Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K

Wanchuck Woo; Muhammad Naeem; Jae-Suk Jeong; Cheol-Min Lee; Stefanus Harjo; Takuro Kawasaki; Haiyan He; Xun-Li Wang

doi:10.1016/j.msea.2020.139224

Author(s)

Wanchuck Woo
Jae-Suk Jeong
Cheol-Min Lee
Stefanus Harjo
Takuro Kawasaki

Related Research Unit(s)

Detail(s)

Original language	English
Article number	139224
Journal / Publication	Materials Science and Engineering A
Volume	781
Online published	9 Mar 2020
Publication status	Published - 20 Apr 2020

Link(s)

DOI	DOI https://doi.org/10.1016/j.msea.2020.139224 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85081125432&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(757aab68-6337-4e12-b518-a27a57787cfd).html

Abstract

To elucidate deformation behavior behind the exceptional mechanical properties of CrCoNi based medium entropy alloys, the deformation related microstructural parameters were determined by using in situ neutron diffraction and peaks profile analysis methods. Superior tensile strength and elongation of the CrCoNi alloy is relevant to higher twin fault probability (P_tw, up to 3.8%) and dislocation density (ρ, up to 9.7 x 10¹⁵ m⁻²) compared to those (1.3% and 3.4 x 10¹⁵ m⁻², respectively) of the CrCoNiFe at 293K. Meanwhile, at 140K, the P_tw of the CrCoNiFe significantly increased up to 4.4% with the stable ρ of ~5.0 x 10¹⁵ m⁻² and its mechanical properties overwhelm those of the CrCoNi at 273K. Such twinning dominant deformation mechanism at low temperature is also assured by lower stacking fault energy (SFE) of the CrCoNiFe (7.4 mJ/m²) at 140K compared to those of the CrCoNi (16.1 mJ/m²) and CrCoNiFe (32.1 mJ/m²) alloys at 293K.

Research Area(s)

Deformation twin, Dislocation density, Medium entropy alloy, Neutron diffraction, Stacking fault energy

Citation Format(s)

[ RIS ] [ BibTeX ]

Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K. / Woo, Wanchuck; Naeem, Muhammad; Jeong, Jae-Suk et al.
In: Materials Science and Engineering A, Vol. 781, 139224, 20.04.2020.

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

Woo, W, Naeem, M, Jeong, J-S, Lee, C-M, Harjo, S, Kawasaki, T, He, H & Wang, X-L 2020, 'Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K', Materials Science and Engineering A, vol. 781, 139224. https://doi.org/10.1016/j.msea.2020.139224

Woo, W., Naeem, M., Jeong, J-S., Lee, C-M., Harjo, S., Kawasaki, T., He, H., & Wang, X-L. (2020). Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K. Materials Science and Engineering A, 781, Article 139224. Advance online publication. https://doi.org/10.1016/j.msea.2020.139224

Woo W, Naeem M, Jeong J-S, Lee C-M, Harjo S, Kawasaki T et al. Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K. Materials Science and Engineering A. 2020 Apr 20;781:139224. Epub 2020 Mar 9. doi: 10.1016/j.msea.2020.139224

Woo, Wanchuck ; Naeem, Muhammad ; Jeong, Jae-Suk et al. / Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K. In: Materials Science and Engineering A. 2020 ; Vol. 781.