Diffusion Multiples as a Tool to Efficiently Explore the Composition Space of High Entropy Alloys
(2021) Journal of Phase Equilibria and Diffusion — Vol. online (2021)
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- The concept of high entropy alloys (HEAs) has already provided specific alloys presenting improved structural and functional properties. However, the discovery and development of new HEAs still represent a big challenge due to their chemical complexity. Diffusion multiples can be used as an experimental approach to screen large composition ranges. The method consists in heat-treating intimately bonded metallic blocks to activate diffusion, thus creating gradients of compositions. Local chemical and physical properties can be directly probed using advanced characterization techniques. The measured characteristics and properties can be further analysed to estimate diffusion properties or mechanical properties. In the present study, four different diffusion multiples related to the Cantor alloy system, Cr-Fe-Mn-Co-Ni, were investigated. Resulting microstructures were investigated after several heat treatments to assess the claimed entropy-based stabilization of a single phase. Crystallographic characterization by EBSD coupled to EDX mapping were compared to Calphad predictions. Local nano-indentation mapping was carried out and compared to the prediction of the yield strength model proposed by Walbrühl et al.
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Hilhorst, A., & Jacques, P. (2021). Diffusion Multiples as a Tool to Efficiently Explore the Composition Space of High Entropy Alloys. Journal of Phase Equilibria and Diffusion, online. https://doi.org/10.1007/s11669-021-00902-z (Original work published 2021)