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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