Abstract
The characteristic features of martensite in nanocrystalline Ni-50 at %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 <100 nm 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 70–90 nm.
| Original language | English |
|---|---|
| Article number | 1600684 |
| Number of pages | 6 |
| Journal | Advanced Engineering Materials |
| Volume | 19 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 2017 |
Funding
Financial support by the Austrian Federal Government (in particular from Bundesministerium fur Verkehr, Innovation und Technologie and Bundesministerium fur Wissenschaft, Forschung und Wirtschaft) represented by Osterreichische Forschungsforderungsgesellschaft mbH and the Styrian and the Tyrolean Provincial Government, represented by Steirische Wirtschaftsforderungsgesellschaft mbH and Standortagentur Tirol, within the framework of the COMET Funding Programme is gratefully acknowledged.
Austrian Fields of Science 2012
- 103018 Materials physics
Keywords
- SHAPE-MEMORY ALLOYS
- SEVERE PLASTIC-DEFORMATION
- TRANSFORMATION
- ACCOMMODATION
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