Surface roughness-controlled superelastic hysteresis in shape memory microwires

TitleSurface roughness-controlled superelastic hysteresis in shape memory microwires
Publication TypeJournal Article
Year of Publication2014
AuthorsUeland, SM, Schuh, CA
JournalScripta Materialia
Volume82
Pagination1 - 4
Date Published2014/07/01/
Abstract

Superelasticity in Cu-Zn-Al shape memory alloy microwires is studied as a function of surface roughness. Wires with a rough surface finish dissipate more than twice as much energy per unit volume during a superelastic cycle than do electropolished wires with smooth surfaces. We attribute the increased damping in wires with large surface roughness to the increased density of surface obstacles where frictional energy is dissipated as heat during martensitic phase transformation. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.