Effects of second phase particles and pores on grain boundary migration during solid-state sintering: A phase-field study

IF 2.1 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Engineering and Design Pub Date : 2025-02-01 Epub Date: 2024-12-23 DOI:10.1016/j.nucengdes.2024.113800

Xiaoyong Qi , Yanbo Jiang , Wenlong Shen , Jinli Cao , Yuxuan Liao , Wenbo Liu

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Abstract

In the present work, a new phase-field model was developed to simulate the effects of second phase particles and pores on grain boundary (GB) removement during solid-state sintering of ceramic nuclear fuel. The simulation results show that the second phase particles near the GB make the interface energy distribution steeper, and the GB-particle equilibrium dihedral angle is related to the GB-particle interface energy and the GB-pore interface energy. During sintering, the contact between particles and GB in the early stage promotes the shrinkage of GB. However, during the later stage, the shrinkage of GB is suppressed due to the interaction of second phase particles and crystal grains. When the particles and pores act on the GB at the same time, the GB usually move together with the pores, while the GB prefer to leave the particles ultimately. The sintering simulation of polycrystalline containing both second-phase particles and pores showed that, when the particle area fraction increases, the growth rate of crystal grains slows down and the final grain size decreases. Consequently, second phase particles with different volume fractions can be doped to control the final average grain size during sintering.

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固相烧结过程中第二相颗粒和气孔对晶界迁移的影响：相场研究

本文建立了一种新的相场模型来模拟陶瓷核燃料固态烧结过程中第二相颗粒和孔隙对晶界（GB）去除的影响。模拟结果表明，第二相粒子在晶界附近使晶界能分布更陡，晶界平衡二面角与晶界能和晶界能有关。在烧结过程中，早期颗粒与GB的接触促进了GB的收缩。然而，在后期，由于第二相颗粒和晶粒的相互作用，GB的收缩受到抑制。当颗粒和孔隙同时作用于GB时，GB通常随孔隙一起移动，而GB最终倾向于离开颗粒。同时含有第二相颗粒和孔隙的多晶烧结模拟表明，随着颗粒面积分数的增加，晶粒的生长速度减慢，最终晶粒尺寸减小。因此，可以通过掺杂不同体积分数的第二相颗粒来控制烧结过程中的最终平均晶粒尺寸。

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.