Abstract
Homogenous thin foils of titanium with nitrogen and oxygen in
interstitial solid solution were characterized with X-ray diffraction,
light optical microscopy and electron backscatter diffraction. Samples
covering the broad solubility ranges of O and N were synthesized. The
mechanical properties were assessed using nanoindentation and related to
the interstitial content, h.c.p. lattice expansion and grain
orientation. Effects of surface pile-up and sink-in during
nanoindentation were adequately accounted for, yielding hardness and
indentation modulus values for nearly the full range of concentrations,
finding consistency with theoretical expressions and very limited
literature values. The hardening/strengthening achieved by colossal interstitial alloying of O and N correlates with the change in c/a ratio of the h.c.p. Ti lattice as caused by interstitial occupancy.
Original language | English |
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Article number | 141033 |
Journal | Materials Science and Engineering A |
ISSN | 0921-5093 |
DOIs | |
Publication status | Published - 2021 |
Keywords
- Titanium
- Gaseous oxidizing
- Gaseous nitriding
- Vacuum homogenization
- Transmission X-Ray diffraction
- Rietveld refinement
- Nanoindentation
- Electron backscatter diffraction
- Ti-O system
- Ti-N system
- Interstitial solutions
- Mechanical properties