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The Effect of Temperature and Mo Content on the Lattice Misfit of Model Ni-Based Superalloys

1
Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
2
ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
3
Rolls-Royce plc, PO Box 31, Derby DE24 8BJ, UK
*
Author to whom correspondence should be addressed.
Metals 2019, 9(6), 700; https://doi.org/10.3390/met9060700
Received: 28 April 2019 / Revised: 16 June 2019 / Accepted: 18 June 2019 / Published: 21 June 2019
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Abstract

The lattice parameters and misfit of the γ and γ′ phases in a series of model quaternary Ni-based superalloys with and without Mo additions have been determined using neutron diffraction between room temperature and 700 °C. Despite the fact that Mo is typically expected to partition almost exclusively to the γ phase and thereby increase the lattice parameter of that phase alone, the lattice parameters of both the γ and γ′ phases were observed to increase with Mo addition. Nevertheless, the effect on the γ lattice parameter was more pronounced, leading to an overall decrease in the lattice misfit with increasing Mo content. Alloys with the lowest Mo content were found to be positively misfitting, whilst additions of 5 at.% Mo produced a negative lattice misfit. A general decrease in the lattice misfit with increasing temperature was also observed. View Full-Text
Keywords: superalloys; nickel alloys; neutron diffraction; lattice misfit superalloys; nickel alloys; neutron diffraction; lattice misfit
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Goodfellow, A.J.; Owen, L.R.; Christofidou, K.A.; Kelleher, J.; Hardy, M.C.; Stone, H.J. The Effect of Temperature and Mo Content on the Lattice Misfit of Model Ni-Based Superalloys. Metals 2019, 9, 700.

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