Fe-Al金属间化合物对铝/钢钎焊接头力学性能的影响

研究了Zn-Al钎料钎焊铝/钢接头的铺展性能、钎焊接头力学性能与显微组织. 铺展试验结果表明，随着钎料中铝含量的增加，钎料在3003铝合金、Q235钢表面的铺展面积均增大，铝含量为15%(质量分数)时，在3003铝合金与Q235钢表面的铺展面积均达到最大值，继续增加铝含量，钎料铺展性能降低. 钎焊接头力学性能试验结果表明，随着钎料中铝含量的增加，钎焊接头强度提高，铝含量为12%(质量分数)时，88Zn-12Al钎料铝/钢钎焊接头强度最高，继续增加铝含量，钎焊接头强度降低. 综合考虑铺展性能及接头力学性能，88Zn-12Al钎料钎焊铝/钢接头性能最佳.

Effect of Fe-Al intermetallic compound on mechanical property of aluminum/steel brazed joint

3003 Al-alloy/Q235 steel dissimilar metals were brazed by Zn-Al filler metals with different Al contents. The spreading experiment results indicate that the spreadability improves with the increase of Al content in the filler metal on 3003 Al-alloy substrate and Q235 steel substrate. When Al content is 15%, the filler metal presents the best spreadability on 3003 Al-alloy substrate and Q235 steel substrate．However，the spreadability gradually deteriorates when Al content exceeds 15% in Zn-Al filler metal. In addition, the shear strength of the brazed joint was measured. The results show the joint strength improves with the increase of Al content in the filler metal. When Al content is 12%, the shear strength of the brazed joint gets highest. However，when Al content exceeds 12% in Zn-Al filler metal, the joint strength gradually decreases. The optimum content possessing best comprehensive properties is 88Zn-12Al filler metal.