|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys II
||Mechanical Properties of Co-based Superalloys with FCC+L12 Two-phase Microstructures
||Haruyuki Inui, Norihiko Okamoto
|On-Site Speaker (Planned)
The creep properties of ‘Co-base superalloys’ consisting of FCC solid-solution based on Co and L12-(Co3(Al,W) cuboidal precipitates have recently been reported to be not so high, being only comparable to that of the Ni-base superalloy of the 1 st generation. There may be many factors for this such as the low γ’-solvus temperature and the low CSF (complex stacking fault) energy of the γ’ phase, both of which are related to the phase stability of the L12 phase. We believe that the insufficient high-temperature mechanical properties of Co-based superalloys are due to the low strength of the constituent L12 compound at high temperatures, which comes from the very low CSF energy, as is evident from the four-fold dissociation of <110> dislocations. We will discuss some strategies for strengthening Co-based alloys with L12 cuboidal precipitates in the lights of our experimental findings.