Temperature dependence of single crystal elastic constants in a CoNi-Base alloy: A new methodology

A novel experimental setup combining induction heating, contactless (infrared thermometer) temperature measurements, and custom 15 cm length SiC-tipped piezoelectric transducers has been developed to rapidly collect resonant ultrasound spectroscopy (RUS) data from metallic rectangular parallelepiped (RP) specimens heated in air. This is used over 70 of the lowest-frequency resonance modes a single crystal CoNi-based superalloy SB-CoNi-10+—an alloy identified for further study due promising set high properties. RUS spectra room (RT) 927 °C (1200 K) along with dilatometry measurements thermal expansion behavior are supplied robust, open-sourced, Bayesian inference code simultaneous estimation of: three elastic constants, axis misorientation parameters, noise parameter. first application methodology at elevated temperatures, characterize SB-CoNi-10+. monotonic decrease constants (C11,C12,C44) (236.4, 150.8, 134.1) GPa (190.7, 138.1, 95.2) 15% increase anisotropy = 3.131 ? 3.618 observed upon heating RT °C, an increased rate softening above 600 (873 K).