3003铝合金/紫铜异种金属钎焊接头力学性能及显微组织
Mechanical property and microstructure of 3003 Al-alloy/Cu dissimilar metals brazed joint
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摘要: 研究了Zn-Al钎料钎焊3003铝合金/紫铜的铺展性能及钎焊接头力学性能. 结果表明,随着钎料中铝含量的增加,钎料在3003铝合金表面的铺展性能提高,铝含量增至10%~15%(质量分数)范围内时,钎料均具有优异的铺展性能,铝含量超过15%(质量分数)后,铺展性能下降. 钎料在紫铜表面的铺展面积随着钎料中铝含量的增加而增大. 钎焊接头力学性能试验表明,随着钎料中铝含量的增加,搭接钎焊接头抗剪强度提高,铝含量增至12%(质量分数)时,对应的钎焊接头强度最高,继续增加铝含量,钎焊接头强度降低. 综合考虑铺展性能及钎焊接头力学性能,88Zn-12Al钎料性能最佳.Abstract: 3003 Al alloy/Cu dissimilar metals were brazed by using Zn-Al filler metals with different Al contents. The spreadability of filler metal on 3003 Al-alloy substrate was improved with the increase of Al content. When Al content is in the range of 10%~15%, the filler metal presented excellent spreadability.However,the spreadability gradually decreased when Al content exceeds 15% in Zn-Al filler metal.In addition, the spreadability on pure copper substrate was improved with the increase of Al content. Shear strength of brazed joint was measured. The results show brazed joint strength was improved with the increase of Al content in the filler metal. When Al content is 12%, the shear strength reached highest and a sound brazed joints could be obtained. However,when Al content exceeds 12% in Zn-Al filler metal, the strength of brazed joint was gradually decreased. The optimum composition possessing best comprehensive properties is 88Zn-12Al filler metal.
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