Interface microstructure and formation mechanism of ultrasonic spot welding for Al-Ti dissimilar metals
Interface microstructure and formation mechanism of ultrasonic spot welding for Al-Ti dissimilar metals
复制标题
DOI：
10.1007/s12613-020-2043-y
复制
发表时间：
2021-09
期刊：
影响因子：
--
通讯作者：
L. Zhou;Shanliangzui Liu;J. Min;Zhicong Qin;Wen-xiong He;Xiaoguo Song;Hongshen Xu;Jicai Feng
中科院分区：
文献类型：
--
作者：
L. Zhou;Shanliangzui Liu;J. Min;Zhicong Qin;Wen-xiong He;Xiaoguo Song;Hongshen Xu;Jicai Feng
目前的研究重点是界面微观结构和接头形成。采用超声点焊方法对AA 6061铝合金与工业纯钛进行了焊接。焊接能量为1100-3200 J。采用光学显微镜和场发射扫描电镜对接头形貌和界面组织进行了观察。结果表明，只有在2150 J的焊接能量下才能获得良好的接头，在所有条件下均未发现明显的金属间化合物（IMC）。动力学分析表明，Al-Ti的高能垒和扩散困难是导致未形成IMC的主要原因。热输入对材料的塑性流动和结合面积至关重要，对接头的形成起着重要作用。
The present study focuses on interface microstructure and joint formation. AA6061 aluminum alloy (Al) and commercial pure titanium (Ti) joints were welded by ultrasonic spot welding (USW). The welding energy was 1100–3200 J. The Al-Ti joint appearance and interface microstructure were observed mainly via optical microscopy and field emission scanning electron microscopy. Results indicated that a good joint can be achieved only with proper welding energy of 2150 J. No significant intermetallic compound (IMC) was found under all conditions. The high energy barriers of Al-Ti and difficulties in diffusion were the main reasons for the absence of IMC according to kinetic analysis. The heat input is crucial for the material plastic flow and bonding area, which plays an important role in the joint formation.