Nanocrystallization of NiTi shape memory alloys made amorphous by high-pressure torsion

Autor(en)

Martin Peterlechner, Thomas Waitz, Hans-Peter Karnthaler

Abstrakt

Almost complete amorphization is obtained in NiTi subjected to high-pressure torsion (HPT). Nanocrystallization occurs more than 100 °C lower than in amorphous sputtered and melt spun NiTi. This is caused by medium-range-ordered debris surviving HPT and triggering nanocrystallization. A high nucleation rate and low growth rate result from in situ heating transmission electron microscopy experiments. The kinetics of the heterogeneous nanocrystallization differs significantly from that leading to coarse grains. Therefore, HPT allows the nanostructure to be tailored to enhance shape memory properties. © 2008 Acta Materialia Inc.

Organisation(en)

Physik Nanostrukturierter Materialien

Journal

Scripta Materialia

Band

59

Seiten

566-569

Anzahl der Seiten

4

ISSN

1359-6462

DOI

https://doi.org/10.1016/j.scriptamat.2008.05.004

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2f0d21b4-9905-4a9d-9968-c2d2bda7dae1