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

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

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
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.

Phase field modelMismatch strainSecond-phase precipitationGrain boundary segregationNanocrystalline alloys

Min Zhou、Hong-Hui Wu、Yuan Wu、Hui Wang、Xiong-Jun Liu、Sui-He Jiang、Xiao-Bin Zhang、Zhao-Ping Lu

展开 >

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

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFunds for Creative Research Groups of NSFCFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesUSTB Mat-Com of Beijing Advanced Innovation Center for Materials Genome Engineering

521224085190101351971018521011885222510352071023U20B202551921001University of ScienceTechnology BeijingFRF-TP-2021-04C106500135

2024

10.1007/s12598-024-02678-w

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(7)
  • 4