A second criterion for sigma phase formation in high-entropy alloys

By Ming-Hung Tsai, K. Chang, Jian-hong Li, R. Tsai, An-Hung Cheng. 2016

189 citations recorded by the source corpus.

The presence of the sigma phase in high-entropy alloys significantly affects their mechanical properties. Therefore, control of sigma phase formation is crucial. Current understanding of the stability of the sigma phase is largely based on the valence electron concentration (VEC) criterion. Here, we show that VEC alone is insufficient to describe its stability. A second criterion for sigma phase formation based on alloy composition is proposed. A new parameter called paired sigma-forming element (PSFE) content is invented to quantify this criterion. If PSFE content is lower than the threshold value, the sigma phase will not form even if the VEC is correct.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/923e589cfe04a39056a17c2178847f0cd812973f

How researchers see this paper

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In Aerospace Engineering

1. E. Pickering
2. N. Jones

In Mechanical Engineering

1. E. Pickering
2. N. Jones
3. O. A. Zambrano

Citations in the corpus

• High-entropy alloys: a critical assessment of their founding principles and future prospects (2016, methodology): “For instance, the melting-point D values for Pt diffusion in Cu and W diffusion in Ni recorded by Brown and Ashby215 are below the lowest values measured for D in CrMnFeCoNi by Tsai et al.209 Aside from direct measurements of diffusivities, there is a great deal of experimental evidence that implies”
• The fcc solid solution stability in the Co-Cr-Fe-Mn-Ni multi-component system (2017, unknown): “Thus Tsai et al. proposed to combine the VEC criterion with a second criterion based on alloy composition [26].”