Rojhirunsakool, T. Singh, A. R. P. Nag, S. Hwang, J. Y. Tiley, J. Banerjee, R. 2024-01-20T08:33:00Z 2024-01-20T08:33:00Z 2021-09-02 2014-11 0966-9795 https://pubs.kist.re.kr/handle/201004/126193 The temporal evolution of non-equilibrium gamma' precipitates in a rapidly quenched and isothermally annealed commercial nickel base superalloy has been investigated by coupling transmission electron microscopy and atom probe tomography. When subjected to rapid quenching from above the gamma' solvus temperature, the supersaturated single phase gamma matrix appears to undergo compositional phase separation possibly via spinodal decomposition to form solute-rich and solute-depleted regions. The regions that have a depletion in Cr and Co undergo an ordering process resulting in the gamma' domains which exhibit a far from equilibrium composition. Upon isothermal annealing, the gamma/gamma' interface sharpens and the compositions of both gamma and gamma' phases approach equilibrium. The influence of a non-classical mechanism of gamma' precipitation on the size distribution of precipitates as well as the precipitate and matrix compositions, and its subsequent evolution during isothermal annealing has been discussed. (C) 2014 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD 3-DIMENSIONAL ATOM-PROBE SPINODAL DECOMPOSITION PHASE-SEPARATION SIZE DISTRIBUTIONS NONUNIFORM SYSTEM TITANIUM ALLOYS FREE ENERGY AL STAGE Temporal evolution of non-equilibrium gamma ' precipitates in a rapidly quenched nickel base superalloy Article 10.1016/j.intermet.2014.06.011 1 INTERMETALLICS, v.54, pp.218 - 224 INTERMETALLICS 54 218 224 scie scopus 000340983800031 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article 3-DIMENSIONAL ATOM-PROBE SPINODAL DECOMPOSITION PHASE-SEPARATION SIZE DISTRIBUTIONS NONUNIFORM SYSTEM TITANIUM ALLOYS FREE ENERGY AL STAGE Annealing Order/disorder transformation Phase transformation Microstructure Atom probe Electron microscopy transmission