An Energy Approach to Determine the Martensite Morphology in Nanocrystalline NiTi

Autor(en)

Manuel Petersmann, Wolfgang Pranger, Thomas Waitz, Thomas Antretter

Abstrakt

The characteristic features of martensite in nanocrystalline Ni-50at %Ti are a compromise between interface and strain energies introduced into the material when a grain transforms from austenite to a finely laminated martensite structure. This paper focuses on the evaluation of these energies. Whereas for grain sizes <100nm a single laminate is frequently observed, in larger grains the higher strain energy of this structure leads to hierarchical twinning. As the predominant contribution the strain energy is computed by the finite element method. Interface energies at the twin- as well as the grain-boundaries are subsequently added. Suitable scaling relations yield the evolution of twin spacing and predict that multiple laminates become favorable at a diameter range of 70-90nm.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Montanuniversität Leoben

Journal

Advanced Engineering Materials

Band

19

Anzahl der Seiten

6

ISSN

1438-1656

DOI

https://doi.org/10.1002/adem.201600684

Publikationsdatum

04-2017

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/b23ed749-8185-4e5c-83ed-203062c9ae75