The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys
Authors
Goodfellow, Amy
Jones, Nick
Boyer, CD
Martin, TL
Hardy, MC
Publication Date
2018-07-01Journal Title
Acta Materialia
ISSN
1359-6454
Publisher
Elsevier
Volume
153
Pages
290-302
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Goodfellow, A., Galindo-Nava, E., Christofidou, K., Jones, N., Boyer, C., Martin, T., Bagot, P., et al. (2018). The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys. Acta Materialia, 153 290-302. https://doi.org/10.1016/j.actamat.2018.04.064
Abstract
The exceptional mechanical properties of polycrystalline nickel-based superalloys arise through various concurrent strengthening mechanisms. Whilst these mechanisms are generally understood, consensus has yet to be established on the precise contribution of each to the overall alloy strength. Furthermore, changes in alloy chemistry influence several different mechanisms, making the assessment of individual alloying elements complex. In this study, a series of model quinary Ni-based superalloys has been investigated to systematically study the effect of varying Mo content on the contributing strengthening mechanisms. Using microstructural data, the yield strength was modelled by summing the individual effects of solid solution in both the γ and γ ' phases, coherency, grain boundary and precipitation strengthening. The total predicted yield stress increased with Mo content despite the diminishing contribution of precipitation strengthening. It is shown that solid solution strengthening of the ordered γ' precipitate phase is a key contributor to the overall strength, and that variations in composition between the tertiary and secondary γ ' lead to significant changes in mechanical properties that should be accounted for in models of alloy strength.
Sponsorship
Funding was provided by the EPSRC/Rolls-Royce Strategic Partnership under EP/M005607/1 and EP/H022309/1. The Oxford Atom Probe facility was funded by the EPSRC under EP/M022803/1. E. I. Galindo-Nava would like to acknowledge the Royal Academy of Engineering for his fellowship funding. Neutron diffraction beam time was supported through the Canadian Neutron Beam Centre under Experiment number 1258.
Funder references
EPSRC (EP/M005607/1)
EPSRC (1504226)
UNIVERSITY OF BIRMINGHAM (FB EPSRC) (EP/H022309/1)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1016/j.actamat.2018.04.064
This record's URL: https://www.repository.cam.ac.uk/handle/1810/275825
Recommended or similar items
The following licence files are associated with this item: