Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Tunable stacking fault energies by tailoring local chemical order in CrCoNi medium-entropy alloys

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [1];  [2];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

High-entropy alloys (HEAs) are an intriguing new class of metallic materials due to their unique mechanical behavior. Achieving a detailed understanding of structure–property relationships in these materials has been challenged by the compositional disorder that underlies their unique mechanical behavior. Accordingly, in this work, we employ first-principles calculations to investigate the nature of local chemical order and establish its relationship to the intrinsic and extrinsic stacking fault energy (SFE) in CrCoNi medium-entropy solid-solution alloys, whose combination of strength, ductility, and toughness properties approaches the best on record. We find that the average intrinsic and extrinsic SFE are both highly tunable, with values ranging from –43 to 30 mJ•m–2and from –28 to 66 mJ•m–2, respectively, as the degree of local chemical order increases. The state of local ordering also strongly correlates with the energy difference between the face-centered cubic (fcc) and hexagonal close-packed (hcp) phases, which affects the occurrence of transformation-induced plasticity. Here, this theoretical study demonstrates that chemical short-range order is thermodynamically favored in HEAs and can be tuned to affect the mechanical behavior of these alloys. It thus addresses the pressing need to establish robust processing–structure–property relationships to guide the science-based design of new HEAs with targeted mechanical behavior.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1543914
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 36 Vol. 115; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English

References (48)

Microstructure evolution and critical stress for twinning in the CrMnFeCoNi high-entropy alloy journal October 2016
Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures journal February 2016
Deviation from high-entropy configurations in the atomic distributions of a multi-principal-element alloy journal January 2015
Accelerated exploration of multi-principal element alloys with solid solution phases journal March 2015
Magnetically-driven phase transformation strengthening in high entropy alloys journal April 2018
Mechanism of Radiation Damage Reduction in Equiatomic Multicomponent Single Phase Alloys journal April 2016
Special quasirandom structures journal July 1990
A fracture-resistant high-entropy alloy for cryogenic applications journal September 2014
Hybrid Monte Carlo/molecular dynamics simulation of a refractory metal high entropy alloy text January 2013
Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes journal May 2004
Hybrid Monte Carlo/Molecular Dynamics Simulation of a Refractory Metal High Entropy Alloy journal October 2013
Atomic-scale compositional characterization of a nanocrystalline AlCrCuFeNiZn high-entropy alloy using atom probe tomography journal July 2013
Atomic-scale properties of Ni-based FCC ternary, and quaternary alloys journal October 2015
Ab initio thermodynamics of the CoCrFeMnNi high entropy alloy: Importance of entropy contributions beyond the configurational one journal November 2015
Atomic-scale characterization and modeling of 60° dislocations in a high-entropy alloy journal May 2016
A critical review of high entropy alloys and related concepts journal January 2017
Dislocation cross-slip in fcc solid solution alloys journal April 2017
Reasons for the superior mechanical properties of medium-entropy CrCoNi compared to high-entropy CrMnFeCoNi journal April 2017
The evolution of the deformation substructure in a Ni-Co-Cr equiatomic solid solution alloy journal June 2017
Stacking fault energies of face-centered cubic concentrated solid solution alloys journal August 2017
Critical stress for twinning nucleation in CrCoNi-based medium and high entropy alloys journal May 2018
Tailoring structural inhomogeneities in metallic glasses to enable tensile ductility at room temperature journal December 2016
Microstructural development in equiatomic multicomponent alloys journal July 2004
On deformation behavior of Fe-Mn based structural alloys journal December 2017
Microstructures and properties of high-entropy alloys journal April 2014
The origin of negative stacking fault energies and nano-twin formation in face-centered cubic high entropy alloys journal March 2017
Chemical short-range orders and the induced structural transition in high-entropy alloys journal February 2018
Metastable high-entropy dual-phase alloys overcome the strength–ductility trade-off journal May 2016
Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi journal December 2015
Enhancing radiation tolerance by controlling defect mobility and migration pathways in multicomponent single-phase alloys journal December 2016
Dislocation mechanisms and 3D twin architectures generate exceptional strength-ductility-toughness combination in CrCoNi medium-entropy alloy journal February 2017
Polymorphism in a high-entropy alloy journal June 2017
Influence of chemical disorder on energy dissipation and defect evolution in concentrated solid solution alloys journal October 2015
Reducing Dzyaloshinskii-Moriya interaction and field-free spin-orbit torque switching in synthetic antiferromagnets journal May 2021
Strain mapping at nanometer resolution using advanced nano-beam electron diffraction journal June 2015
High-entropy alloys: a critical assessment of their founding principles and future prospects journal April 2016
Monte Carlo sampling methods using Markov chains and their applications journal April 1970
Special points for Brillouin-zone integrations journal June 1976
Ab initiomolecular dynamics for liquid metals journal January 1993
Ab initio molecular-dynamics simulation of the liquid-metal–amorphous-semiconductor transition in germanium journal May 1994
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Mechanism of Radiation Damage Reduction in Equiatomic Multicomponent Single Phase Alloys journal April 2016
Local Structure and Short-Range Order in a NiCoCr Solid Solution Alloy journal May 2017
Special quasirandom structures journal July 1990
Generalized Gradient Approximation Made Simple journal October 1996
Hybrid Monte Carlo/Molecular Dynamics Simulation of a Refractory Metal High Entropy Alloy text January 2014
Hybrid Monte Carlo/Molecular Dynamics Simulation of a Refractory Metal High Entropy Alloy text January 2014
Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures text January 2016

