On the nucleation and interaction mechanisms of hexagonal close packed (HCP) martensite in a Fe50Mn30Co10Cr10 high entropy alloy
(2025) Acta Materialia — Vol. 296, p. 121293 (2025)
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- Authors
Liang, Yanxiang 
- Abstract
- The nucleation and interaction mechanisms of hexagonal close packed (ε-HCP) martensite in a Fe50Mn30Co10Cr10 high entropy alloy were investigated using atomic-resolution scanning transmission electron microscopy and molecular dynamic simulations. We demonstrate that the nucleation of ε-HCP is controlled by the activation of different mechanisms, including the six-plane and stair-rod cross-slip mechanisms. The nature of the intricate interaction mechanisms between two conjugated ε lamellae are highly dependent on the level of deformation and on the difference of thickness between the two crossing ε-HCP. Various absorption and transmission mechanisms of the incoming ε-HCP across the primary ε-HCP are revealed, involving local lattice rotation, the formation of new boundaries as well as stress induced twinning and phase transformation at the intersection sites. The synergy/competition between these mechanisms is discussed and compared with recent literature. These findings shed new light on the elementary mechanisms at the origin the remarkable strain hardening capacity of this category of high entropy alloys.
- Affiliations
Nanjing Tech University Key laboratory for Light-weight Materials Suzhou Laboratory Southwest Jiaotong University State Key Laboratory of Rail Transit Vehicle System Nanjing Institute of Technology School of Materials Science and Engineering Chongqing University of Technology College of Material Science and Engineering
Citations
Ding, L., Liang, Y., Weng, Y., Tu, J., Jia, Z., Liu, Q., Pardoen, T., & Idrissi, H. (2025). On the nucleation and interaction mechanisms of hexagonal close packed (HCP) martensite in a Fe50Mn30Co10Cr10 high entropy alloy. Acta Materialia, 296, 121293. https://doi.org/10.1016/j.actamat.2025.121293 (Original work published 2025)