Influence of Zr addition on TIG welding–brazing of Ti–6Al–4V toAl5A06
Influence of Zr addition on TIG welding–brazing of Ti–6Al–4V toAl5A06
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DOI：
10.1016/j.msea.2013.01.047
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发表时间：
2013-04
期刊：
影响因子：
6.4
通讯作者：
S. Lv;Cui Qinglong;Yongxian Huang;J. Xiaojun
中科院分区：
文献类型：
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作者：
S. Lv;Cui Qinglong;Yongxian Huang;J. Xiaojun
研究了纯Al和Al-Cu-Zr钎料对Ti-6Al-4V与Al5A06合金的TIG焊-钎焊性能。在TIG加热条件下，添加Zr和Cu提高了Al基钎料在Ti-6Al-4V基片上的铺展性能，获得了良好的Ti/Al异种对接接头。在低热输入条件下，在Ti/Seam界面观察到厚度为2~4μm的不连续TiAl_3层，在高热输入条件下，TiAl_3+L-(Ti，Zr)Al_3+H-(Ti，Zr)Al_3+H-(Ti，Zr)Al_3多亚层取代了这种不连续的TiAl_3层。与纯Al焊料相比，Al-Cu-Zr焊料焊接接头具有更高的拉伸性能和更宽的工艺参数。Al-Cu-Zr钎料焊接接头的最大抗拉强度达到284 Mpa，达到母材Al5A06合金的85%，断裂方式为TiAl3亚层的准解理断裂。添加Zr有利于提高钛基材的铺展性能，并拓宽了焊接工艺参数。
TIG welding–brazing of Ti–6Al–4V to Al5A06 alloys with pure Al and Al–Cu–Zr fillers was investigated. The Zr and Cu additions enhanced the spreadability of Al-based fillers on Ti–6Al–4V substrate under TIG heating condition, and a sound Ti/Al dissimilar butt joint was obtained. Influenced by Zr addition, a discontinuous TiAl3layer with a thickness of 2–4μm was observed at the Ti/seam interface under a low heat input condition, which was replaced by TiAl3+L–(Ti,Zr)Al3+H–(Ti,Zr)Al3multi-sublayers when a high heat input was adopted. The joint with Al–Cu–Zr filler has higher tensile property and wider processing parameters than that with pure Al filler. The largest tensile strength of the joint produced by Al–Cu–Zr filler reaches 284MPa up to 85% of base Al5A06 alloys, and the fracture occurred by quasi-cleavage mode at the TiAl3sublayer. Zr addition was favorable to enhance the spreadability on Ti substrate, and the welding processing parameters were broadened by the presence of Zr addition.