Study on the isothermal section at 1373K in the Fe–Mo–V system and atomic mobility of the V-rich bcc phase

IF 1.9 3区 材料科学 Q4 CHEMISTRY, PHYSICAL Calphad-computer Coupling of Phase Diagrams and Thermochemistry Pub Date : 2023-12-03 DOI:10.1016/j.calphad.2023.102646
Daomin Ye , Xiaoqun Li , Cuiping Guo , Changrong Li , Zhenmin Du
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Abstract

To determine the homogeneity range of the bcc phase in the Fe–Mo–V system, the isothermal section of the Fe–Mo–V system at 1373 K was constructed by analyzing phase constituents of annealing samples using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. Two groups of diffusion couples A and B with the terminal alloys located in the V-rich bcc phase region were prepared and annealed at 1473 K for 96 h and 1373 K for 288 h, respectively. Based on the obtained concentration profiles, the ternary diffusion behaviors of the V-rich bcc phase in the Fe–Mo–V alloys were investigated by the electron probe microanalysis (EPMA) technique combined with the Whittle and Green method. Depending on DICTRA software, the atomic mobility parameters for the bcc phase of the Fe–Mo–V system were optimized. The experimental concentration profiles and diffusion paths in the Fe–Mo–V alloys can be well reproduced using the atomic mobility and thermodynamic parameters.

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Fe-Mo-V体系1373K等温截面及富v bcc相原子迁移率研究
为了确定Fe-Mo-V体系中bcc相的均匀性范围,利用x射线衍射(XRD)和扫描电镜(SEM)技术分析了Fe-Mo-V体系在1373 K时的等温截面。制备了末端合金位于富v bcc相区的两组扩散偶A和B,分别在1473 K下退火96 h和1373 K退火288 h。在此基础上,采用电子探针显微分析(EPMA)技术,结合Whittle和Green方法,研究了富v的bcc相在Fe-Mo-V合金中的三元扩散行为。利用DICTRA软件对Fe-Mo-V体系bcc相的原子迁移率参数进行了优化。利用原子迁移率和热力学参数可以很好地再现Fe-Mo-V合金中的实验浓度分布和扩散路径。
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来源期刊
CiteScore
4.00
自引率
16.70%
发文量
94
审稿时长
2.5 months
期刊介绍: The design of industrial processes requires reliable thermodynamic data. CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) aims to promote computational thermodynamics through development of models to represent thermodynamic properties for various phases which permit prediction of properties of multicomponent systems from those of binary and ternary subsystems, critical assessment of data and their incorporation into self-consistent databases, development of software to optimize and derive thermodynamic parameters and the development and use of databanks for calculations to improve understanding of various industrial and technological processes. This work is disseminated through the CALPHAD journal and its annual conference.
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