High resolution electron microscopy in the investigation of splitting particles in Ni alloys

H. A. Calderon, L. Calzado-Lopez, C. Kisielowski, G. Kostorz, T. Mori

Producción científica: Contribución a una conferenciaArtículorevisión exhaustiva

Resumen

The mechanism of coarsening of coherent particles in solids is investigated via high-resolution electron microscopy (HREM). The origin of the so-called splitting pattern arrangement of γ' precipitate particles has been studied. This arrangement has often been interpreted as being due to splitting of a larger particle into smaller ones. HREM images along a zone axis parallel to [001] of neighboring particles are used to ascertain whether they are in-phase or out-of-phase by means of a translation order domain analysis. Ni alloys have been used for investigation including a binary Ni-Al alloy (producing different volume fractions) and two commercial multicomponent alloys with high volume fraction. About 72% of two-particle pairs forming the splitting configuration are in the out-of-phase relationship, indicating that adjacent pairs are formed at random most likely through homogeneous nucleation. Thus it is concluded that they are not formed by splitting of a large particle. In addition, a simple elasticity analysis shows that the elastic interaction energy of two γ' particles exhibits a minimum at a certain separation distance along 〈100〉. Therefore such grouping of particles in arrays can be explained on the basis of particle migration.

Idioma originalInglés
Páginas773-778
Número de páginas6
EstadoPublicada - 2005
EventoInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, Estados Unidos
Duración: 29 may. 20053 jun. 2005

Conferencia

ConferenciaInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
País/TerritorioEstados Unidos
CiudadPhoenix, AZ
Período29/05/053/06/05

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