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Empirical design of single phase high-entropy alloys with high hardness
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. University of Science and Technology Beijing, China.
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2015 (English)In: Intermetallics (Barking), ISSN 0966-9795, E-ISSN 1879-0216, Vol. 58, 1-6 p.Article in journal (Refereed) Published
Abstract [en]

We collect the available basic properties of nearly 100 high-entropy alloys (HEAs) with a single face centered cubic (fcc) or body centered cubic (bcc) phase. HEAs crystallizing in the fcc structure are mainly composed of the late 3d elements (LTM-HEAs), whereas HEAs consisting of the early (refractory) transition elements and the LTM-HEAs containing an increased level of bcc stabilizer form the bcc structure. Guided by the solid solution theory, we investigate the structure and hardness of HEAs as a function of the valence electron concentration (VEC) and the atomic size difference (delta). The fcc structure is found for VEC between 7.80 and 9.50, whereas the structure is bcc for VEC between 4.33 and 7.55. High strength is obtained for an average valence electron number VEC similar to 6.80 and for an average atomic size difference delta approximate to 6%. Based on these empirical correlations, one can design the high-entropy alloys with desired hardness.

Place, publisher, year, edition, pages
2015. Vol. 58, 1-6 p.
Keyword [en]
High-entropy alloys, Valence electron concentration, Atomic size difference, Hardness
National Category
Metallurgy and Metallic Materials Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-160734DOI: 10.1016/j.intermet.2014.10.010ISI: 000348626600001Scopus ID: 2-s2.0-84914096764OAI: oai:DiVA.org:kth-160734DiVA: diva2:792093
Funder
Swedish Research CouncilEU, European Research CouncilThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)
Note

QC 20150303

Available from: 2015-03-03 Created: 2015-02-27 Last updated: 2017-12-04Bibliographically approved

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Vitos, Levente

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