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Elasticity, acoustic loss and γ′ dissolution in superalloys from resonant ultrasound spectroscopy

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Driver, SL 
Markanday, JFS 
Mignanelli, PM 


jats:p The high temperature acoustic loss and elastic moduli of the Ni-based superalloys RR1000, Waspaloy, and Allvacjats:sup®</jats:sup> 718Plus™ were investigated using resonant ultrasound spectroscopy. An exponential increase in acoustic loss was seen in all alloys, which was viscoelastic in character with an activation energy of ∼ 200–400 kJ.moljats:sup−1</jats:sup>, similar to that of the self-diffusion of Ni. The magnitude of the loss was found to be proportional to djats:sup−0.85</jats:sup>, where d is the grain size. Deviations from the high temperature background were seen in Waspaloy and 718Plus around their γ′ solvus temperatures, attributed to increased diffusion during γ′ dissolution. It is suggested that acoustic loss in Ni-based alloys may be used as a means of determining the γ′ solvus temperatures. </jats:p>



40 Engineering, 4016 Materials Engineering, 4017 Mechanical Engineering, Biomedical Imaging

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Materials Science and Technology

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SAGE Publications
Engineering and Physical Sciences Research Council (EP/M005607/1)
Engineering and Physical Sciences Research Council (EP/H022309/1)
Natural Environment Research Council (NE/F017081/1)
The authors would like to acknowledge the EPSRC / Rolls-Royce Strategic Partnership for funding EP/H022309/1 and EP/M005607/1). RUS facilities were established in Cambridge through grants from the Natural Environment Research Council of Great Britain (NE/B505738/1 and NE/F017081/1).