Nucleation of austenite in mechanically stabilized martensite by localized heating

Ball, J M, Koumatos, K and Seiner, H (2013) Nucleation of austenite in mechanically stabilized martensite by localized heating. ICOMAT 2011, Osaka, Japan, 4 to 9 September 2011. Published in: Miyazaki, Shuichi, Kakeshita, Tomoyuki and Nishida, Minorui, (eds.) Journal of Alloys and Compounds. 557 (supp1) s37-s42. Elsevier ISSN 0925-8388

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The 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.

Item Type: Conference Proceedings
Schools and Departments: School of Mathematical and Physical Sciences > Mathematics
Research Centres and Groups: Analysis and Partial Differential Equations Research Group
Subjects: Q Science > QA Mathematics
Q Science > QC Physics > QC0120 Descriptive and experimental mechanics
Depositing User: Konstantinos Koumatos
Date Deposited: 19 May 2017 08:28
Last Modified: 19 May 2017 08:28

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