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; Zhang, Minghe; Yan, Zhiran; Cao, Yuxian; Nie, Zhihua; Ren, Yang; Wang, Yan-Dong

doi:10.1016/j.msea.2020.139936

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

Journal Article · Sun Jul 19 00:00:00 EDT 2020 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2020.139936· OSTI ID:1780985

Xu, Ning ^[1]; Li, Shilei ^[1]; Li, Runguang ^[1]; Zhang, Minghe ^[1]; Yan, Zhiran ^[1]; Cao, Yuxian ^[1]; Nie, Zhihua ^[2]; Ren, Yang ^[3]; Wang, Yan-Dong ^[1]

Univ. of Science and Technology of China, Beijing (China). Beijing Advanced Innovation Center for Materials Genome Engineering, State Key Lab. for Advanced Metals and Materials
Beijing Inst. of Technology (China)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

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. Furthermore, 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//[11 $\bar{2}$ 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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities

Grant/Contract Number:: AC02-06CH11357; 2017YFA0403804; 51527801; FRF-GF-19-025B

OSTI ID:: 1780985

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 795; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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

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