Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys
By Sheng Guo, Chun Ng, Jian Lu, C. Liu. 2011
2,499 citations recorded by the source corpus.
Phase stability is an important topic for high entropy alloys (HEAs), but the understanding to it is very limited. The capability to predict phase stability from fundamental properties of constituent elements would benefit the alloy design greatly. The relationship between phase stability and physicochemical/thermodynamic properties of alloying components in HEAs was studied systematically. The mixing enthalpy is found to be the key factor controlling the formation of solid solutions or compounds. The stability of fcc and bcc solid solutions is well delineated by the valance electron concentration (VEC). The revealing of the effect of the VEC on the phase stability is vitally important for alloy design and for controlling the mechanical behavior of HEAs.
Subfields: Aerospace Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/f8785ddb49c59bc4daa385270298a9701823d28f
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Citations in the corpus
- Effects of electro-negativity on the stability of topologically close-packed phase in high entropy alloys (2014, methodology): “introduced the valence electron concentration (VEC) as an additional parameter and then used it to predict the stability of the FCC and BCC solid solution phases [22,23].”
- Formation, structure and properties of biocompatible TiZrHfNbTa high-entropy alloys (2019, background): “At VEC ≥ 4.18, a single BCC phase was formed, whilst when 4.09 ≤ VEC 4.18, mixed BCC and HCP phases co-existed and a single HCP phase would be formed at VEC 4.09.”
- “Self-sharpening” tungsten high-entropy alloy (2020, methodology): “Sole FCC phase exists when VEC 8.0; sole BCC phase exists when VEC < 6.87, and more than one phase Fig.”
- Entropy-driven phase stability and slow diffusion kinetics in an Al0.5CoCrCuFeNi high entropy alloy (2012, methodology): “We have recently addressed to these important issues [5,8], based on considerations of the fundamental properties of the constituent elements, including the atomic size mismatch, mixing entropy, mixing enthalpy, electronegativity and electron concentration.”