The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys
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. Furthe...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
2018
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| _version_ | 1797056279870439424 |
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| author | Goodfellow, A Galindo-Nava, E Christofidou, K Jones, N Boyer, C Martin, T Bagot, P Hardy, M Stone, H |
| author_facet | Goodfellow, A Galindo-Nava, E Christofidou, K Jones, N Boyer, C Martin, T Bagot, P Hardy, M Stone, H |
| author_sort | Goodfellow, A |
| collection | OXFORD |
| description | 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 γʹ 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 γʹ precipitate phase is a key contributor to the overall strength, and that variations in composition between the tertiary and secondary γʹ lead to significant changes in mechanical properties that should be accounted for in models of alloy strength. |
| first_indexed | 2024-03-06T19:21:08Z |
| format | Journal article |
| id | oxford-uuid:1a20a856-08cc-49e9-b725-b0e226f860e6 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:21:08Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:1a20a856-08cc-49e9-b725-b0e226f860e62022-03-26T10:53:03ZThe effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1a20a856-08cc-49e9-b725-b0e226f860e6EnglishSymplectic Elements at OxfordElsevier2018Goodfellow, AGalindo-Nava, EChristofidou, KJones, NBoyer, CMartin, TBagot, PHardy, MStone, HThe 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 γʹ 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 γʹ precipitate phase is a key contributor to the overall strength, and that variations in composition between the tertiary and secondary γʹ lead to significant changes in mechanical properties that should be accounted for in models of alloy strength. |
| spellingShingle | Goodfellow, A Galindo-Nava, E Christofidou, K Jones, N Boyer, C Martin, T Bagot, P Hardy, M Stone, H The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys |
| title | The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys |
| title_full | The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys |
| title_fullStr | The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys |
| title_full_unstemmed | The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys |
| title_short | The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys |
| title_sort | effect of phase chemistry on the extent of strengthening mechanisms in model ni cr al ti mo based superalloys |
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