombic structure of Fe2Al5, is a reason for the growth of Fe2Al5.

 

Key words: aluminum alloy; steel; reactants; spot welding

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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