文献类型：期刊文献

英文题名：Mechanistic insights into heterogeneous interface-driven deformation patterns and strengthening mechanisms in harmonic-structured CoCrFeMnNi high-entropy alloys

作者：Zhang, Yong[1,2];Wang, Yong-Ji[1];Jia, Yun-Fei[1,2];Zhang, Zhe[3];Yuan, Ruo-Fei[1];Lu, Ti-Wen[1,2];Zhang, Xian-Cheng[1,2];Tu, Shan-Tung[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Safety, Shanghai 200237, Peoples R China;[3]Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300350, Peoples R China

年份：2026

卷号：118

外文期刊名：EUROPEAN JOURNAL OF MECHANICS A-SOLIDS

收录：;EI(收录号：20260620019686);WOS:【SCI-EXPANDED(收录号:WOS:001686205400001)】；

基金：This work was partially supported by the National Natural Science Foundation of China (52222505, 52575174 and 52075368) , Natural Science Foundation of Shanghai (23ZR1415500) , Shanghai Municipal Education Commission and the National Key Research and Development Program of China (2022YFC3004501) .

语种：英文

外文关键词：Harmonic structure; High entropy alloy; Micro slip bands; Hetero-deformation induced hardening; Crystal plasticity; Strain gradient

摘要：High-performance metallic structured materials are increasingly utilized in various industrial applications due to their exceptional mechanical properties. Understanding the mechanical response and strengthening mechanisms during loading is crucial for optimizing these materials. In this study, a series of harmonic-structured CoCr-FeMnNi high-entropy alloys (HEAs) with varying shell fractions were fabricated, exhibiting an exceptional combination of high strength and ductility. The evolution of deformation patterns and various strengthening mechanisms were investigated through in situ tensile tests and crystal plasticity finite element modeling (CPFEM). The results demonstrate that the synergistic interaction between the core and shell regions within harmonic structures significantly enhances both strength and ductility. Dislocation accumulation, primarily at the heterogeneous interface between the core and shell regions, along with dense and stable shear bands, contributes to additional strain hardening and improved ductility. The strengthening mechanisms of the harmonic structure topology and hetero-deformation-induced (HDI) hardening in coarse grains (CGs) were quantitatively evaluated. Furthermore, experimental data and parametric analyses reveal that the strain hardening rate increases almost linearly with the density of heterogeneous interfaces in the HS HEAs. These findings provide critical insights into the deformation and strengthening mechanisms of HS HEAs, establishing a robust framework for the future design of advanced heterostructured materials with optimized mechanical properties.