Co-Mn-Mo三元系fcc相擴散動力學優(yōu)化
發(fā)布時間：2018-11-19 19:10
【摘要】：為了完善Co基高溫合金動力學數(shù)據(jù)庫,本文利用擴散偶法測定了Co-Mn、Co-Mo二元系及Co-Mn-Mo三元系fcc相中的互擴散系數(shù),并利用DICTRA軟件對該三元系進行了完整的動力學優(yōu)化。本研究首先利用擴散偶法和EPMA技術,基于Sauer-Freise方法擬合得到了Co-Mn、Co-Mo體系fcc相中的互擴散系數(shù)。在此基礎上,結合文獻中現(xiàn)有的各類擴散系數(shù)數(shù)據(jù)(包括實驗和半經(jīng)驗數(shù)據(jù)),優(yōu)化得到了Co-Mn、Co-Mo合金fcc相中精準的原子移動性參數(shù)。利用所得參數(shù)計算得到的各擴散系數(shù)與實驗數(shù)據(jù)基本一致,且模擬得到的成分曲線與實驗測定值吻合較好,因此本文得到的二元系原子移動性參數(shù)較為可靠。此外,在總結前人工作的基礎上,本研究依據(jù)經(jīng)驗方法近似給出了Mn-Mo二元系fcc相的原子移動性參數(shù)。為了得到較為準確的Co-Mn-Mo三元系熱力學數(shù)據(jù)庫,本文首先利用文獻中的相圖數(shù)據(jù)優(yōu)化了Mn-Mo二元系的熱力學參數(shù),然后通過合金法測定了Co-Mn-Mo三元系1175℃時等溫截面中(fcc+μ)兩相區(qū)的相界,并優(yōu)化了該三元系中l(wèi)iquid、fcc和μ相的熱力學參數(shù),填補了相關研究的空白,并為該三元系的動力學優(yōu)化提供了熱力學參考。在確定Co-Mn、Co-Mo、Mn-Mo二元系動力學參數(shù)的基礎上,本研究利用擴散偶法,基于Whittle-Green方法,得到了Co-Mn-Mo三元系fcc相的互擴散數(shù)據(jù),并通過優(yōu)化確定了該三元系fcc相中的原子移動性參數(shù)。利用所得參數(shù)計算得到了該三元系fcc相中的擴散系數(shù),在與實驗數(shù)據(jù)對比后發(fā)現(xiàn)兩者吻合較好,且得到的擴散成分曲線與實驗實際情況基本一致。因此,本研究最終獲得的Co-Mn-Mo三元系原子移動性參數(shù)具有較高的準確性,可為Co基動力學數(shù)據(jù)庫的建立提供參考。
[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，
本文編號：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，
本文編號：2343177
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