Mechanical resonance of the austenite/martensite interface and the pinning of the martensitic microstructures by dislocations in Cu74.08 Al23.13 Be2.79

Salje, E. K. H. and Zhang, H. L. and Idrissi, H. and Schryvers, D. and Carpenter, M. A. and Moya, X. and Planes, A. (2009) Mechanical resonance of the austenite/martensite interface and the pinning of the martensitic microstructures by dislocations in Cu74.08 Al23.13 Be2.79. Physical Review B, 80 (13). p. 134114. DOI 10.1103/PhysRevB.80.134114

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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.80.134114

Abstract

A single crystal of Cu74.08Al23.13Be2.79 undergoes a martensitic phase transition at 246 and 232 K under heating and cooling, respectively. The phase fronts between the austenite and martensite regions of the sample are weakly mobile with a power-law resonance under external stress fields. Surprisingly, the martensite phase is elastically much harder than the austenite phase showing that interfaces between various crystallographic variants are strongly pinned and cannot be moved by external stress while the phase boundary between the austenite and martensite regions in the sample remains mobile. This unusual behavior was studied by dynamical mechanical analysis (DMA) and resonant ultrasound spectroscopy. The remnant strain, storage modulus, and internal friction were recorded simultaneously for different applied forces in DMA. With increasing forces, the remnant strain increases monotonously while the internal friction peak height shows a minimum at 300 mN. Transmission electron microscopy shows that the pinning is generated by dislocations which are inherited from the austenite phase.

Item Type: Article
Uncontrolled Keywords: 09AREP; IA60;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B
Volume: 80
Page Range: p. 134114
Identification Number: 10.1103/PhysRevB.80.134114
Depositing User: Sarah Humbert
Date Deposited: 23 Apr 2010 18:03
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1379

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