Title
Mechanical resonance of the austenite/martensite interface and the pinning of the martensitic microstructures by dislocations in <tex>$Cu_{74.08}Al_{23.13}Be_{2.79}$</tex> Mechanical resonance of the austenite/martensite interface and the pinning of the martensitic microstructures by dislocations in <tex>$Cu_{74.08}Al_{23.13}Be_{2.79}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review: B: condensed matter and materials physics
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Volume/pages
80(2009) :13 , p. 134114,1-1134114,8
ISSN
1098-0121
1550-235X
ISI
000271351300033
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/5b947f/6be044b9.pdf
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