On Local Phase Equilibria and the Appearance of Nanoparticles in the Microstructure of Single-Crystal Ni-Base Superalloys
Victoria Yardley, Ivan Povstugar, Pyuck-Pa Choi, Dirk Raabe, Alireza B. Parsa, Aleksander Kostka, Christoph Somsen, Antonin Dlouhy, Klaus Neuking, Easo P. George and Gunther Eggeler
Version of Record online: 22 JUL 2016 | DOI: 10.1002/adem.201600237
Ni-base superalloy single crystals consist of the γ′ (cuboidal particles) and the γ phase (thin channels). Their volume fractions can be measured and calculated. In the present work, the authors use TEM and APT to document the presence of tiny spheroidal (20 nm) nanoparticles and use thermodynamics and kinetics to explain their appearance and their composition.