TY - JOUR
T1 - Quantifying the effect of oxygen on micro-mechanical properties of a near-alpha titanium alloy
AU - Garner, Hazel
AU - Gopon, Phillip
AU - Radecka, null
AU - Fox, null
AU - Rugg, null
AU - Wade, Jon
AU - Armstrong, David
AU - Moody, Michael
AU - Bagot, Paul
N1 - Publisher Copyright:
© 2021, The Author(s).
PY - 2021/6/28
Y1 - 2021/6/28
N2 - Titanium alloys are widely used in the aerospace industry, yet oxygen ingress can severely degrade the mechanical properties of titanium alloy components. Atom probe tomography (APT), electron probe microanalysis (EPMA) and nanoindentation were used to characterise the oxygen-rich layer on an in-service jet engine compressor disc, manufactured from the titanium alloy TIMETAL 834. Oxygen ingress was quantified and related to changes in mechanical properties through nanoindentation studies. The relationship between oxygen concentration, microstructure, crystal orientation and hardness has been explored through correlative hardness mapping, EPMA and electron backscatter diffraction (EBSD). It has been found that the hardening effects of microstructure and crystallography are only significant at very low-oxygen concentrations, whereas interstitial solid solution hardening dominates by order of magnitude for higher oxygen concentrations. The role of microstructure on oxygen ingress has been studied and oxygen ingress along a potential α/β interface was directly observed on the nanoscale using APT.
AB - Titanium alloys are widely used in the aerospace industry, yet oxygen ingress can severely degrade the mechanical properties of titanium alloy components. Atom probe tomography (APT), electron probe microanalysis (EPMA) and nanoindentation were used to characterise the oxygen-rich layer on an in-service jet engine compressor disc, manufactured from the titanium alloy TIMETAL 834. Oxygen ingress was quantified and related to changes in mechanical properties through nanoindentation studies. The relationship between oxygen concentration, microstructure, crystal orientation and hardness has been explored through correlative hardness mapping, EPMA and electron backscatter diffraction (EBSD). It has been found that the hardening effects of microstructure and crystallography are only significant at very low-oxygen concentrations, whereas interstitial solid solution hardening dominates by order of magnitude for higher oxygen concentrations. The role of microstructure on oxygen ingress has been studied and oxygen ingress along a potential α/β interface was directly observed on the nanoscale using APT.
UR - http://www.scopus.com/inward/record.url?scp=85101018283&partnerID=8YFLogxK
U2 - 10.1557/s43578-020-00006-3
DO - 10.1557/s43578-020-00006-3
M3 - Article
SN - 0884-2914
VL - 36.2021
SP - 2529
EP - 2544
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 12
ER -