Real-time observations of TRIP-induced ultrahigh strain hardening in a dual-phase CrMnFeCoNi high-entropy alloy

• Published in: Nature communications 2020-02, Vol.11 (1), p.826-826, Article 826
• Main Authors: Chen, Sijing, Oh, Hyun Seok, Gludovatz, Bernd, Kim, Sang Jun, Park, Eun Soo, Zhang, Ze, Ritchie, Robert O., Yu, Qian
• Format: Article
• Language: English
• Subjects: 147/135; 147/137; 147/143; 147/28; 639/301/1023/1026; 639/301/1023/303; Alloys; Chemical composition; Cottrell locking; Crystal structure; Deformation mechanisms; Dimensional stability; Entropy; High entropy alloys; Humanities and Social Sciences; Image enhancement; MATERIALS SCIENCE; mechanical properties; metals and alloys; Metastable phases; multidisciplinary; Networks; Nucleation; Organic chemistry; Phase transitions; Plastic deformation; Science; Science (multidisciplinary); Stacking faults; Strain hardening
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-020-14641-1

Strategies involving metastable phases have been the basis of the design of numerous alloys, yet research on metastable high-entropy alloys is still in its infancy. In dual-phase high-entropy alloys, the combination of local chemical environments and loading-induced crystal structure changes suggests a relationship between deformation mechanisms and chemical atomic distribution, which we examine in here in a Cantor-like Cr 20 Mn 6 Fe 34 Co 34 Ni 6 alloy, comprising both face-centered cubic ( fcc ) and hexagonal closed packed ( hcp ) phases. We observe that partial dislocation activities result in stable three-dimensional stacking-fault networks. Additionally, the fraction of the stronger hcp phase progressively increases during plastic deformation by forming at the stacking-fault network boundaries in the fcc phase, serving as the major source of strain hardening. In this context, variations in local chemical composition promote a high density of Lomer-Cottrell locks, which facilitate the construction of the stacking-fault networks to provide nucleation sites for the hcp phase transformation. In dual-phase Cantor-like high entropy alloys, how local chemistry affects enhanced deformation mechanisms remains unclear. Here, the authors image 3D stacking fault networks formation and show they both impede dislocations and facilitate phase transformations via local chemical composition variations.