铝合金/低碳钢点焊界面反应物生长机制  

Growth mechanism of reactants at spot welding interface between aluminum alloy and low carbon steel

作　　者：邱然锋[1,2] 李久勇 贺玉刚 石红信[1,2] SATONAKA S 

机构地区：[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,熊本860-8555

出　　处：《中国有色金属学报》2017年第6期1176-1181,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(U1204520);河南省高校创新人才支持计划资助项目(16HASTIT050);河南省国际科技合作计划资助项目(162102410023);河南省高等学校青年骨干教师资助计划项目(2013GGJS-064)~~

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FeAl_3和靠近钢侧反应物为Fe_2Al_5构成;FeAl_3的生成归结于其生成自由能较低,而Fe_2Al_5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。Aluminum alloy and low carbon steel sheets were welded by resistance spot welding. The interracial 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.

关 键 词：铝合金 钢 反应物 点焊 

分 类 号：TG441.2[金属学及工艺—焊接]