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On the mechanism of superelasticity in gum metal

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Talling, R. J., Dashwood, R. J., Jackson, M. and Dye, D. (2009) On the mechanism of superelasticity in gum metal. Acta Materialia, Vol.57 (No.4). pp. 1188-1198. doi:10.1016/j.actamat.2008.11.013

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Official URL: http://dx.doi.org/10.1016/j.actamat.2008.11.013

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Abstract

The deformation mechanisms of the beta-Ti alloy, Gum metal, were investigated with the aid of in situ synchrotron X-ray diffraction (SXRD) and transmission electron microscopy (TEM). SXRD showed that Gum metal undergoes it reversible stress-induced martensitic (alpha '') phase transformation. Oxygen increases the resistance to shear by increasing C' and limits the extent of alpha '' growth. Prior deformation aids alpha '' formation of by providing nuclei, such as {112} < 111 > twins and stress-induced omega plates. The formation of twins and omega plates, both observed in TEM, are believed to be a result of a low G(111) in this alloy. Features similar to the "giant faults" seen previously were observed in TEM their formation is believed to be a result of {112} < 111 > shear. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved,

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title: Acta Materialia
Publisher: Pergamon
ISSN: 1359-6454
Official Date: February 2009
Dates:
DateEvent
February 2009Published
Volume: Vol.57
Number: No.4
Number of Pages: 11
Page Range: pp. 1188-1198
DOI: 10.1016/j.actamat.2008.11.013
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Systems Engineering for Autonomous Systems (SEAS) Defence Technology Centre of the UK Ministry of Defence, U.S. Office of Naval Research
Grant number: N00014-04-1-0155 (U.S. ONR)

Data sourced from Thomson Reuters' Web of Knowledge

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