首页|Bulk ultrafine grained microstructures with high thermal stability via intragranular precipitation of coherent particles

Bulk ultrafine grained microstructures with high thermal stability via intragranular precipitation of coherent particles

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Producing ultrafine-grained(UFG)microstructures with enhanced thermal stability is an important yet challenging route to further improve mechanical properties of structural materials.Here,a high-performance bulk UFG copper that can stabilize even at temperatures up to 750 ℃(～0.75Tm,Tm is the melting point)was fabricated by manipulating its recrystallization behavior via low alloying of Co.Addition of 1 wt.％-1.5 wt.％of Co can trigger quick and copious intragranular clustering of Co atoms,which offers high Zener pinning pressure and pins the grain boundaries(GBs)of freshly recrystallized ul-trafine grains.Due to the fact that the subsequent growth of the coherent Co-enriched nanoclusters was slow,sufficient particles adjacent to GBs remained to inhibit the migration of GBs,giving rise to the UFG microstructure with prominently high thermal stability.This work manifests that the strategy for pro-ducing UFGs with coherent precipitates can be applied in many alloy systems such as Fe-and Cu-based,which paves the pathway for designing advanced strain-hardenable UFGs with plain compositions.

Copper alloysCoherent precipitationUltrafine-grained materialsRecrystallizationMicrostructural stability

Shenglong Liang、Xiaochun Liu、Suihe Jiang、Huihui Zhu、Wei Li、Leqing Liu、Xiongjun Liu、Yuan Wu、Xiaobin Zhang、Hui Wang、Zhaoping Lu

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Beijing Advanced Innovation Centre for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

Yangjiang Branch,Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory),Yangjiang 529500,China

Institute of Metals,College of Materials Science and Engineering,Changsha University of Science & Technology,Changsha 410000,China

Liaoning Academy of Materials,Shenyang 110000,China

Inner Mongolia University of science and technology,Instrumental Analysis Center,Baotou 014000,China

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国家自然科学基金国家自然科学基金国家自然科学基金国家重点研发计划

5210112052322102519710182022YFB3705201

2024

10.1016/j.jmst.2023.08.069

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.181(14)
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