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

Shenglong Liang ¹Xiaochun Liu ²Suihe Jiang ³Huihui Zhu ⁴Wei Li ⁵Leqing Liu ⁴Xiongjun Liu ⁴Yuan Wu ⁴Xiaobin Zhang ⁴Hui Wang ⁴Zhaoping Lu⁴

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作者信息

1. 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
2. Institute of Metals,College of Materials Science and Engineering,Changsha University of Science & Technology,Changsha 410000,China
3. 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;Liaoning Academy of Materials,Shenyang 110000,China
4. 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
5. Inner Mongolia University of science and technology,Instrumental Analysis Center,Baotou 014000,China
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Abstract

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.

Key words

Copper alloys/Coherent precipitation/Ultrafine-grained materials/Recrystallization/Microstructural stability

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基金项目

国家自然科学基金(52101120)

国家自然科学基金(52322102)

国家自然科学基金(51971018)

国家重点研发计划(2022YFB3705201)

出版年

2024

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

参考文献量39

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