Rojhirunsakool, T. Meher, S. Hwang, J. Y. Nag, S. Tiley, J. Banerjee, R. 2024-01-20T13:05:05Z 2024-01-20T13:05:05Z 2021-09-01 2013-01 0022-2461 https://pubs.kist.re.kr/handle/201004/128526 This study investigates the influence of alloy composition on gamma' precipitation in Ni-8Al-8Cr and Ni-10Al-10Cr at.% during continuous cooling from a supersolvus temperature. When subjected to the same cooling rate, Ni-8Al-8Cr develops a monomodal population, whereas Ni-10Al-10Cr develops a multimodal (primarily bimodal) population of gamma' precipitates. The bimodal gamma' precipitate size distribution in Ni-10Al-10Cr alloy can be attributed to two successive nucleation bursts during continuous cooling while the monomodal gamma' size distribution in Ni-8Al-8Cr results from a single nucleation burst followed by a longer time-wider temperature window for nucleation resulting in a larger number density of precipitates. Three-dimensional atom probe investigations reveal that while local equilibrium is achieved across the gamma/gamma' interface, far-field c compositions still retain an excess of Al and a depletion of Cr with respect to equilibrium, thus giving direct experimental evidence of the driving force for subsequent nucleation bursts during continuous cooling in case of Ni-10Al-10Cr. Contrastingly, in case of the Ni-8Al-8Cr alloy, while the c phase retains an excess of Al and a depletion of Cr with respect to equilibrium after continuous cooling to room temperature, the additional driving force is consumed during subsequent isothermal annealing by growth of the large number of gamma' precipitates without any new nucleation. English SPRINGER NICKEL-BASE SUPERALLOY ATOM-PROBE TOMOGRAPHY SIZE DISTRIBUTIONS EVOLUTION Influence of composition on monomodal versus multimodal gamma ' precipitation in Ni-Al-Cr alloys Article 10.1007/s10853-012-6802-7 1 JOURNAL OF MATERIALS SCIENCE, v.48, no.2, pp.825 - 831 JOURNAL OF MATERIALS SCIENCE 48 2 825 831 scie scopus 000312903400029 2-s2.0-84871621743 Materials Science, Multidisciplinary Materials Science Article NICKEL-BASE SUPERALLOY ATOM-PROBE TOMOGRAPHY SIZE DISTRIBUTIONS EVOLUTION 3DAP TEM Superalloy Interface