【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、Pt Sn+FCC-A1+Au₅Sn、Pt Sn+Pt₃Sn+Au₅Sn、Pt₃Sn+FCC-A1+Au₅Sn、Pt Sn+Pt₂Sn₃+Liquid和Pt Sn+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。更多还原

【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,Pt Sn+Pt₃Sn+Au₅Sn,Pt₃Sn+FCC-A1+Au₅Sn,Pt Sn+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 Au₁₆Pt₃₀Sn₅₄ and 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,Au₁₆Pt₅₄Sn₃₀ and 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.更多还原