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  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.
|Original language||American English|
|Number of pages||695|
|State||Published - 1 Dec 2005|
|Event||Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - |
Duration: 1 Dec 2005 → …
|Conference||Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005|
|Period||1/12/05 → …|
Calderon, H. A., Calzado-Lopez, L., Kisielowski, C., Kostorz, G., & Mori, T. (2005). High resolution electron microscopy in the investigation of splitting particles in Ni alloys. 773-778. Paper presented at Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005, .