Mechanical Stabilization of Martensite in Cu–Ni–Al Single Crystal and Unconventional Way to Detect It
| Autor: | Oleg Heczko, M. Vronka, Petr Veřtát, Vít Kopecký, P. Krátká, Yanling Ge, Michal Rameš, K. Onderková |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Austenite Materials science 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences law.invention Optical microscope Mechanics of Materials law Transmission electron microscopy Diffusionless transformation Phase (matter) Martensite 0103 physical sciences General Materials Science Composite material 0210 nano-technology Single crystal |
| Zdroj: | Shape Memory and Superelasticity. 4:77-84 |
| ISSN: | 2199-3858 2199-384X |
| DOI: | 10.1007/s40830-018-0164-1 |
| Popis: | The microstructures and transformation behaviour of self-accommodated and mechanically stabilized martensite of Cu69.4Ni3.4Al27.2 (at.%) single crystal were investigated by optical microscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD) and magnetometry. XRD and TEM analyses showed the presence of both 2H and 18R phases in self-accommodated martensite. The mechanical compression of martensite (≈ 100 MPa) increased markedly the transformation temperature to austenite, i.e. resulting in significant mechanical stabilization of martensite. The 18R phase disappeared after the compression. This reveals the important role of 18R phase in transformation behaviour of Cu–Ni–Al alloy. Furthermore, we demonstrate that thermo-magnetic measurement is suitable method to analyse the martensitic transformation even for diamagnetic material. |
| Databáze: | OpenAIRE |
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