Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.109: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

The Limits of Nanomechanical Applications of Shape Memory Alloys: An Optical Approach — •Andreas Kolloch, Johannes Boneberg, and Paul Leiderer — Universität Konstanz

Shape Memory Alloys (SMA), with their high strain and stress values for small temperature changes and their excellent durability against environmental influences, may prove to be ideal candidates for the driving force of nanomechanical devices. In spite of this promising potential, however, very little is known about the properties of SMA materials, and in particular thin films, on the nanoscale.

Our work concentrates on the classic SMA, Nitinol, an intermetallic compound consisting of nickel and titanium. While it is completely reversible, the martensite-austenite transition of this material is accompanied by large strain and stress changes of up to 6-8% and 600 MPa, respectively.

The project aims at employing an ultrafast thermo-optical approach to investigating whether there is a lower thickness limit of the martensitic phase transition in NiTi SMAs and what the transition speed for the phase change of these materials is.