The effects of carbon on the phase stability and mechanical properties of heat-treated FeNiMnCrAl high entropy alloys

Wu, Margaret; Li, Zhiming; Gault, Baptiste; Munroe, Paul; Baker, Ian

doi:10.1016/j.msea.2019.01.083

Title: The effects of carbon on the phase stability and mechanical properties of heat-treated FeNiMnCrAl high entropy alloys

Journal Article · Sat Jan 26 00:00:00 EST 2019 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2019.01.083· OSTI ID:1593731

Wu, Margaret ^[1];

^[2]; Gault, Baptiste ^[2]; Munroe, Paul ^[3]; Baker, Ian ^[1]

Dartmouth College, Hanover, NH (United States)
Max-Planck-Inst. für Eisenforschung, Düsseldorf (Germany)
University of New South Wales, NSW (Australia)

This work systematically investigates the effect of carbon on the phase stability and room- temperature tensile performance of an annealed Fe_40.4Ni_11.3Mn_34.8Al_7.5Cr₆ (at%) high entropy alloy without (HEA) and with 1.1% carbon (CHEA). Four annealing conditions were investigated: 773 K for 13 d and 42 d, 973 K for 20 d, and 1073 K and 1423 K for 24 h. The resulting microstructures were analyzed using a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and atom probe tomography (APT). Vickers hardness testing and room- temperature tensile testing were used to determine the mechanical properties of the annealed HEA and the CHEA. APT composition profiles revealed fine Ni,Mn,Al-enriched matrix precipitates in the CHEA annealed at 773 K for 13 d. After ageing at 773 K for 42 d, colonies of (Ni,Fe)₂MnAl- enriched Heusler phase lamellae were observed at the grain boundaries (GBs) and in the matrix for the HEA, while GB lamellar colonies of Mn,Cr-enriched M₂₃C₆ carbides were observed for the CHEA. Due to the presence of the GB carbides, the resulting room-temperature elongation to fracture for the CHEA annealed at 773 K for 42 d was ~1% compared to ~11% for the HEA given the same anneal. At higher annealing temperatures, the microstructure contains Ni,Al-rich and Mn,Cr,C-rich precipitates that alternate along the GBs and appear to be associated with each other in the matrix. Electron diffraction analysis indicates the aforementioned Ni,Al-precipitates and Mn,Cr-carbides have b.c.c. and f.c.c. crystal structures, respectively. Once again, a low elongation to fracture (2%) was seen for the carbon-containing material compared to its un-doped counterpart (23%) which solely contained Ni,Al-rich b.c.c. precipitates.

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Research Organization:: Dartmouth College, Hanover, NH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Dartmouth College

Grant/Contract Number:: SC0018962; AC02-05CH11231; AC02–05CH11231

OSTI ID:: 1593731

Alternate ID(s):: OSTI ID: 1547828

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 748, Issue C; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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