|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Inverse Coarsening of Gamma-prime Precipitates in Ni-base Superalloys
||Subhashish Meher, Laura J. Carroll, Tresa M. Pollock, Mark C. Carroll
|On-Site Speaker (Planned)
Inverse coarsening of gamma-prime precipitates through the accelerated growth of small scale precipitates at expense of large precipitates has been observed in two high refractory containing nickel-base superalloys with a bimodal gamma-prime size distribution. The particle size distribution narrows to approach a uniform precipitate size distribution at longer ageing times. In elastically constrained nickel-base superalloys, this phenomenon has been found to be driven by reduction of bulk free energy, unlike the conventional reduction of interfacial energy as proposed by LSW theory. Transmission electron microscopy and atom probe tomography have been carried to study this inverse coarsening behavior at 800ºC and compared with LSW coarsening of gamma-prime precipitates in same alloys at 1000ºC.
||Planned: A print-only volume