About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
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Presentation Title |
Assessing Segregation-induced Softening in Nanocrystalline Stabilized NiP by Nanoindentation |
Author(s) |
Ilias Bikmukhametov, Thomas R Koenig, Garritt Tucker, Gregory Thompson |
On-Site Speaker (Planned) |
Ilias Bikmukhametov |
Abstract Scope |
Phosphorous segregation to grain boundaries (GBs) in NiP nanocrystalline (NC) thin films has been shown to retard elevated temperature grain growth. In the current work, we studied the effect of P segregation on the mechanical properties using nano-indentation with post mortem transmission electron microscopy (TEM), including precession electron diffraction (PED), to reveal the deformation-induced microstructural changes. When P was found in solution, the NC film exhibited approximately 20 % higher average hardness than those films that underwent a thermal anneal to partition the P to the GBs. No evidence of deformation-induced grain growth was seen in either case. The interplay of solid solution strengthening and GB-mediated deformation is discussed. Furthermore, five-fold twin arrangements or quintuple twin junctions were found in the film structures, having a high density in Ni-1%P films and almost being absent in the Ni-4%P film. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Thin Films and Interfaces |