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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

1 Scopus Citations
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Author(s)

  • Haokun Yang
  • Rong Fan
  • Fanling Meng
  • Bin Gan

Detail(s)

Original languageEnglish
Article number139591
Journal / PublicationMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume788
Online published22 May 2020
Publication statusPublished - 24 Jun 2020

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.

Research Area(s)

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

Citation Format(s)

Heavily twinned CoCrNi medium-entropy alloy with superior strength and crack resistance. / Feng, Xiaobin; Yang, Haokun; Fan, Rong; Zhang, Wenqiang; Meng, Fanling; Gan, Bin; Lu, Yang.

In: Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, Vol. 788, 139591, 24.06.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal