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

doi:10.1016/j.msea.2020.139591

Author(s)

Haokun Yang
Fanling Meng
Bin Gan
Yang Lu

Related Research Unit(s)

Detail(s)

Original language	English
Article number	139591
Journal / Publication	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume	788
Online published	22 May 2020
Publication status	Published - 24 Jun 2020

Link(s)

DOI	DOI https://doi.org/10.1016/j.msea.2020.139591 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85085275069&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(1baad79e-7038-426f-a61b-aba42e5e47d4).html

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)

[ RIS ] [ BibTeX ]

Heavily twinned CoCrNi medium-entropy alloy with superior strength and crack resistance. / Feng, Xiaobin; Yang, Haokun; Fan, Rong et al.
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 › peer-review

Feng, X, Yang, H, Fan, R , Zhang, W, Meng, F, Gan, B & Lu, Y 2020, 'Heavily twinned CoCrNi medium-entropy alloy with superior strength and crack resistance', Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, vol. 788, 139591. https://doi.org/10.1016/j.msea.2020.139591

Feng, X., Yang, H., Fan, R., Zhang, W., Meng, F., Gan, B., & Lu, Y. (2020). Heavily twinned CoCrNi medium-entropy alloy with superior strength and crack resistance. Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 788, Article 139591. Advance online publication. https://doi.org/10.1016/j.msea.2020.139591

Feng X, Yang H, Fan R , Zhang W, Meng F, Gan B et al. Heavily twinned CoCrNi medium-entropy alloy with superior strength and crack resistance. Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing. 2020 Jun 24;788:139591. Epub 2020 May 22. doi: 10.1016/j.msea.2020.139591

Feng, Xiaobin ; Yang, Haokun ; Fan, Rong et al. / Heavily twinned CoCrNi medium-entropy alloy with superior strength and crack resistance. In: Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing. 2020 ; Vol. 788.