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

Metals

AmyJ. Goodfellow¹  HowardJ. Stone¹  KaterinaA. Christofidou¹  LewisR. Owen¹  Joe Kelleher²  MarkC. Hardy³ 

[1] Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK;ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK;Rolls-Royce plc, PO Box 31, Derby DE24 8BJ, UK;

关键词: superalloys;    nickel alloys;    neutron diffraction;    lattice misfit;   

DOI  :  10.3390/met9060700

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown