Entropy-driven grain boundary segregation: prediction of the phenomenon

0545250 - FZÚ 2022 RIV CH eng J - Journal Article
Lejček, Pavel - Hofmann, S.
Entropy-driven grain boundary segregation: prediction of the phenomenon.
Metals. Roč. 11, č. 8 (2021), č. článku 1331. E-ISSN 2075-4701
Institutional support: RVO:68378271
Keywords : embrittlement * grain boundaries * metals and alloys * segregation
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.695, year: 2021
Method of publishing: Open access

The question is formulated as to whether entropy-driven grain boundary segregation can exist. Such a phenomenon would be based on the assumption that a solute can segregate at the grain boundary sites that exhibit positive segregation energy (enthalpy) if the product of segregation entropy and temperature is larger than this energy (enthalpy). The possibility of entropy-driven grain boundary segregation is discussed for several model examples in iron-based systems, which can serve as indirect evidence of the phenomenon. It is shown that entropy-driven grain boundary segregation would be a further step beyond the recently proposed entropy-dominated grain boundary segregation as it represents solute segregation at “anti-segregation” sites.
Permanent Link: http://hdl.handle.net/11104/0322004