Co-Mn-Mo三元系fcc相扩散动力学优化
发布时间：2018-11-19 19:10
【摘要】：为了完善Co基高温合金动力学数据库,本文利用扩散偶法测定了Co-Mn、Co-Mo二元系及Co-Mn-Mo三元系fcc相中的互扩散系数,并利用DICTRA软件对该三元系进行了完整的动力学优化。本研究首先利用扩散偶法和EPMA技术,基于Sauer-Freise方法拟合得到了Co-Mn、Co-Mo体系fcc相中的互扩散系数。在此基础上,结合文献中现有的各类扩散系数数据(包括实验和半经验数据),优化得到了Co-Mn、Co-Mo合金fcc相中精准的原子移动性参数。利用所得参数计算得到的各扩散系数与实验数据基本一致,且模拟得到的成分曲线与实验测定值吻合较好,因此本文得到的二元系原子移动性参数较为可靠。此外,在总结前人工作的基础上,本研究依据经验方法近似给出了Mn-Mo二元系fcc相的原子移动性参数。为了得到较为准确的Co-Mn-Mo三元系热力学数据库,本文首先利用文献中的相图数据优化了Mn-Mo二元系的热力学参数,然后通过合金法测定了Co-Mn-Mo三元系1175℃时等温截面中(fcc+μ)两相区的相界,并优化了该三元系中liquid、fcc和μ相的热力学参数,填补了相关研究的空白,并为该三元系的动力学优化提供了热力学参考。在确定Co-Mn、Co-Mo、Mn-Mo二元系动力学参数的基础上,本研究利用扩散偶法,基于Whittle-Green方法,得到了Co-Mn-Mo三元系fcc相的互扩散数据,并通过优化确定了该三元系fcc相中的原子移动性参数。利用所得参数计算得到了该三元系fcc相中的扩散系数,在与实验数据对比后发现两者吻合较好,且得到的扩散成分曲线与实验实际情况基本一致。因此,本研究最终获得的Co-Mn-Mo三元系原子移动性参数具有较高的准确性,可为Co基动力学数据库的建立提供参考。
[Abstract]:In order to improve the dynamic database of Co based superalloys, the interdiffusion coefficients in fcc phase of Co-Mn,Co-Mo binary system and Co-Mn-Mo ternary system have been measured by diffusion couple method. The complete kinetic optimization of the ternary system is carried out by using DICTRA software. In this study, diffusion couple method and EPMA technique were used to fit the interdiffusion coefficient in fcc phase of Co-Mn,Co-Mo system based on Sauer-Freise method. On this basis, the accurate atomic mobility parameters in the fcc phase of Co-Mn,Co-Mo alloy are optimized by combining the existing data of diffusion coefficients (including experimental and semi-empirical data) in the literature. The calculated diffusion coefficients are in good agreement with the experimental data, and the simulated composition curves are in good agreement with the measured values, so the atomic mobility parameters obtained in this paper are more reliable. In addition, based on the previous work, the atomic mobility parameters of fcc phase in Mn-Mo binary system are obtained by empirical method. In order to obtain a more accurate thermodynamics database of Co-Mn-Mo ternary system, the thermodynamic parameters of Mn-Mo binary system are optimized by using the phase diagram data in the literature. Then the phase boundaries of the fcc 渭 region in the isothermal section of Co-Mn-Mo ternary system at 1175 鈩，
本文编号：2343177
[Abstract]:In order to improve the dynamic database of Co based superalloys, the interdiffusion coefficients in fcc phase of Co-Mn,Co-Mo binary system and Co-Mn-Mo ternary system have been measured by diffusion couple method. The complete kinetic optimization of the ternary system is carried out by using DICTRA software. In this study, diffusion couple method and EPMA technique were used to fit the interdiffusion coefficient in fcc phase of Co-Mn,Co-Mo system based on Sauer-Freise method. On this basis, the accurate atomic mobility parameters in the fcc phase of Co-Mn,Co-Mo alloy are optimized by combining the existing data of diffusion coefficients (including experimental and semi-empirical data) in the literature. The calculated diffusion coefficients are in good agreement with the experimental data, and the simulated composition curves are in good agreement with the measured values, so the atomic mobility parameters obtained in this paper are more reliable. In addition, based on the previous work, the atomic mobility parameters of fcc phase in Mn-Mo binary system are obtained by empirical method. In order to obtain a more accurate thermodynamics database of Co-Mn-Mo ternary system, the thermodynamic parameters of Mn-Mo binary system are optimized by using the phase diagram data in the literature. Then the phase boundaries of the fcc 渭 region in the isothermal section of Co-Mn-Mo ternary system at 1175 鈩，
本文编号：2343177
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