Shape memory metamaterials with tunable thermo-mechanical response via hetero-epitaxial integration: A molecular dynamics study

Karthik Guda Vishnu, Birck Nanotechnology Center, Purdue University
Alejandro Strachan, Birck Nanotechnology Center, Purdue University

Date of this Version



J. Appl. Phys. 113, 104502 (2013)


Copyright (2013) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 113, 104502 (2013) and may be found at The following article has been submitted to/accepted by Journal of Applied Physics. Copyright (2013) Bjorn Vermeersch, Je-Hyeong Bahk, James Christofferson and Ali Shakouri. This article is distributed under a Creative Commons Attribution 3.0 Unported License.


We show that nanoscale epitaxial superlattices (SLs) can be used to engineer the energy landscape that governs the martensitic transformation in shape memory alloys and tune their thermo-mechanical response. We demonstrate the approach using large-scale molecular dynamics simulations of a SL material consisting of alternate layers of a shape memory Ni-rich NiAl alloy and NiAl B2 alloy. The non-martensitic NiAl alloy was chosen to reduce the energy barrier that separates the martensite and austenite phases of the SL and its incorporation leads to a reduction in the thermal hysteresis of the transition. This is a desirable feature in applications involving actuation and our approach represents a generally applicable and powerful avenue to engineer desired behavior in mechanically active materials. (C) 2013 American Institute of Physics. []


Nanoscience and Nanotechnology