锆元素对Zn-15Al钎料组织和性能的影响
Effect of zirconium on microstructure and properties of Zn-15Al filler metal
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摘要: 通过扫描电镜、X射线衍射和纳米压痕等方法研究了微量Zr元素对铝合金/不锈钢异种金属钎焊用Zn-15Al钎料显微组织和性能的影响.结果表明，微量Zr元素的添加对钎料的熔点没有明显影响.Zr元素对Zn-15Al钎料基体中η-Zn相有明显细化作用，当Zr元素的质量分数为0.2%时，细化效果最佳；Zr元素的添加量过多时，钎料中形成块状的Al2ZnZr化合物.当Zr元素的质量分数为0.2%时，Zn-15Al-0.2Zr钎料在不锈钢和铝合金母材上的铺展面积较Zn-15Al钎料分别提高了15.9%和10.2%，钎焊接头抗剪强度达到最大值143 MPa.Zn-15Al，Zn-15Al-0.2Zr，Zn-15Al-0.3Zr 3种钎料的蠕变应力指数分别为6.64，7.35，8.07.Abstract: The microstructure and properties of Zn-15Al filler metal used for brazingof aluminum/stainless steel were investigated by means of scanning electron microscope, X-ray diffraction and nanoindentation. The results indicate that Zr addition hasfew influences on the melting point of the Zn-15Al filler metal. Moreover, the addition ofthe appropriate amount of Zr appears to refine the η-Zn dendrites in the filler metal. However, the excessive amount of Zr leads to the formation of Al2ZnZr compounds. The spreadability of the Zn-15Al-xZr filler metal is improved especially at the Zrcontent of 0.2 wt.%, which the spreading areason stainless steel and aluminum alloy are increased by 15.9% and 10.2%, respectively. The shear strength of the Zn-15Al-0.2Zr brazed joint achieves the peak value of 143 MPa. The creep stress exponents of Zn-15Al, Zn-15Al-0.2Zr and Zn-15Al-0.3Zr are 6.64, 7.35 and 8.07, respectively.
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Keywords:
- zirconium /
- Zn-Al filler metal /
- microstructure /
- spreading ability
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