| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Frenzel, J.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2022The role of electrons during the martensitic phase transformation in NiTi-based shape memory alloyscitations
- 2021Effect of off-stoichiometric compositions on microstructures and phase transformation behavior in Ni-Cu-Pd-Ti-Zr-Hf high entropy shape memory alloys
- 2019Impact of Heating–Cooling Rates on the Functional Properties of Ti–20Ta–5Al High-Temperature Shape Memory Alloyscitations
- 2018Development of Single-Crystal Ni-Base Superalloys Based on Multi-criteria Numerical Optimization and Efficient Use of Refractory Elementscitations
- 2017Identification of a ternary mu-phase in the Co-Ti-W system - An advanced correlative thin-film and bulk combinatorial materials investigationcitations
- 2017Identification of a ternary μ-phase in the Co-Ti-W system – An advanced correlative thin-film and bulk combinatorial materials investigationcitations
- 2017Microstructural evolution and functional fatigue of a Ti-25Ta high-temperature shape memory alloycitations
- 2016Nanostructured Ti-Ta thin films synthesized by combinatorial glancing angle sputter depositioncitations
- 2015The effect of cast microstructure and crystallography on rafting, dislocation plasticity and creep anisotropy of single crystal Ni-base superalloyscitations
- 2015Functional and structural fatigue of titanium tantalum high temperature shape memory alloys (HT SMAs)citations
- 2015Cyclic degradation of titanium-tantalum high-temperature shape memory alloyscitations
- 2014On the functional degradation of binary titanium-tantalum high-temperature shape memory alloyscitations
- 2013High-temperature and low-stress creep anisotropy of single-crystal superalloyscitations
- 2010Influence of Ni on martensitic phase transformations in NiTicitations
- 2009R-phase formation in Ti(39)Ni(45)Cu(16) shape memory thin films and bulk alloys discovered by combinatorial methodscitations
- 2009Surface of Ti-Ni alloys after their preparationcitations
Places of action
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article
Microstructural evolution and functional fatigue of a Ti-25Ta high-temperature shape memory alloy
Abstract
Titanium–tantalum based alloys can demonstrate a martensitic transformation well above 100 °C, which makes them attractive for shape memory applications at elevated temperatures. In addition, they provide for good workability and contain only reasonably priced constituents. The current study presents results from functional fatigue experiments on a binary Ti–25Ta high-temperature shape memory alloy. This material shows a martensitic transformation at about 350 °C along with a transformation strain of 2 pct at a bias stress of 100 MPa. The success of most of the envisaged applications will, however, hinge on the microstructural stability under thermomechanical loading. Thus, light and electron optical microscopy as well X-ray diffraction were used to uncover the mechanisms that dominate functional degradation in different temperature regimes. It is demonstrated the maximum test temperature is the key parameter that governs functional degradation in the thermomechanical fatigue tests. Specifically, ω-phase formation and local decomposition in Ti-rich and Ta-rich areas dominate when T max does not exceed ≈430 °C. As T max is increased, the detrimental phases start to dissolve and functional fatigue can be suppressed. However, when T max reaches ≈620 °C, structural fatigue sets in, and fatigue life is again deteriorated by oxygen-induced crack formation. Copyright © Materials Research Society 2017