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

VL - 36.2021

SP - 2529

EP - 2544

JO - Journal of Materials Research

JF - Journal of Materials Research

SN - 0884-2914

IS - 12

ER -