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Title: Atomic-scale properties of Ni-based FCC ternary, and quaternary alloys

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [4];  [5]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Tartu (Estonia)
  2. Univ. of Tartu (Estonia)
  3. Uppsala Univ. (Sweden)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The aim of our study is to characterize some atomic-scale properties of Ni-based FCC multicomponent alloys. For this purpose, we use Monte Carlo method combined with density functional theory calculations to study short-range order (SRO), atomic displacements, electronic density of states, and magnetic moments in equimolar ternary NiCrCo, and quaternary NiCrCoFe alloys. The salient features for the ternary alloy are a negative SRO parameter between Ni Cr and a positive between Cr Cr pairs as well as a weakly magnetic state. For the quaternary alloy we predict negative SRO parameter for Ni Cr and Ni Fe pairs and positive for Cr Cr and Fe Fe pairs. Atomic displacements for both ternary and quaternary alloys are negligible. In contrast to the ternary, the quaternary alloy shows a complex magnetic structure. The electronic structure of the ternary and quaternary alloys shows differences near the Fermi energy between a random solid solution and the predicted structure with SRO. Despite that, the calculated EXAFS spectra does not show enough contrast to discriminate between random and ordered structures. Finally, the predicted SRO has an impact on point-defect energetics, electron phonon coupling and thermodynamic functions and thus, SRO should not be neglected when studying properties of these two alloys.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; 2014 ORNL 1026
OSTI ID:
1265822
Alternate ID(s):
OSTI ID: 1251461
Journal Information:
Acta Materialia, Vol. 99, Issue C; Related Information: EDDE partners with Oak Ridge National Laboratory (lead); Lawrence Livermore National Laboratory; University of Michigan; University of Tennessee; University of Wisconsin; University of Wyoming; Virginia Tech; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 117 works
Citation information provided by
Web of Science

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Local Structure and Short-Range Order in a NiCoCr Solid Solution Alloy journal May 2017
Phase stability and magnetic behavior of FeCrCoNiGe high-entropy alloy journal December 2015
Effects of Mn and Al addition on structural and magnetic properties of FeCoNi-based high entropy alloys journal August 2018
Tuning element distribution, structure and properties by composition in high-entropy alloys journal October 2019
Lattice Distortions in the FeCoNiCrMn High Entropy Alloy Studied by Theory and Experiment journal September 2016
Tunable stacking fault energies by tailoring local chemical order in CrCoNi medium-entropy alloys journal August 2018
Strengthening in multi-principal element alloys with local-chemical-order roughened dislocation pathways journal August 2019
Model interatomic potentials and lattice strain in a high-entropy alloy journal August 2018
Effects of Short-Range Order on the Magnetic and Mechanical Properties of FeCoNi(AlSi)x High Entropy Alloys journal November 2017
Melts of CrCoNi-based high-entropy alloys: Atomic diffusion and electronic/atomic structure from ab initio simulation journal September 2018
Tunable stacking fault energies by tailoring local chemical order in CrCoNi medium-entropy alloys text January 2018
Strengthening in multi-principal element alloys with local-chemical-order roughened dislocation pathways text January 2019
Effect of chemical disorder on the electronic stopping of solid solution alloys journal September 2020