The effect of oxidation on the subsurface microstructure of a Ti-6Al-4V alloy

Bagot, PAJ; Radecka, A; Magyar, AP; Bell, DC; Smith, GDW; Moody, MP; Dye, D; Rugg, D

doi:https://www.dx.doi.org/10.1016/j.scriptamat.2018.01.015

OA Location

https://ora.ox.ac.uk/objects/uuid:529c65f0-e262-40bc-b926-5876bef9d668

Author(s)

Bagot, PAJ

Radecka, A

Magyar, AP

Bell, DC

Smith, GDW

more

Type

Journal Article

Abstract

Atom Probe Tomography (APT) and Transmission Electron Microscopy (TEM) are combined for examining α-case formation in Ti-6Al-4V, generated by air exposure at 800 °C. Below the oxide surface, the microstructure separates into a nanoscale mixture of the α-Ti and α2 Ti3Al phases, of compositions Ti70-O30 and Ti65-O10-Al20-V5 respectively. The α2 phase exists either as bands or as nanoscale spherical precipitates. Nitrogen also penetrates the surface, but to a lesser extent, while vanadium partitions to α2 or in distinctly separate phases. The results demonstrate that oxygen stimulates precipitation of α2, helping to explain embrittlement produced in the O-enriched layer beneath the oxide.

Date Issued

2018-02-09

Date Acceptance

2018-01-11

Citation

Scripta Materialia, 2018, 148, pp.24-28

URI

http://hdl.handle.net/10044/1/57107

DOI

https://www.dx.doi.org/10.1016/j.scriptamat.2018.01.015

ISSN

1359-6462

Publisher

Elsevier

Start Page

24

End Page

28

Journal / Book Title

Scripta Materialia

Volume

148

Copyright Statement

Sponsor

Engineering & Physical Science Research Council (EPSRC)

Engineering & Physical Science Research Council (E

Rolls-Royce Plc

Grant Number

EP/K034332/1

138874

PO 4600198972

Subjects

0912 Materials Engineering

0913 Mechanical Engineering

Materials

Publication Status

Published

Date Publish Online

2018-02-09