Layering transitions at grain boundaries
نویسندگان
چکیده
We review various simplified models that have been advanced to describe layering (complexion) transitions at grain boundaries in multicomponent solids. In particular, we first outline lattice-gas, off-lattice atomistic and thermodynamic models that have been employed to investigate phase-like behavior at segregated grain boundaries. The results of these investigations are summarized in the form of complexion diagrams in different thermodynamic planes, and we highlight important features of these diagrams, such as complexion transition lines and critical points. Finally, we describe current issues and provide
منابع مشابه
Abnormal grain growth in the Potts model incorporating grain boundary complexion transitions that increase the mobility of individual boundaries
The Potts model of grain growth was adapted for the purpose of simulating abnormal grain growth (AGG) resulting from grain boundary complexion transitions. The transition in grain boundary structure between specific complexion types results in changes in properties. Where the transitions decrease energy and increase the mobility of boundaries, AGG occurs provided that such transitions predomina...
متن کاملDemystifying the role of sintering additives with “complexion”
he role of additives has long been a theme in sintering science. Recently, it has been discovered that ceramics may contain multiple different rain boundary phases (complexions) that are chemically induced by certain additives. These complexions are useful in explaining a number of nomalous phenomena associated with sintering, such as abnormal grain growth. The current work investigates how tra...
متن کاملEffect of grain boundary character on segregation-induced structural transitions
Segregation-induced structural transitions in metallic grain boundaries are studied with hybrid atomistic Monte Carlo/molecular dynamics simulations using Cu-Zr as a model system, with a specific emphasis on understanding the effect of grain boundary character. With increasing global composition, the six grain boundary types chosen for this paper first form ordered complexions, with the local s...
متن کاملComputer Simulation of the Thermodynamic Properties of Grain Boundaries
Methods are discussed for the explicit calculation of the excess thermodynamic properties of grain boundaries using molecular dynamics simulations in the NPT ensemble. Specific attention is focussed on techniques for the calculation of excess free energies. Results on the variation of interfacial free energy with misorientation are reported. In addition, observations of phase transitions among ...
متن کاملGrain-boundary layering transitions in a model bicrystal
Article history: Received 15 June 2013 Accepted 4 September 2013 Available online 11 September 2013
متن کامل