title: Nonlocal superelastic model of size-dependent hardening and dissipation in single crystal Cu-Al-Ni shape memory alloys.
abstract: We propose a nonlocal continuum model to describe the size-dependent superelastic effect observed in recent experiments of single crystal Cu-Al-Ni shape memory alloys. The model introduces two length scales, one in the free energy and one in the dissipation, which account for the size-dependent hardening and dissipation in the loading and unloading response of micro- and nanopillars subject to compression tests. The information provided by the model suggests that the size dependence observed in the dissipation is likely to be associated with a nonuniform evolution of the distribution of the austenitic and martensitic phases during the loading cycle.
authors.affiliation: Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Lei
authors.initials: L
authors.lastname: Qiao
authors.forename: Julian J
authors.initials: JJ
authors.lastname: Rimoli
authors.forename: Ying
authors.initials: Y
authors.lastname: Chen
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Schuh
authors.forename: Raul
authors.initials: R
authors.lastname: Radovitzky