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Enhanced mechanical properties of carbon-doped FeNiMnAlCr high entropy alloy via hot-rolling

Journal Article · · Materials Characterization
 [1];  [2];  [2];  [2]
  1. Dartmouth College, Hanover, NH (United States); Dartmouth College, Hanover, NH, USA
  2. Dartmouth College, Hanover, NH (United States)
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This work demonstrates an improvement in the mechanical performance of the high entropy alloy Fe40.4Ni11.3Mn34.8Al7.5Cr6 containing 1.1 at. % carbon (CHEA) by hot-rolling followed by annealing at 1323 K. The microstructure was examined using scanning electron microscopy, electron backscatter diffraction, X-ray diffraction, and transmission electron microscopy. Room-temperature tensile tests were used to assess the alloy's mechanical properties. The presence of dense dislocation walls indicate that the alloy has not fully recrystallized and, moreover, the deformation substructure and the large fraction of Σ3 twin boundaries contribute to the high room temperature yield strength (~523 MPa). Despite the presence of substantial dislocation density, the annealed, hot-rolled CHEA displays an improvement in elongation to fracture (~33%) compared to the negligible ductility (< 2%) observed for the alloy after it has been simply annealed. Finally, the present work shows that hot rolling can produce good strength and ductility in the alloy while establishing the processing conditions necessary for the large-scale manufacture and utilization of its remarkable properties.
Research Organization:
Dartmouth College, Hanover, NH (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0018962
OSTI ID:
1593727
Alternate ID(s):
OSTI ID: 1573302
Journal Information:
Materials Characterization, Journal Name: Materials Characterization Journal Issue: C Vol. 158; ISSN 1044-5803
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (11)

Effect of hot work on the properties of Waspaloy journal September 1970
Energy of slip transmission and nucleation at grain boundaries journal January 2011
The effect of interstitial carbon on the mechanical properties and dislocation substructure evolution in Fe40.4Ni11.3Mn34.8Al7.5Cr6 high entropy alloys journal November 2016
The effect of carbon on the microstructures, mechanical properties, and deformation mechanisms of thermo-mechanically treated Fe40.4Ni11.3Mn34.8Al7.5Cr6 high entropy alloys journal March 2017
Dislocation slip transmission through a coherent Σ3{111} copper twin boundary: Strain rate sensitivity, activation volume and strength distribution function journal December 2018
Interstitial strengthening of a f.c.c. FeNiMnAlCr high entropy alloy journal October 2016
Effects of recrystallization annealing temperature on carbide precipitation, microstructure, and mechanical properties in Fe–18Mn–0.6C–1.5Al TWIP steel journal January 2010
The effects of carbon on the phase stability and mechanical properties of heat-treated FeNiMnCrAl high entropy alloys journal March 2019
Recrystallization and grain growth in hot rolling journal March 1979
Influence of Carbon Additions on the Dynamic Recrystallization of High Purity α-Iron journal January 2002
Role of annealing twins for grain refinement in controlled rolling of low carbon microalloyed steel. journal January 1983

Figures / Tables (8)

Figure 1(p. 17)figure Figure 1
Figure 2(p. 18)figure Figure 2
Figure 3(p. 19)figure Figure 3
Figure 4(p. 20)figure Figure 4
Figure 5(p. 21)figure Figure 5
Figure 6(p. 22)figure Figure 6
Figure 7(p. 23)figure Figure 7
Table 1(p. 24)table Table 1

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Related Subjects

36 MATERIALS SCIENCE
dislocations
high entropy alloys
hot-rolling