Scholarlink

<p>The ductile-to-brittle transition (DBT) of Ti-Nb-V multi-principal component alloys (MPEAs) was studied by combining experimental and molecular dynamics (MD) methods. The correctness of the selected potential function was verified through quenching simulation. Combined with transmission electron microscope, the stacking fault energy (SFE) values of Ti-Nb-V samples at different temperatures were measured and calculated. The microstructure in the process of crack initiation and propagation in the alloy system was discussed. The dependences of the length and density of different types of dislocations on temperature were calculated, and the effect of dislocations on the behavior of DBT was analyzed. The effects of critical energy release rate and fracture stress on DBT were studied. The critical transition point of DBT was determined. The accuracy of the DBT temperature (DBTT) obtained by MD method is evaluated by comparing the simulation results with the experimental results. The research in this paper deepens the understanding of DBT phenomenon of MPEAs, expands the nanoscale analysis method of dynamic cracking of alloy, and provides favorable theoretical support for optimizing material design.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Ductile-to-brittle transition of multi-principal component alloys under dynamic conditions: Molecular dynamics simulation and experiment

  • 期刊论文

  • 发表日期：

    2026年1月25日

查看全文
  • Cong Qi

摘要

The ductile-to-brittle transition (DBT) of Ti-Nb-V multi-principal component alloys (MPEAs) was studied by combining experimental and molecular dynamics (MD) methods. The correctness of the selected potential function was verified through quenching simulation. Combined with transmission electron microscope, the stacking fault energy (SFE) values of Ti-Nb-V samples at different temperatures were measured and calculated. The microstructure in the process of crack initiation and propagation in the alloy system was discussed. The dependences of the length and density of different types of dislocations on temperature were calculated, and the effect of dislocations on the behavior of DBT was analyzed. The effects of critical energy release rate and fracture stress on DBT were studied. The critical transition point of DBT was determined. The accuracy of the DBT temperature (DBTT) obtained by MD method is evaluated by comparing the simulation results with the experimental results. The research in this paper deepens the understanding of DBT phenomenon of MPEAs, expands the nanoscale analysis method of dynamic cracking of alloy, and provides favorable theoretical support for optimizing material design.