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Nano-twin Mediated Plasticity in Carbon-containing FeNiCoCrMn High Entropy Alloys

Journal Article · · Journal of Alloys and Compounds
 [1];  [2];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Equiatomic FeNiCoCrMn alloy has been reported to exhibit promising strength and ductility at cryogenic temperature and deformation mediated by nano-twining appeared to be one of the main reasons. We use the FeNiCoCrMn alloy as a base alloy to seek further improvement of its mechanical properties by alloying additional elements, i.e., interstitial carbon. Moreover, the effects of carbon on microstructures, mechanical properties and twinning activities were investigated in two different temperatures (77 and 293 K). With addition of 0.5 at% C, the high entropy alloy still remains entirely single phase face-centered cubic (FCC) crystal structure. We found that these materials can be cold rolled and recrystallized to produce a microstructure with equiaxed grains. Both strain hardening rate and strength are enhanced while high uniform elongations to fracture (~70% at 77 K and ~40% at 293 K) are still maintained. The increased strain hardening and strength could be caused by the promptness of deformation twinning in C-containing high entropy alloys.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1201287
Alternate ID(s):
OSTI ID: 22454107
OSTI ID: 1252086
Journal Information:
Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 647; ISSN 0925-8388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (15)

Effects of strain rate on room- and cryogenic-temperature compressive properties in metastable V10Cr10Fe45Co35 high-entropy alloy journal April 2019
Microstructure and Mechanical Properties Evolution of the Al, C-Containing CoCrFeNiMn-Type High-Entropy Alloy during Cold Rolling journal December 2017
Excellent room temperature ductility of as-cast TRIP high-entropy alloy via Mo and C alloying journal September 2019
Microstructure and Mechanical Properties of Al–Co–Cr–Fe–Ni Base High Entropy Alloys Obtained Using Powder Metallurgy journal January 2019
Hot Deformation Behavior and Hardness of a CoCrFeMnNi High-Entropy Alloy with High Content of Carbon journal May 2019
Multistage serrated flow behavior of a medium-manganese high-carbon steel journal December 2019
Microstructure and Mechanical Properties of High-Entropy Alloy Co20Cr26Fe20Mn20Ni14 Processed by High-Pressure Torsion at 77 K and 300 K journal July 2018
Interstitial atoms enable joint twinning and transformation induced plasticity in strong and ductile high-entropy alloys journal January 2017
Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy journal February 2018
Strong grain-size effect on deformation twinning of an Al 0.1 CoCrFeNi high-entropy alloy journal November 2016
Formation of chromium-iron carbide by carbon diffusion in Al X CoCrFeNiCu high-entropy alloys journal March 2018
Microstructure and mechanical properties of AlCoCrFeNi high entropy alloys produced by spark plasma sintering journal June 2019
Impact of interstitial C on phase stability and stacking-fault energy of the CrMnFeCoNi high-entropy alloy journal November 2019
Preparation of FeCoNiCrMn High Entropy Alloy by Electrochemical Reduction of Solid Oxides in Molten Salt and Its Corrosion Behavior in Aqueous Solution journal January 2017
A Review of Multi-Scale Computational Modeling Tools for Predicting Structures and Properties of Multi-Principal Element Alloys journal February 2019

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