Heavily twinned CoCrNi medium-entropy alloy with superior strength and crack resistance

Xiaobin Feng, Haokun Yang, Rong Fan, Wenqiang Zhang, Fanling Meng, Bin Gan*, Yang Lu*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

35 Citations (Scopus)

Abstract

The recrystallized and pre-deformed CoCrNi medium-entropy alloy (MEA), introduced with high-density deformation twins, exhibits an unprecedented high yield strength up to 2.1 GPa. We found that the highly distorted deformation twins provide strong resistance to crack propagation and the activated dislocation motion accommodates the further plastic deformation. Our in situ tensile tests of pre-notched sample reveal that crack propagation through strain localization band eventually leads to fracture. This result offers new insights on design and processing of MEA for desired mechanical performance.
Original languageEnglish
Article number139591
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume788
Online published22 May 2020
DOIs
Publication statusPublished - 24 Jun 2020

Research Keywords

  • Medium-entropy alloy
  • In-situ tensile test
  • Deformation twin
  • Strength
  • Crack resistance

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