Au-Pt-Sn三元合金相图的700 ℃等温截面|胡洁琼,谢明,陈松,陈永泰,王松,王塞北-《中国有色金属学报》官方网站|全网首发|论文开放获取

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第29卷第3期总第240期 2019年3月

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文章编号：1004-0609(2019)-03-0538-11

Au-Pt-Sn三元合金相图的700 ℃等温截面

胡洁琼^{1, 2}，谢明^{1, 2}，陈松^{1, 2}，陈永泰^{1, 2}，王松²，王塞北^{1, 2}

(1. 昆明理工大学材料科学与工程学院，昆明 650093；
2. 昆明贵金属研究所，昆明 650106)

摘要: 采用 X 射线衍射仪(XRD)和电子探针显微分析仪(EPMA)等方法测定了Au-Pt-Sn 三元系 700 ℃等温截面。结果表明：Au-Pt-Sn 体系 700 ℃等温截面由3个单相区、7个两相区和6个三相区组成。6个三相区分别为Pt₃Sn+FCC-A1+PtSn、PtSn+FCC-A1+Au₅Sn、PtSn+Pt₃Sn+Au₅Sn、Pt₃Sn+FCC-A1+Au₅Sn、PtSn+Pt₂Sn₃+Liquid和PtSn+FCC-A1+Liquid。Au-Pt-Sn体系中存在Au-Pt合金的调幅分解反应，随着Pt含量的减少，合金中调幅分解相逐渐消失，在Au₁₆Pt₃₀Sn₅₄和Au₁₆Pt₂₀Sn₆₄合金中完全消失。由于Pt-Sn合金相的熔点较Au-Sn合金的相高，所以在700 ℃等温截面，大都只存在Pt-Sn合金相，而Au-Sn合金相大都只存在于液相中。合金Au₁₆Pt₆₉Sn₁₅、Au₁₆Pt₅₄Sn₃₀和Au₁₆Pt₄₂Sn₄₂由于存在调幅分解相，组织分布较均匀，其强度明显比合金Au₁₆Pt₃₀Sn₅₄和Au₁₆Pt₂₀Sn₆₄的高。

关键字: Au-Pt-Sn 体系；相图；等温截面；显微组织；相平衡；调幅分解

Isothermal section of Au-Pt-Sn ternary system at 700 ℃

HU Jie-qiong^{1, 2}, XIE Ming^{1, 2}, CHEN Song^{1, 2}, CHEN Yong-tai^{1, 2}, WANG Song², WANG Sai-bei^{1, 2}

（1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Kunming Institute of Precious Metals, Kunming 650106, China）

Abstract:The isothermal section of the Au-Pt-Sn ternary system at 700 ℃ was investigated by X-ray diffractometer and electron probe microanalyzer. The results show that the isothermal section of the Au-Pt-Sn ternary system at 700 ℃ is composed of three single-phase regions, seven two-phase regions and six three-phase regions. The six three-phase regions including Pt₃Sn+FCC-A1+PtSn, PtSn+FCC-A1+Au₅Sn, PtSn+Pt₃Sn+Au₅Sn, Pt₃Sn+FCC-A1+Au₅Sn, PtSn+Pt₂Sn₃+Liquid, PtSn+FCC-A1+Liquid. The spinodal decomposition reaction of Au-Pt alloy exists in the Au-Pt-Sn system. With decreasing Pt content, the spinodal decomposition phase in the alloy gradually disappears, and it completely disappears in Au₁₆Pt₃₀Sn₅₄and Au₁₆Pt₂₀Sn₆₄ samples. Because the melting point of Pt-Sn alloy phase is higher than that of Au-Sn alloy, most of phases in 700 ℃ isothermal section are Pt-Sn alloy, while Au-Sn alloy phase mainly exists in liquid phase. The microstructures distribution of Au₁₆Pt₆₉Sn₁₅, Au₁₆Pt₅₄Sn₃₀and Au₁₆Pt₄₂Sn₄₂ alloy are more uniform and the strengths of the alloy are higher than that of Au₁₆Pt₃₀Sn₅₄and Au₁₆Pt₂₀Sn₆₄ alloy because of the existence of spinodal decomposition phase.

Key words: Au-Pt-Sn system; phase diagram; isothermal section; microstructure; phase equilibrium; spinodal decomposition

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW