New mechanism and criterion for forming multi-component solid-solution alloys

Some existing criteria for forming single-phase multicomponent solid-solution alloys (MCSSAs) are assessed, and a new criterion based on the topology of atomic packing is propounded. A new mechanism concerning the development of MCSSAs is posited, where the multicomponent effect in surface layer, reducing the surface free energy of nanocrystalline nucleus, plays a significant role. More reasonable interpretation regarding the phase stability of CoCrFeMnNi alloy annealed at different temperatures is provided. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

This paper assesses existing criteria for forming single-phase multicomponent solid-solution alloys (MCSSAs) and proposes a new criterion based on the topology of atomic packing. A new mechanism is posited where the multicomponent effect in the surface layer reduces the surface free energy of nanocrystalline nucleus, playing a significant role in the development of MCSSAs. Additionally, a more reasonable interpretation regarding the phase stability of the CoCrFeMnNi alloy annealed at different temperatures is provided.