Here we focus on topics that demonstrate the importance of atom probe tomography for obtaining nanostructural information that provides deep insights into the structure of metallic alloys, leading to a better understanding of their properties.
For example, here we address equilibrium segregation at grain boundaries with the aim of manipulating their interfacial structure, energies, compositions, and properties, thereby enabling beneficial material behavior.
Fig.: Segregation of B at a high-angle grain boundary (GB) in Ni-alloy 617.
(a) Transmission electron microscope (TEM) image of the sample; (b) corresponding atom probe tomography (APT) result; and (c) one-dimensional (1D) concentration profile of the major alloy constituents. Boron improves cohesion across the GB and promotes precipitation ( γ ), such that (d) the high-temperature rupture strength is improved, as demonstrated by comparing alloy 617 (Nicrofer5520Co) with the corresponding B-doped alloy, 617B (Nicrofer5520CoB), between 600°C and 750°C (10 5 h); the yellow arrow in (b) indicates the region from which the compositional profiles are taken.
MRS Bulletin; Max-Planck-Institut für Eisenforschung GmbH
Fig.: Segregation of B at a high-angle grain boundary (GB) in Ni-alloy 617.
(a) Transmission electron microscope (TEM) image of the sample; (b) corresponding atom probe tomography (APT) result; and (c) one-dimensional (1D) concentration profile of the major alloy constituents. Boron improves cohesion across the GB and promotes precipitation ( γ ), such that (d) the high-temperature rupture strength is improved, as demonstrated by comparing alloy 617 (Nicrofer5520Co) with the corresponding B-doped alloy, 617B (Nicrofer5520CoB), between 600°C and 750°C (10 5 h); the yellow arrow in (b) indicates the region from which the compositional profiles are taken.
MRS Bulletin; Max-Planck-Institut für Eisenforschung GmbH
