Zr对Ag-Cu-Ti钎料合金显微组织与力学性能的影响

Effect of Zr addition on microstructure and mechanical properties of Ag-Cu-Ti solder alloys

通过非自耗电弧熔炼与氩气保护浇铸,制备Ag-50Cu-4Ti基钎料合金。采用差热分析(DSC)、X射线衍射(XRD)、显微组织观察及力学性能测试方法,研究Zr含量对基体钎料合金显微组织与力学性能的影响。结果表明,Zr含量的增加并不明显影响钎料合金的熔化温度,其熔点均为783℃左右。随Zr含量的提高,基体合金的显微组织发生明显变化,Zr的添加可降低基体合金中针状Cu3Ti相的体积分数与尺寸,促进弥散分布的(Cu,Ag)5(Ti,Zr)相形成,从而提高合金的维氏硬度与剪切强度。高温氧化实验表明,含Zr合金表现出相对基体合金更为优异的高温抗氧化性能。

Ag-50Cu-4Ti solder alloys with different Zr contents were synthesized by non-consumable arc melting in argon atmosphere. Effect of Zr addition on microstructure and mechanical properties of the as-cast alloy was investigated by differential scanning calorimeter, X-ray diffraction, microscope and mechanical properties testing. The results show that Zr addition can not affect the melting point of the Ag-50Ti-4Ti alloy obviously. The melting points of the alloys are all about 783 ~C. Adding Zr can reduce volume fraction and size of the needle-like Cu3Ti phase, promote the uniform distribution of new phase （Cu,Ag）s（Ti,Zr）, and improve the Vickners hardness and shear s^ength of the base alloys. High-temperature oxidation experiment results show that Ag-50Cu-4Ti alloy added Zr has better high-temperature oxidation resistant property than that of the alloy without Zr.