Heterogeneous lattice strain strengthening in severely distorted crystalline solids

• DOI: 10.1073/pnas.2200607119
• Publication Date: 2022-06-13T19:14:11Z
• Authors: Jia Li; Yang Chen; Quanfeng He; Xiandong Xu; Hang Wang; Chao Jiang; Bin Liu; Qihong Fang; Yong Liu; Yong Yang; Peter K. Liaw; Chain T. Liu
• Keywords: Lattice (music); Strain (injury)

Multi-principal element alloys (MPEAs) exhibit outstanding mechanical properties because the core effect of severe atomic lattice distortion is distinctly different from that traditional alloys. However, at mesoscopic scale underlying physics for abundant dislocation activities responsible strength-ductility synergy has not been uncovered. While Eshelby mean-field approaches become insufficient to tackle yielding and plasticity in severely distorted crystalline solids, here we develop a three-dimensional discrete dynamics simulation approach by taking into account experimentally measured strain field model FeCoCrNiMn MPEA explore heterogeneous strain-induced strengthening mechanisms. Our results reveal causes unusual behaviors (i.e., multiple kinks/jogs bidirectional cross slips), resulting mechanisms underpin synergy. The outcome our research sheds important insights design strong yet ductile such as high-entropy ceramics.