Work

Extreme hardening of titanium with colossal interstitial contents of nitrogen and oxygen

Year: 2021

Type: article

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.

Source: Materials Science and Engineering A

DOI: 10.1016/j.msea.2021.141033

Authors: Frederik B. Kværndrup, Ömer C. Kücükyildiz, Grethe Winther, Marcel A.J. Somers, Thomas L. Christiansen

Institution: Technical University of Denmark

Language: English

Topic: Titanium Alloys Microstructure and Properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,400

Funders: Natur og Univers, Det Frie Forskningsråd, Danmarks Frie Forskningsfond