First measurement of the full elastic constants of Ni-based superalloy Rene 88DT

The full elastic constants of Ni-based superalloy Rene 88DT were measured for the first time using a recently developed method that matches the computed surface acoustic wave (SAW) velocities from an elastodynamic model with experimental velocities of SAWs that are generated and detected with a femtosecond laser. The experimental measurements were performed on several grains of a polycrystalline sample without the need of growing a single crystal. The computed Young's modulus from the resultant elastic constants agrees with the literature values, lending confidence on our measured elastic constants: C-11 = 267.1, C-12 = 170.5, and C-44 = 107.6 (GPa). (C) 2018 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.