CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Low-Temperature Criticality of Martensitic Transformations of Cu Nanoprecipitates in alpha-Fe

Paul Erhart (Institutionen för teknisk fysik, Material- och ytteori) ; B. Sadigh
Physical Review Letters (0031-9007). Vol. 111 (2013), 2, p. 025701.
[Artikel, refereegranskad vetenskaplig]

Nanoprecipitates form during nucleation of multiphase equilibria in phase segregating multicomponent systems. In spite of their ubiquity, their size-dependent physical chemistry, in particular, at the boundary between phases with incompatible topologies, is still rather arcane. Here, we use extensive atomistic simulations to map out the size-temperature phase diagram of Cu nanoprecipitates in alpha-Fe. The growing precipitates undergo martensitic transformations from the body-centered cubic (bcc) phase to multiply twinned 9R structures. At high temperatures, the transitions exhibit strong first-order character and prominent hysteresis. Upon cooling, the discontinuities become less pronounced and the transitions occur at ever smaller cluster sizes. Below 300 K, the hysteresis vanishes while the transition remains discontinuous with a finite but diminishing latent heat. This unusual size-temperature phase diagram results from the entropy generated by the soft modes of the bcc-Cu phase, which are stabilized through confinement by the alpha-Fe lattice.

Den här publikationen ingår i följande styrkeområden:

Läs mer om Chalmers styrkeområden  

Denna post skapades 2013-08-15. Senast ändrad 2014-09-02.
CPL Pubid: 181511


Läs direkt!

Lokal fulltext (fritt tillgänglig)

Länk till annan sajt (kan kräva inloggning)

Institutioner (Chalmers)

Institutionen för teknisk fysik, Material- och ytteori (1900-2015)


Defekter och diffusion
Struktur- och vibrationsfysik
Metallurgi och metalliska material

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)