Size-dependent martensitic transformation path causing atomic-scale twinning of nanocrystalline NiTi shape memory alloys

Autor(en)

Thomas Waitz, Daniel Spisak, Juergen Hafner, Hans-Peter Karnthaler

Abstrakt

Nanocrystalline NiTi alloys were processed by devitrification of an amorphous phase to elucidate the impact of the nanocrystallinity on the thermally induced martensitic phase transformation. Forced by a size-dependent strain energy barrier, atomic-scale twinning leads to a unique path of the martensitic phase transformation. The observed twin boundaries of very low energy facilitate arrays of compound twins on atomic scale to overcome the strain energy barrier of the nanograins thus violating the hitherto well-established theory of martensite formation. ΠEDP Sciences.

Organisation(en)

Computergestützte Materialphysik

Journal

Europhysics Letters

Band

71

Seiten

98-103

Anzahl der Seiten

6

ISSN

0295-5075

DOI

https://doi.org/10.1209/epl/i2005-10061-y

Publikationsdatum

2005

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a57b7d35-7c26-44b0-9c73-197c46b4a75a