Next Article in Journal
Complexity in Animal Communication: Estimating the Size of N-Gram Structures
Next Article in Special Issue
Microstructures and Crackling Noise of AlxNbTiMoV High Entropy Alloys
Previous Article in Journal
Multiple Solutions of Nonlinear Boundary Value Problems of Fractional Order: A New Analytic Iterative Technique
Previous Article in Special Issue
Nanomechanical Properties and Deformation Behaviors of Multi-Component (AlCrTaTiZr)NxSiy High-Entropy Coatings
Entropy 2014, 16(1), 494-525; doi:10.3390/e16010494
Article

Exploration and Development of High Entropy Alloys for Structural Applications

* ,
,
,
,
 and
Received: 31 October 2013 / Revised: 27 November 2013 / Accepted: 20 December 2013 / Published: 10 January 2014
(This article belongs to the Special Issue High Entropy Alloys)
View Full-Text   |   Download PDF [1916 KB, 24 February 2015; original version 24 February 2015]   |   Browse Figures

Abstract

We develop a strategy to design and evaluate high-entropy alloys (HEAs) for structural use in the transportation and energy industries. We give HEA goal properties for low (≤150 °C), medium (≤450 °C) and high (≥1,100 °C) use temperatures. A systematic design approach uses palettes of elements chosen to meet target properties of each HEA family and gives methods to build HEAs from these palettes. We show that intermetallic phases are consistent with HEA definitions, and the strategy developed here includes both single-phase, solid solution HEAs and HEAs with intentional addition of a 2nd phase for particulate hardening. A thermodynamic estimate of the effectiveness of configurational entropy to suppress or delay compound formation is given. A 3-stage approach is given to systematically screen and evaluate a vast number of HEAs by integrating high-throughput computations and experiments. CALPHAD methods are used to predict phase equilibria, and high-throughput experiments on materials libraries with controlled composition and microstructure gradients are suggested. Much of this evaluation can be done now, but key components (materials libraries with microstructure gradients and high-throughput tensile testing) are currently missing. Suggestions for future HEA efforts are given.
Keywords: structural metals; high-entropy alloys (HEAs); alloy design; high-throughput structural metals; high-entropy alloys (HEAs); alloy design; high-throughput
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote
MDPI and ACS Style

Miracle, D.B.; Miller, J.D.; Senkov, O.N.; Woodward, C.; Uchic, M.D.; Tiley, J. Exploration and Development of High Entropy Alloys for Structural Applications. Entropy 2014, 16, 494-525.

View more citation formats

Related Articles

Article Metrics

For more information on the journal, click here

Comments

Cited By

[Return to top]
Entropy EISSN 1099-4300 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert