Effects of spark plasma sintering parameters on sintering mechanism of yttrium hydride

IF 14.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science & Technology Pub Date : 2025-02-19 DOI:10.1016/j.jmst.2025.01.013

Xuyang Shang, Yuxin Lin, Keke Hou, Yajuan Zhong, Changqing Cao, Yanhui Wang, Hongtao Zeng, Jun Lin

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Abstract

Yttrium hydride (YH_x) is a highly promising neutron moderator material for nuclear reactors, known for its exceptional thermal stability and high hydrogen content. This study investigated the sintering mechanism and microstructural evolution of YH_x monoliths processed by spark plasma sintering (SPS), with the effects of temperature, duration, and pressure. The results indicate that the sintering process can be divided into five stages: formation of sintering necks, rapid densification, anti-densification, recrystallization, and grain growth. The anti-densification behavior is attributed to hydrogen desorption, phase transformation-induced volumetric contraction, and vacancy coalescence from hydrogen migration, leaving residual pores and lattice defects. Furthermore, increasing the sintering temperature and duration promotes recrystallization and grain growth, whereas elevated pressure effectively suppresses grain boundary migration. This research establishes fundamental processing-structure correlations critical for optimizing YH_x moderators in nuclear applications.

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放电等离子烧结参数对氢化钇烧结机理的影响

氢化钇（YHx）是一种非常有前途的核反应堆中子慢化剂材料，以其优异的热稳定性和高氢含量而闻名。研究了放电等离子烧结（SPS）制备YHx单晶的烧结机理和微观组织演变，以及温度、持续时间和压力的影响。结果表明，烧结过程可分为烧结颈形成、快速致密化、反致密化、再结晶和晶粒长大5个阶段。反致密行为归因于氢的解吸、相变引起的体积收缩和氢迁移引起的空位聚并，留下残留的孔隙和晶格缺陷。此外，提高烧结温度和持续时间有利于再结晶和晶粒长大，而提高压力可有效抑制晶界迁移。本研究建立了对优化核应用中YHx调节剂至关重要的基本处理-结构相关性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Materials Science & Technology 工程技术-材料科学：综合

CiteScore

20.00

自引率

11.00%

发文量

995

审稿时长

13 days

期刊介绍： Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.