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

Abstract:

: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 Cr20Mn6Fe34Co34Ni6 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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Chen S,Oh HS,Gludovatz B,Kim SJ,Park ES,Zhang Z,Ritchie RO,Yu Q

doi

10.1038/s41467-020-14641-1

subject

Has Abstract

pub_date

2020-02-11 00:00:00

pages

826

issue

1

issn

2041-1723

pii

10.1038/s41467-020-14641-1

journal_volume

11

pub_type

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