摘要
本文从三元系 Spinodal 分解的热力学判据,G<sub>xx</sub>（δX）<sup>2</sup>+2G<sub>xy</sub>δXδy+G<sub>yy</sub>（δy）<sup>2</sup>【0出发,分析讨论了 Cu-Ni-Sn 三元系合金 Spinodal 分解的热力学问题,利用相应的二元相图及热力学数据,以规则溶液作近似,估算出组元间的交互作用系数,应用计算机计算了不同温度下 Spinodal 分解的成分范围,结果表明计算的化学 Spinodal线均在相应温度的溶解度曲线内侧,对 Cu-15Ni-8Sn 这一合金通过透射电镜观察和 x 光小角散射分析等手段进行了试验验证。
Thermodyamics of Spinodal Decomposition in Cu-Ni-Sn System has been analyzed using the Thermodynamics criterion of spinodal decomposition in ternary system:G_(xx)(δX)~2+2G_(xy)(δXδy)+G_(yy_(δy)~2<0 Applying the regular solution model,the interaction parameters of binary systems are estimated and used to calculated the chemical spinodal solvus and the directions of composition fluctuation.It has been found that the spinodal decomposition at 623K in Cu-Ni-Sn alloys belongs to that so called“decomposition restricted by the direction of composition fluctuation”.Both segregation of Ni and Sn play an important role during decomposition process.The experiments of TEM and SAXS prove that the spinodal decom-position does occur in Cu-15Ni-SSn alloy aged at 623K..
基金
国家自然科学基金资助课题
