Phase field modeling of grain stability of nanocrystalline alloys by explicitly incorporating mismatch strain

Min Zhou ¹Hong-Hui Wu ²Yuan Wu ³Hui Wang ¹Xiong-Jun Liu ¹Sui-He Jiang ¹Xiao-Bin Zhang ¹Zhao-Ping Lu¹

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作者信息

1. Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China
2. Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;Institute for Carbon Neutrality,University of Science and Technology,Beijing 100083,China;Institute of Materials Intelligent Technology,Liaoning Academy of Materials,Shenyang 110004,China
3. Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;Institute of Materials Intelligent Technology,Liaoning Academy of Materials,Shenyang 110004,China
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Abstract

Nanocrystalline materials exhibit unique properties due to their extremely high grain boundary(GB)density.However,this high-density characteristic induces grain coars-ening at elevated temperatures,thereby limiting the widespread application of nanocrystalline materials.Recent experimental observations revealed that GB segregation and second-phase pinning effectively hinder GB migration,thereby improving the stability of nanocrystalline materials.In this study,a mod-ified phase-field model that integrates mismatch strain,solute segregation and precipitation was developed to evaluate the influence of lattice misfit on the thermal stability of nanocrys-talline alloys.The simulation results indicated that introducing a suitable mismatch strain can effectively enhance the microstructural stability of nanocrystalline alloys.By syner-gizing precipitation with an appropriate lattice misfit,the for-mation of second-phase particles in the bulk grains can be suppressed,thereby facilitating solute segregation/precipitation at the GBs.This concentrated solute segregation and precipi-tation at the GBs effectively hinders grain migration,thereby preventing grain coarsening.These findings provide a new perspective on the design and regulation of nanocrystalline alloys with enhanced thermal stability.

Key words

Phase field model/Mismatch strain/Second-phase precipitation/Grain boundary segregation/Nanocrystalline alloys

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基金项目

National Natural Science Foundation of China(52122408)

National Natural Science Foundation of China(51901013)

National Natural Science Foundation of China(51971018)

National Natural Science Foundation of China(52101188)

National Natural Science Foundation of China(52225103)

National Natural Science Foundation of China(52071023)

National Natural Science Foundation of China(U20B2025)

Funds for Creative Research Groups of NSFC(51921001)

Fundamental Research Funds for the Central Universities(University of Science)

Fundamental Research Funds for the Central Universities(Technology Beijing)

Fundamental Research Funds for the Central Universities(FRF-TP-2021-04C1)

Fundamental Research Funds for the Central Universities(06500135)

USTB Mat-Com of Beijing Advanced Innovation Center for Materials Genome Engineering()

出版年

2024

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDCSCDEI

影响因子：0.801

ISSN：1001-0521

参考文献量4

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