Microstructural evolution in a superelastic metastable beta-Ti alloy
File(s)ti2448_apt_HS_AR_DD_JC_DI_DS_revised.pdf (1.66 MB)
Accepted version
Author(s)
Type
Journal Article
Abstract
The microstructural evolution of Ti-24Nb-4Zr-8Sn wt.% during low-temperature ageing is examined by atom-probe tomography
(APT) and X-ray diffraction (XRD). This ageing is deleterious to the desirable mechanical properties, such
as ultra-low elastic modulus and superelasticity. Initially, the cold-rolled alloy possesses a martensitic α
00-precipitate/β-
matrix microstructure. On ageing, Ti-rich/solute-lean precipitates grow in linear arrangements, which are likely associated
with dislocations. Additionally, the composition and number density of Nb-rich domains (which are associated
with superelasticity) are quantified for the first time. The domains are unstable, but decrease in number density during
ageing, causing the deterioration in mechanical properties.
(APT) and X-ray diffraction (XRD). This ageing is deleterious to the desirable mechanical properties, such
as ultra-low elastic modulus and superelasticity. Initially, the cold-rolled alloy possesses a martensitic α
00-precipitate/β-
matrix microstructure. On ageing, Ti-rich/solute-lean precipitates grow in linear arrangements, which are likely associated
with dislocations. Additionally, the composition and number density of Nb-rich domains (which are associated
with superelasticity) are quantified for the first time. The domains are unstable, but decrease in number density during
ageing, causing the deterioration in mechanical properties.
Date Issued
2016-10-15
Date Acceptance
2016-09-26
Citation
Scripta Materialia, 2016, 128, pp.87-90
ISSN
1359-6462
Publisher
Elsevier
Start Page
87
End Page
90
Journal / Book Title
Scripta Materialia
Volume
128
Copyright Statement
© 2016, Elsevier. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Rolls-Royce Plc
Grant Number
EP/H004882/1
See Further info
Subjects
Science & Technology
Technology
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Science & Technology - Other Topics
Materials Science
Atom-probe tomography
Martensitic phase transformation
Precipitation
Titanium alloys
Ageing
ATOM-PROBE MICROSCOPY
TITANIUM ALLOY
TI-5AL-5MO-5V-3CR
PRECIPITATION
TOMOGRAPHY
INTERFACES
Materials
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status
Published