Bulk nanostructured shape memory alloys
- Author(s)
- Thomas Waitz
- Abstract
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(s)
- Physics of Nanostructured Materials
- Journal
- Ciencia & Tecnologia dos Materiais
- Volume
- 20
- Pages
- 25-29
- No. of pages
- 5
- ISSN
- 0870-8312
- Publication date
- 2008
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103018 Materials physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/bulk-nanostructured-shape-memory-alloys(57004328-1049-4d98-9e7f-8165c028394b).html