Elemental Sub-Lattice Occupation and Microstructural Evolution in Γ/γ′ Co–12Ti–4Mo–Cr Alloys
Microscopy and microanalysis(2022)
摘要
We report on comparative atom probe tomography investigations of γ/γ′-forming Co–12Ti–4Mo–Cr alloys. Moderate additions of Cr (2 and 4 at%) reduced the γ/γ′ lattice misfit and increased the γ′ volume fraction of a Co–12Ti–4Mo 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.
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关键词
atom probe tomography (APT),co-based superalloy,lattice misfit,site-occupancy,spatial distribution map (SDM)
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