Zn-Al钎料钎焊6063铝合金铺展性能及接头断裂机理分析
Spreadability of Zn-Al filler metal and fracture mechanism of 6063 Al-alloy brazed joint
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摘要: 研究了Zn-Al钎料钎焊6063铝合金的铺展性能及接头断裂机理.钎料铺展试验表明,随着钎料中铝含量的增加,钎料铺展面积增大,铝含量增至22%(质量分数)时,钎料铺展面积达到最大,继续增加铝含量,铺展面积减小.钎焊接头力学性能试验表明,随着钎料中铝含量的增加,铝基固溶体强化相数量增加,搭接钎焊接头强度提高,铝含量增至22%(质量分数)时,钎焊接头强度达到最高,继续增加铝含量,钎缝内枝状共析组织变得粗大,与其周围组织之间容易产生应力集中,萌生裂纹,钎焊接头强度降低.综合考虑钎料的铺展性能以及钎焊接头力学性能,78Zn-22Al钎料钎焊6063铝合金性能最佳.Abstract: The spreadability of Zn-Al filler metal on 6063 Al-alloy surface were investigated, moreover, the strength and microstructure of 6063 Al-alloy lap-joints were studied. The results indicated that spreadability was improved with the increase of Al content in filler metal. When Al content was 22%, the filler metal got the best spreadability on 6063 Al-alloy surface. However, the spreadability decreased when Al content exceeded 22%. Furthermore, the brazed lap-joint mechanical property test results indicated that the strength of 6063 Al-alloy lap-joint was enhanced with the increase of Al content in filler metal. The highest strength of brazed joint was obtained when Al content is 22%, however, when Al content exceeded 22%, the dentritic eutectoid structure became larger in the brazing joint. Stress concentration emerged easily between large dendritic eutectoid structure and the surrounding structure. And the strength of brazed joint decreased gradually. The optimum fill metal possessing best comprehensive properties is 78Zn-22Al filler metal.
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Keywords:
- Zn-Al filler metal /
- brazing /
- 6063 Al-alloy /
- spreadability /
- mechanical property
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