Martensite crystal structure in Ru-based high temperature shape memory alloys
| Autor: | Gilles Wallez, Richard A. Portier, Philippe Vermaut, Anne Denquin, Anna M. Manzoni, Frédéric Prima |
|---|---|
| Přispěvatelé: | DMAS, ONERA, Université Paris Saclay (COmUE) [Châtillon], ONERA-Université Paris Saclay (COmUE), Helmoltz-Zentrum Berlin für Materialien und Energie (GmbH), Institut de Recherche de Chimie Paris (IRCP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ministère de la Culture (MC), Sorbonne Université (SU) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
MARTENSITE
Materials science 02 engineering and technology 01 natural sciences Tetragonal crystal system [SPI]Engineering Sciences [physics] ALLLIAGE 0103 physical sciences [CHIM]Chemical Sciences General Materials Science High-resolution transmission electron microscopy 010302 applied physics [PHYS]Physics [physics] Condensed matter physics Rietveld refinement Mechanical Engineering Phase-contrast imaging ALLOY 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Mechanics of Materials Transmission electron microscopy Others Diffusionless transformation Martensite 0210 nano-technology |
| Zdroj: | Materials Characterization Materials Characterization, Elsevier, 2018, 142, pp.109-114. ⟨10.1016/j.matchar.2018.05.019⟩ |
| ISSN: | 1044-5803 |
| DOI: | 10.1016/j.matchar.2018.05.019⟩ |
| Popis: | International audience; High temperature shape memory alloys RuNb and RuTa were investigated by X-ray diffraction in order to determine the structure of the low temperature β” martensite. Powder X-ray diffraction and Rietveld analysis confirm the monoclinic symmetry and allow a precise determination of the atom positions. The low temperature microstructure is the result of a martensitic transformation from a tetragonal β′ martensite. The analysis of how it is controlled by the space groups of the two phases and by their relative orientation is performed by transmission electron microscopy. A three level twinned microstructure is recognized in the β” phase. The investigation at the smallest scale twins reveals the presence of wavy contrast boundaries which are typical for translation interfaces. High resolution transmission electron microscopy images, accompanied by phase contrast imaging analysis, have been used to determine the translation vectors associated to the interfaces. These displacements are the translations of the tetragonal β′ phase which are lost during the transformation. The combination of X-ray diffraction and transmission electron microscopy investigation allows the suggestion of a global distortion mechanism that explains the atomic displacements in the β” form. |
| Databáze: | OpenAIRE |
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