Atomic-scale insights into the strength and plasticity enhancement of Ni-based superalloys with refinement dispersion of precipitates

被引：0
|
作者：
Yin, Yihui [1 ]
Lu, Shiqing [1 ]
Wang, Lusheng [1 ]
Song, Kun [1 ]
Huang, Xia [1 ]
Ding, Jun [1 ]
Yan, Siliang [2 ]
机构：
[1] Chongqing Univ Technol, Sch Mech Engn, Banan 400054, Peoples R China
[2] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China
来源：
CHEMICAL PHYSICS LETTERS | 2025年 / 861卷
基金：
中国国家自然科学基金;
关键词：
Molecular dynamics; Ni-based superalloys; Refinement dispersion; Strength and plasticity; MECHANICAL-PROPERTIES; HEAT-TREATMENT; MICROSTRUCTURE; STABILITY;
D O I：
10.1016/j.cplett.2024.141837
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of dispersion distribution of the precipitated phase (gamma' phase) on strength and plasticity at atomic scale in Ni-based superalloys with 15 % volume fraction of gamma' phase and diameters of 10 and 30 nm at roomtemperature were revealed by molecular dynamics simulation. The gamma' phase dispersion refinement can effectively suppress crack propagation, and enhances its strength and plasticity. The increased number of phase boundaries for dislocation nucleation has improved its strength. The small-sized gamma' phase boundaries promote dislocation nucleation and emission to reduce the stress concentration. Additionally, the competitive mechanism ISF and phase transition can further enhance the plasticity.
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页数：6
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