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Microstructures of Constrained Shape Memory Alloy Nanowires Under Thermal Effects

[+] Author Affiliations
Rakesh P. Dhote, Jean W. Zu

University of Toronto, Toronto, ON, Canada

Roderick V. N. Melnik

Wilfrid Laurier University, Waterloo, ON, Canada; BCAM, Derio, Spain

Linxiang Wang

Hangzhou Dianzi University, Hangzhou, China

Paper No. SMASIS2010-3814, pp. 597-603; 7 pages
doi:10.1115/SMASIS2010-3814
From:
  • ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1
  • Philadelphia, Pennsylvania, USA, September 28–October 1, 2010
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-4415-1 | eISBN: 978-0-7918-3886-0
  • Copyright © 2010 by ASME

abstract

In this paper, martensitic transformations in constrained Fe-Pd nanowires are studied using a mesoscopic model analyzed in detail numerically in our earlier papers. The dynamics of square-to-rectangular transformation is modeled by using the modified Ginzburg-Landau theory. The simulations are performed accounting for the thermal effects using the coupled equations of non-linear thermoelasticity. Up to date, these effects have typically been neglected in modeling microstructures at the scales of interest considered here. Nanowires of length 2000 nm and widths ranging from 200 nm to 50 nm are simulated to study the effect of size on the microstructure evolution. There exists a critical width below which the size effect is prominent. We present a series of numerical results demonstrating this phenomenon. We also have carried out the study of variations in values of bulk, shear, and Landau constants to understand the difference in evolved microstructure in the coupled and uncoupled physics.

Copyright © 2010 by ASME

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