Effect of NbC and TiC precipitation on shape memory in an iron-based alloy

Stanford, N. and Dunne, D. P. 2006, Effect of NbC and TiC precipitation on shape memory in an iron-based alloy, Journal of materials science, vol. 41, no. 15, pp. 4883-4891.


Title Effect of NbC and TiC precipitation on shape memory in an iron-based alloy
Author(s) Stanford, N.
Dunne, D. P.
Journal name Journal of materials science
Volume number 41
Issue number 15
Start page 4883
End page 4891
Publisher Springer
Place of publication Delft, The Netherlands
Publication date 2006-08
ISSN 0022-2461
1573-4803
Summary This paper examines the effects of TiC and NbC precipitation and prior cold rolling on the shape memory behaviour of an iron-based alloy. A precipitate-free alloy was used as a reference to investigate the relative contributions of prior-deformation and precipitation on shape memory. Heat treatment of the Nb- and Ti-containing alloys at 700 °C and 800 °C resulted in carbide precipitates between 120 nm and 220 nm in diameter. Bend testing of these samples showed a marginal increase in shape memory compared to the precipitate-free alloy. Under these conditions TiC precipitation exhibited slightly better shape memory than for NbC. However, this small increase was over-shadowed by the marked increase in shape memory that can be produced by subjecting the alloys to cold rolling followed by recovery annealing. When processed in this way, fine carbides are formed in the Ti- and Nb-containing alloys during the heat treatment. For particles >25 nm in diameter the shape memory is unaffected, but, it was found that small <5 nm particles have a detrimental effect on shape memory due to pinning of the martensite plates, thereby inhibiting their reversion to austenite. The optimum shape memory was observed in the precipitate-free alloy after cold rolling and recovery annealing.
Language eng
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30025889

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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