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Design of refractory high-entropy alloys

Journal Article · · JOM. Journal of the Minerals, Metals & Materials Society
 [1];  [1];  [2];  [2];  [2];  [2]
  1. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
  2. National Energy Technology Lab. (NETL), Albany, OR (United States)
Here, this report presents a design methodology for refractory high-entropy alloys with a body-centered cubic (bcc) structure using select empirical parameters (i.e., enthalpy of mixing, atomic size difference, Ω-parameter, and electronegativity difference) and CALPHAD approach. Sixteen alloys in equimolar compositions ranging from quinary to ennead systems were designed with experimental verification studies performed on two alloys using x-ray diffraction, energy-dispersive spectroscopy, and scanning electron microscopy. Two bcc phases were identified in the as-cast HfMoNbTaTiVZr, whereas multiple phases formed in the as-cast HfMoNbTaTiVWZr. Observed elemental segregation in the alloys qualitatively agrees with CALPHAD prediction. Comparisons of the thermodynamic mixing properties for liquid and bcc phases using the Miedema model and CALPHAD are presented. This study demonstrates that CALPHAD is more effective in predicting HEA formation than empirical parameters, and new single bcc HEAs are suggested: HfMoNbTiZr, HfMoTaTiZr, NbTaTiVZr, HfMoNbTaTiZr, HfMoTaTiVZr, and MoNbTaTiVZr.
Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FE0004000
OSTI ID:
1258464
Journal Information:
JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 11 Vol. 67; ISSN 1047-4838
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (14)

Strong and Ductile Non-equiatomic High-Entropy Alloys: Design, Processing, Microstructure, and Mechanical Properties journal August 2017
Giant Enhancement of Exchange Coupling in Entropy-Stabilized Oxide Heterostructures journal October 2017
Influence of Cr Substitution and Temperature on Hierarchical Phase Decomposition in the AlCoFeNi High Entropy Alloy journal October 2018
The Effects of Mo and Nb on the Microstructures and Properties of CrFeCoNi(Nb,Mo) Alloys journal August 2018
Novel Ultralight-Weight Complex Concentrated Alloys with High Strength journal April 2019
High-Entropy Metal Diborides: A New Class of High-Entropy Materials and a New Type of Ultrahigh Temperature Ceramics journal November 2016
High-entropy alloys: a critical assessment of their founding principles and future prospects journal April 2016
Computational modeling of high-entropy alloys: Structures, thermodynamics and elasticity journal October 2017
Current and emerging practices of CALPHAD toward the development of high entropy alloys and complex concentrated alloys journal June 2018
Development and exploration of refractory high entropy alloys—A review journal June 2018
Modeling the structure and thermodynamics of high-entropy alloys journal July 2018
MoNbTaV Medium-Entropy Alloy journal May 2016
Design of Light-Weight High-Entropy Alloys journal September 2016
Solidification Microstructures of the Ingots Obtained by Arc Melting and Cold Crucible Levitation Melting in TiNbTaZr Medium-Entropy Alloy and TiNbTaZrX (X = V, Mo, W) High-Entropy Alloys journal May 2019

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