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Title: Ta-Nb-Mo-W refractory high-entropy alloys: Anomalous ordering behavior and its intriguing electronic origin

Journal Article · · Physical Review Materials
 [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)

From electronic-structure-based thermodynamic linear response, we establish chemical ordering behavior in complex solid solutions versus how Gibbs' space is traversed—applying it on prototype refractory A2 Ta-Nb-Mo-W high-entropy alloys. Near ideal stoichiometry, this alloy has anomalous, intricate chemical ordering tendencies, with long-ranged chemical interactions that produce competing short-range order (SRO) with a crossover to spinodal segregation. This atypical SRO arises from canonical band behavior that, with alloying, creates features near the Fermi surface (well defined even with disorder) that change to simple commensurate SRO with (un)filling of these states. In conclusion, our results reveal how complexity and competing electronic effects control ordering in these alloys.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1439596
Alternate ID(s):
OSTI ID: 1439743
Report Number(s):
IS-J-9663; PRMHAR; TRN: US1900627
Journal Information:
Physical Review Materials, Vol. 2, Issue 5; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (4)

Elemental Distribution in CrNbTaTiW-C High Entropy Alloy Thin Films journal February 2019
Design of high-strength refractory complex solid-solution alloys journal March 2018
Impact of lattice relaxations on phase transitions in a high-entropy alloy studied by machine-learning potentials journal May 2019
Tuning phase stability and short-range order through Al doping in ( CoCrFeMn ) 100 − x A l x high-entropy alloys journal July 2019

Figures / Tables (5)


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