稀土Er对Al-Si-Cu钎料显微组织与性能的影响

Effect of Rare Earth Element Er on Microstructure and Properties of AlSi-Cu Solder Alloy

为了研究微量稀土元素Er对Al-7Si-20Cu钎料合金性能的影响，进行了不同wE4对Al-7Si-20Cu合金熔化温度、润湿性能及力学性能的试验研究．结果表明，添加微量Er对Al-Si-Cu钎料合金的熔化温度无显著影响，但显著提高Al-Si-Cu钎料合金对被焊基体铝合金（LF21）的润湿能力。尤其是当wEr为0．05％～0．1％时最为显著．显微组织分析表明，随着wE4的增加，钎料显微组织细化，特别是针状共晶Si的长度逐渐减小．

In order to improve the properties of the brazing alloy Al-7Si-20Cu, a small amount ot rare earth （RE） Er was added into Al-7Si-20Cu brazing alloy aiming at examining the effect of different amounts of Er on the physical properties, spreading property and mechanical properties of the solders. Results show that a small amount of Er has no obvious effect on the melting temperature of Al-Si-Cu solder alloy, but can notably improve spreading property of brazing alloy on LF21 surface, especially when the content of Er is within 0.05-0.1%. According to the examination on the microstructure of AISiCu brazing alloy, with the increase of Er content the microstructure becomes finer and the length of acicular eutectic Silicon is shortening.