Bulk nanostructured shape memory alloys

Autor(en)

Thomas Waitz

Abstrakt

This paper starts with a brief introduction to bulk nanostructured materials. Bulk nanocrystalline materials processed by methods of severe plastic deformation show mechanical properties and phase structures that can differ significantly from those of their coarse grained counterparts. In the case of NiTi shape memory alloys, a nanocrystalline structure is obtained via the devitrification of an intermediate amorphous phase induced by high pressure torsion. Grain sizes in the range of 5 to 350 nm are achieved that are free of strains and of crystal defects. The small grain size significantly impacts the martensitic phase transformation that causes unique thermomechanical properties such as the shape memory effect and superelasticity. Experimental results on the enhanced mechanical properties of nanocrystalline and ultrafine grained NiTi shape memory alloys are shortly reviewed.

Organisation(en)

Physik Nanostrukturierter Materialien

Journal

Ciencia & Tecnologia dos Materiais

Band

20

Seiten

25-29

Anzahl der Seiten

5

ISSN

0870-8312

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/57004328-1049-4d98-9e7f-8165c028394b