Phase-field simulation of core-rim structure at the early sintering stage in TiC-WC-Ni cermet

IF 1.9 3区 材料科学 Q4 CHEMISTRY, PHYSICAL
Yiqi Guan , Qi Huang , Yingbiao Peng , Xi Liu , Yi Kong , Hong Mao , Yong Du
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Abstract

Understanding the formation mechanism of core-rim structure in TiC-based cermets is essential for optimizing their mechanical properties, such as strength and toughness. In this work, the formation process of core-rim structure in TiC-WC-Ni cermet at the early sintering stage was investigated by means of the multiphase and phase-concentration modeling framework coupled with CALPHAD (CALculation of PHAse Diagrams) databases. The effect of W content in the Ni binder phase on the rim thickness was examined. The results reveal that W in the Ni binder phase diffuses into the undissolved TiC particles at the early sintering stage, leading to the formation of (Ti,W)C solid solution phase on the particle surface. This solid solution phase serves as the rim which constitutes the core-rim structure together with TiC particles. Furthermore, there is a positive correlation between the rim thickness and the W content in the Ni binder phase. Phase-field simulation exhibits a good agreement with the scanning electron microscopy (SEM) observations of the annealed WC-Ni/TiC–Ni cermet diffusion couple. This study offers a novel approach for exploring the formation mechanism of core-rim structure in TiC-based cermets.

TiC-WC-Ni 金属陶瓷早期烧结阶段的核心-边缘结构相场模拟
了解 TiC 基金属陶瓷中核缘结构的形成机理对于优化其强度和韧性等机械性能至关重要。在这项工作中,通过多相和相浓缩建模框架以及 CALPHAD(CALculation of PHAse Diagrams)数据库,研究了 TiC-WC-Ni 金属陶瓷在烧结早期的芯缘结构形成过程。研究了镍粘合剂相中 W 含量对边缘厚度的影响。结果表明,在烧结初期,镍粘结相中的 W 扩散到未溶解的 TiC 颗粒中,导致在颗粒表面形成 (Ti,W)C 固溶相。该固溶相作为边缘,与 TiC 颗粒一起构成了核-边缘结构。此外,边缘厚度与镍粘合剂相中的 W 含量之间存在正相关。相场模拟与退火后的 WC-Ni/TiC-Ni 金属陶瓷扩散耦合物的扫描电子显微镜(SEM)观察结果非常吻合。这项研究为探索 TiC 基金属陶瓷中核缘结构的形成机制提供了一种新方法。
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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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