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研究了稀土La对(Ag-Cu28)-25Sn-xLa合金微观结构的影响,并探讨了稀土La含量的变化在其凝固过程中的作用。采用高频感应加热熔炼,经水淬制得(Ag-Cu28)-25Sn-xLa合金。通过XRD,SEM,EDS等分析手段,研究了合金的物相组成、凝固组织及元素分布情况。研究结果表明:微量的稀土La足以改变(Ag-Cu28)-25Sn合金的凝固过程;La含量不大于0.5%时,合金的物相组成为Ag3Sn,Cu3Sn和Cu6Sn5相;当La含量不小于1.0%(质量分数)时,合金的物相组成为Ag3Sn和Cu3Sn;同时,随La含量的增加合金的凝固组织不断细化,且有利于Ag(Sn)固溶体初生相的析出。
The effects of rare earth La on the microstructure of (Ag-Cu28) -25Sn-xLa alloy were investigated. The effect of rare earth La content on the solidification process was also discussed. High-frequency induction heating melting, water quenching (Ag-Cu28) -25Sn-xLa alloy. The phase composition, solidification structure and elemental distribution of the alloy were studied by XRD, SEM and EDS. The results show that the rare earth La is enough to change the solidification process of (Ag-Cu28) -25Sn alloy. When the content of La is less than 0.5%, the phase composition of the alloy is Ag3Sn, Cu3Sn and Cu6Sn5. When La content is not less than 1.0% (Mass fraction), the phase composition of the alloy is Ag3Sn and Cu3Sn. Meanwhile, with the increase of La content, the solidified microstructure of the alloy is refined and the precipitation of primary phase of Ag (Sn) solid solution is facilitated.