1310.2533.pdf (676.65 kB)
Nucleation of austenite in mechanically stabilized martensite by localized heating
conference contribution
posted on 2023-06-09, 05:27 authored by J M Ball, Konstantinos KoumatosKonstantinos Koumatos, H SeinerThe nucleation of bcc austenite in a single crystal of a mechanically stabilized 2H-martensite of Cu–Al–Ni shape-memory alloy is studied. The nucleation process is induced by localized heating and observed by optical microscopy. It is observed that nucleation occurs after a time delay and that the nucleation points are always located at one of the corners of the sample (a rectangular bar in the austenite), regardless of where the localized heating is applied. Using a simplified nonlinear elasticity model, we propose an explanation for the location of the nucleation points, by showing that the martensite is a local minimizer of the energy with respect to localized variations in the interior, on faces and edges of the sample, but not at corners, where a localized microstructure can lower the energy.
History
Publication status
- Published
File Version
- Accepted version
Journal
Journal of Alloys and CompoundsISSN
0925-8388Publisher
ElsevierExternal DOI
Issue
supp1Volume
557Page range
s37-s42Event name
ICOMAT 2011Event location
Osaka, JapanEvent type
conferenceEvent date
4 to 9 September 2011Department affiliated with
- Mathematics Publications
Research groups affiliated with
- Analysis and Partial Differential Equations Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes