Elastic moduli of 6th generation Ni-base single crystal superalloy TMS-238 and its tie-lined γ and γ′ phases

Understanding the precise elastic modulus of individual γ and γ′ phases is crucial for estimating the elastic misfit between these phases, because it is a key factor in controlling the formation of raft structures and local stress/strain around γ′ precipitates. Despite its importance, research in this area remains limited. This study determines the elastic modulus of 6th generation Ni-base single crystal superalloy TMS-238 and its tie-lined γ and γ phases under equilibrium conditions above 900 °C. We fabricated TMS-238 and its tie-lined alloys with varying γ′ volume fractions. Using the rectangular parallelepiped resonance (RPR) method, we measured the elastic modulus from room temperature to 1100 °C. Elastic moduli between tie-lined phases were then estimated above 900 °C using composite models. Our findings were compared with those of Ni-Al binary alloys , Ni-Al-X ternary alloys , and multi-component systems, providing a comprehensive understanding of the elastic properties .