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制备了bcc结构Al-Fe-Mn和fcc结构Al-Cu-Ni三元铝合金单相固态半无限长和有限长(或薄膜型)扩散偶,通过EPMA测得相应成分-距离曲线,并采用实用型数值回归法计算了相应合金体系1273 K时随成分变化的互扩散系数,所得结果均满足热力学稳定条件.基于所测得互扩散系数及Fick第二定律,重现了实验测定的成分-距离曲线,证实了所获得互扩散系数的可靠性.进一步分析结果表明,该实用型数值回归法不仅可以高效准确地计算单相三元扩散偶随成分变化的互扩散系数,还能很好地解决传统方法不能处理的情况,如扩散通道上无交点的扩散偶和有限长(或薄膜型)扩散偶等.
The bcc structure Al-Fe-Mn and fcc structure Al-Cu-Ni ternary aluminum alloy single-phase solid semi-infinite and finite length (or thin film) diffusion couple measured by EPMA corresponding composition - distance curve, and using Practical numerical regression method was used to calculate the interdiffusion coefficient with composition of the corresponding alloy system at 1273 K. The results obtained satisfy the thermodynamic stability conditions. Based on the measured interdiffusion coefficient and Fick’s second law, the experimentally determined composition- Distance curve, the reliability of the interdiffusion coefficient obtained is confirmed.Further analysis results show that the practical numerical regression method not only can calculate the interdiffusion coefficient of the change of the incidental composition of the single-phase ternary dispersion efficiently and accurately, but also can well Solve the traditional method can not handle the situation, such as the diffusion channel without diffuse even and finite length (or thin film) diffusion even.