Thermodynamic study of single crystal, Ni-based superalloys in the ?+?? two-phase region using Knudsen Effusion Mass Spectrometry, DSC and SEM

Abstract Second and third generation single crystal (SX) Ni-based superalloys are considered to be sensitive microsegregation, incipient melting microstructural instability. Thus, their thermodynamic properties stability at high temperatures of key importance. Vapour composition consisting four species has been detected in the temperature range 1453–1573 K. This was found after studies three CMSX-4, CMSX?10K ® CMSX?10N  using method Knudsen Effusion Mass Spectrometry (KEMS). The activities Ni, Co, Cr, Al have determined ?+??, two-phase region. A series Differential Scanning Calorimetry (DSC) measurements were carried out various ramping up rates determine phase transition temperatures; ?? solvus, solidus liquidus obtained. Back-scattered Electron Imaging (BEI) Energy Dispersive Spectroscopy (EDS) performed depicted effect post KEMS for such complex multicomponent systems.