ZrC纳米颗粒弥散强化含Mo、Nb FeCrAl合金的组织与力学性能

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-05-09 DOI:10.1016/j.jallcom.2025.180876

Yunxia Gao , Jiashuai Tang , Hui Wang , Rui Liu , Yiyong Zhang , Qianfeng Fang , Xianping Wang

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引用次数: 0

摘要

FeCrAl基合金被认为是轻水堆（LWRs）先进容错燃料（ATF）包壳材料中最有前途的候选材料之一。研究了Mo、Nb元素和ZrC纳米颗粒的加入对Fe-13Cr-5Al合金力学性能和热稳定性的影响，并通过TEM和EBSD等显微组织表征对其强化机理进行了评价。合金的强度得到了有效的提高，同时在室温至800℃的温度下具有可接受的延展性。特别是在800℃时，FeCrAl-Mo-Nb-ZrC合金的极限抗拉强度达到131 MPa，分别比Fe-13Cr-5Al合金提高了138%。同时，经1000℃退火20 h后，FeCrAl-Mo-Nb-ZrC合金仍保持较高的强度和良好的塑性，具有超高的热稳定性。纳米ZrC和氧化铝颗粒的弥散强化、Mo和Nb元素的固溶强化以及晶粒细化强化的协同作用，使材料的高温强度和热稳定性得到了显著提高。

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Microstructure and mechanical properties of ZrC nanoparticles dispersion-strengthened FeCrAl alloys containing Mo and Nb

FeCrAl based alloys are considered as one of the most promising candidates for the advanced accident tolerance fuel (ATF) cladding in light water reactors (LWRs). The effects of Mo and Nb elements and ZrC nanoscale particles addition on mechanical property and thermal stability of Fe-13Cr-5Al alloys were investigated, and the strengthening mechanism was assessed by microstructure characterizations including TEM and EBSD. The strength of alloys has been effectively improved along with an acceptable ductility at temperatures from RT to 800 °C. Especially at 800 °C, the ultimate tensile strength of FeCrAl-Mo-Nb-ZrC alloy has been improved to be 131 MPa, which is 138 % higher than that of raw Fe-13Cr-5Al alloys, respectively. At the same time, FeCrAl-Mo-Nb-ZrC alloy maintains high strength and favorable ductility after an annealing at 1000 °C for 20 h, indicating an ultra-high thermal stability. The enhanced high temperature strength and excellent thermal stability can be mainly attributed to the synergistic effects of the dispersion strengthening by nanoscale ZrC and alumina particles, solid solution strengthening by Mo and Nb elements and the grain refinement strengthening.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.