Abstract
This chapter describes alloy surface segregation and ordering phenomena: recent progress. The chapter elucidates some recent developments regarding surface segregation phenomena in metallic alloys exhibiting appreciable compositional order. It comprises three main issues: (i) short range order (SRO) effects in multi-component solid solutions, (ii) the role of long range order (LRO) (with emphasis on the underlying energetics), and (iii) preliminary analysis of segregation trends characteristic of bi-phase alloys. In addition, it should be noted that compared to a prominent theoretical progress in elucidating trends associated with segregation or order interplay by means of free-energy concentration expansion method (FCEM) calculations (or by the generally more accurate Monte Carlo simulations with embedded-atom-method energetics), comprehensive experimental studies of the phenomena are still lacking. It can be anticipated that the growing use of advanced techniques sensitive to the atomistic features of surface structural order and composition can be directed to further unraveling of segregation/order issues.
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