Martensitic phase transformations of nanocrystalline NiTi shape memory alloys processed by repeated cold rolling
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M. Peterlechner
, T. Waitz , C. Gammer and T. Antretter
Abstract
The impact of grain size on the martensitic phase transformations of bulk nanocrystalline NiTi shape memory alloys processed by repeated cold rolling was systematically studied by differential scanning calorimetry and transmission electron microscopy. With decreasing grain size, the formation of the martensite is strongly suppressed and its thermal stability decreases. The effect of grain size on the intermediate R-phase is much smaller than that observed in the case of the martensite. Reversible and irreversible contributions to the Gibbs free energy of the martensite were obtained that are larger than those arising from the formation of martensite in coarse grains. Considering the dependence of the energy barrier on the transformation eigenstrain and the grain size, the experimental results were modelled within the general thermodynamic framework of the martensitic phase transformation.
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© 2011, Carl Hanser Verlag, München
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Articles in the same Issue
- Original Contributions
- Microstructure and adhesion of as-deposited and annealed Cu/Ti films on polyimide
- On the origin of inhomogeneous stress and strain distributions in single-crystalline metallic nanoparticles
- Contents
- Contents
- Editorial
- Editorial June 2011
- IJMR's most downloaded papers
- Original Contributions
- An excursion into the design space of biomimetic architectured biphasic actuators
- Strategies for fracture toughness, strength and reliability optimisation of ceramic-ceramic laminates
- Fracture statistics of brittle materials at micro- and nano-scales
- Martensitic phase transformations of nanocrystalline NiTi shape memory alloys processed by repeated cold rolling
- Variational modeling of shape memory alloys – an overview
- Phase-field approach to martensitic phase transformations: Effect of martensite–martensite interface energy
- Modelling of diffusive and massive phase transformations in binary systems – thick interface parametric model
- On the strength of grain and phase boundaries in ferritic-martensitic dual-phase steels
- A micro-level strain analysis of a high-strength dual-phase steel
- Thermodynamic description of niobium-rich γ-TiAl alloys
- Phase transition and ordering behavior of ternary Ti–Al–Mo alloys using in-situ neutron diffraction
- Microstructure evolution and mechanical properties of an intermetallic Ti-43.5Al-4Nb-1Mo-0.1B alloy after ageing below the eutectoid temperature
- Investigation of Cu precipitation in bcc-Fe – Comparison of numerical analysis with experiment
- Modeling interfacial effects on the thermal conduction behavior of short fiber reinforced composites
- Electronic origin of structure and mechanical properties in Y and Nb alloyed Ti–Al–N thin films
- DGM News
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