In situ investigation of the deformation behaviors of Fe20Co30Cr25Ni25 and Fe20Co30Cr30Ni20 high entropy alloys by high-energy X-ray diffraction

Ning Xu; Shilei Li; Runguang Li; Minghe Zhang; Zhiran Yan; Yuxian Cao; Zhihua Nie; Yang Ren; Yan-Dong Wang

doi:10.1016/j.msea.2020.139936

Author(s)

Ning Xu
Shilei Li
Runguang Li
Minghe Zhang
Zhiran Yan
Yuxian Cao
Zhihua Nie
Yan-Dong Wang

Detail(s)

Original language	English
Article number	139936
Journal / Publication	Materials Science and Engineering A
Volume	795
Online published	19 Jul 2020
Publication status	Published - 23 Sept 2020
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1016/j.msea.2020.139936 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85088913115&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(6af96480-de66-4ae9-9eda-41037173b936).html

Abstract

In situ synchrotron-based high-energy X-ray diffraction (HE-XRD) technique was employed to investigate the mechanical behaviors and microstructural evolution of face-centered cubic (FCC) Fe₂₀Co₃₀Cr₂₅Ni₂₅ and Fe₂₀Co₃₀Cr₃₀Ni₂₀ high entropy alloys (HEAs) during tensile deformation. Fe₂₀Co₃₀Cr₃₀Ni₂₀ HEA has a good combination of strength (ultimate tensile strength of 864 ± 35 MPa) and ductility (elongation of 0.627 ± 0.021). The HE-XRD investigation reveals that Fe₂₀Co₃₀Cr₃₀Ni₂₀ HEA has the transformation-induced plasticity (TRIP) effect, which starts at a critical stress of ~555 MPa. Transmission electron microscopy confirmed this deformation-induced new phase is hexagonal-close-packed structured ε-martensite, which follows an orientation relationship of {111}_γ//(0001)_ε, and ⟨110⟩_γ//[112¯0]_ε with the FCC γ matrix. The observation of deformation twins in the deformed samples of the two studied HEAs proves that twinning-induced plasticity (TWIP) effect occurs in both HEAs. The combination of TRIP and TWIP effects lead to the high strength, large ductility and improved strain hardening behavior of Fe₂₀Co₃₀Cr₃₀Ni₂₀ HEA.

Research Area(s)

High entropy alloys, High-energy X-ray diffraction, Transformation-induced plasticity, Twinning-induced plasticity

Citation Format(s)

[ RIS ] [ BibTeX ]

In situ investigation of the deformation behaviors of Fe₂₀Co₃₀Cr₂₅Ni₂₅ and Fe₂₀Co₃₀Cr₃₀Ni₂₀ high entropy alloys by high-energy X-ray diffraction. / Xu, Ning; Li, Shilei; Li, Runguang et al.
In: Materials Science and Engineering A, Vol. 795, 139936, 23.09.2020.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Xu, N, Li, S, Li, R, Zhang, M, Yan, Z, Cao, Y, Nie, Z, Ren, Y & Wang, Y-D 2020, 'In situ investigation of the deformation behaviors of Fe₂₀Co₃₀Cr₂₅Ni₂₅ and Fe₂₀Co₃₀Cr₃₀Ni₂₀ high entropy alloys by high-energy X-ray diffraction', Materials Science and Engineering A, vol. 795, 139936. https://doi.org/10.1016/j.msea.2020.139936

Xu, N., Li, S., Li, R., Zhang, M., Yan, Z., Cao, Y., Nie, Z., Ren, Y., & Wang, Y.-D. (2020). In situ investigation of the deformation behaviors of Fe₂₀Co₃₀Cr₂₅Ni₂₅ and Fe₂₀Co₃₀Cr₃₀Ni₂₀ high entropy alloys by high-energy X-ray diffraction. Materials Science and Engineering A, 795, Article 139936. https://doi.org/10.1016/j.msea.2020.139936

Xu N, Li S, Li R, Zhang M, Yan Z, Cao Y et al. In situ investigation of the deformation behaviors of Fe₂₀Co₃₀Cr₂₅Ni₂₅ and Fe₂₀Co₃₀Cr₃₀Ni₂₀ high entropy alloys by high-energy X-ray diffraction. Materials Science and Engineering A. 2020 Sept 23;795:139936. Epub 2020 Jul 19. doi: 10.1016/j.msea.2020.139936

Xu, Ning ; Li, Shilei ; Li, Runguang et al. / In situ investigation of the deformation behaviors of Fe₂₀Co₃₀Cr₂₅Ni₂₅ and Fe₂₀Co₃₀Cr₃₀Ni₂₀ high entropy alloys by high-energy X-ray diffraction. In: Materials Science and Engineering A. 2020 ; Vol. 795.