Journal
INTERMETALLICS
Volume 58, Issue -, Pages 1-6Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2014.10.010
Keywords
High-entropy alloys; Valence electron concentration; Atomic size difference; Hardness
Categories
Funding
- Swedish Foundation for International Cooperation in Research and Higher Education (STINT)
- Swedish Research Council
- European Research Council
- China Scholarship Council
- National 973 Project of China [2011CB606401]
- National Natural Science Foundation of China [51401014]
- Hungarian Scientific Research Fund (OTKA) [84078, 109570]
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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. (C) 2014 Elsevier Ltd. All rights reserved.
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