1.
Microsc Microanal
; : 1-5, 2021 Apr 23.
Artículo
en Inglés
| MEDLINE
| ID: mdl-33888180
RESUMEN
We report on comparative atom probe tomography investigations of γ/γ'-forming Co12Ti4MoCr alloys. Moderate additions of Cr (2 and 4 at%) reduced the γ/γ' lattice misfit and increased the γ' volume fraction of a Co12Ti4Mo alloy significantly. These microstructural changes were accompanied by changes in the elemental partitioning between γ and γ' and site-occupancy in γ'. Spatial distribution maps revealed that Mo occupied both Co and Ti sub-lattice sites in γ'. In agreement with the experimental data, thermodynamic calculations predicted a stronger tendency for Mo to occupy the Co-sites than for Cr and an increase in Cr fraction on the Ti-sites with increasing Cr content.