Cited By (24)

Yield strength and misfit volumes of NiCoCr and implications for short-range-order journal May 2020
Temperature Effect on Stacking Fault Energy and Deformation Mechanisms in Titanium and Titanium-aluminium Alloy journal February 2020
Semiconducting SiGeSn high-entropy alloy: A density functional theory study journal December 2019
Dislocation plasticity in FeCoCrMnNi high-entropy alloy: quantitative insights from in situ transmission electron microscopy deformation journal April 2020
Direct imaging of short-range order and its impact on deformation in Ti-6Al journal December 2019
Cooperative deformation in high-entropy alloys at ultralow temperatures journal March 2020
Generalized Stacking Fault Energy of Al-Doped CrMnFeCoNi High-Entropy Alloy journal December 2019
Strengthening in multi-principal element alloys with local-chemical-order roughened dislocation pathways text January 2019
Chemical complexity in high entropy alloys: A pair-interaction perspective preprint January 2019
Theory of transformation-mediated twinning preprint January 2019
Complex Strengthening Mechanisms in the NbMoTaW Multi-Principal Element Alloy preprint January 2019
On-lattice voxelated convolutional neural networks for prediction of phase diagrams and diffusion barriers in cubic alloys preprint January 2021
Grain boundary structure in high-entropy alloys journal January 2020
Critical Review of Chemical Complexity Effect on Local Structure of Multi-principal-Element Alloys journal August 2019
Strengthening in multi-principal element alloys with local-chemical-order roughened dislocation pathways journal August 2019
Tailoring heterogeneities in high-entropy alloys to promote strength–ductility synergy journal December 2019
Tuning element distribution, structure and properties by composition in high-entropy alloys journal October 2019
Melts of CrCoNi-based high-entropy alloys: Atomic diffusion and electronic/atomic structure from ab initio simulation journal September 2018
Plastic deformation transition in FeCrCoNiAl x high-entropy alloys journal July 2019
Ab initio -informed phase-field modeling of dislocation core structures in equal-molar CoNiRu multi-principal element alloys journal August 2019
An optimized random structures generator governed by chemical short-range order for multi-component solid solutions journal September 2019
Impact of interstitial C on phase stability and stacking-fault energy of the CrMnFeCoNi high-entropy alloy journal November 2019
Impact of Chemical Fluctuations on Stacking Fault Energies of CrCoNi and CrMnFeCoNi High Entropy Alloys from First Principles journal August 2018
Influence of Ti on the Tensile Properties of the High-Strength Powder Metallurgy High Entropy Alloys journal January 2020

Similar Records

Towards stacking fault energy engineering in FCC high entropy alloys
Journal Article · Wed Nov 17 19:00:00 EST 2021 · Acta Materialia · OSTI ID:1833537

Stacking fault energies of face-centered cubic concentrated solid solution alloys
Journal Article · Wed Jun 21 20:00:00 EDT 2017 · Acta Materialia · OSTI ID:1366415

Rejuvenation as the origin of planar defects in the CrCoNi medium entropy alloy
Journal Article · Thu Feb 15 19:00:00 EST 2024 · Nature Communications · OSTI ID:2305771