Formation of a shock deformation induced ω phase in Zr 20 Nb alloy
| Autor: | Gautam Kumar Dey, G. Jyoti, Srikumar Banerjee, Keshaw D Joshi, Raghvendra Tewari, Satish C. Gupta, S. K. Sikka |
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| Rok vydání: | 2004 |
| Předmět: |
Materials science
Polymers and Plastics Condensed matter physics Zirconium alloy Alloy Metals and Alloys Thermal treatment engineering.material Microstructure Electronic Optical and Magnetic Materials Crystallography Transmission electron microscopy Martensite Ceramics and Composites engineering Selected area diffraction Deformation (engineering) |
| Zdroj: | Acta Materialia. 52:5243-5254 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2004.07.008 |
| Popis: | The formation of a plate shaped ω phase in Zr–Nb alloy after shock deformation has been studied with a view to ascertaining the nature of this transformation. The orientation relationship between the β and the ω lattices was {1 1 1}β//(0 0 0 1)ω and 〈 1 1 ¯ 0 〉 β / / 〈 1 1 2 ¯ 0 〉 ω which is identical to that seen in case of ω phase forming in this alloy on thermal treatment. The experimentally determined habit plane of the plate shaped ω phase has been compared with that predicted from the phenomenological theory of martensite formation. A mechanism of transformation involving shear on the 〈1 1 2〉 planes has been considered. The importance of mechanical instability of the β phase in bringing about this transformation has been investigated. The mechanism of initiation of ω transformation has been ascertained by high resolution electron microscopy (HREM) of the β lattice and compared with that happening during ω formation in the same alloy by thermal treatment. |
| Databáze: | OpenAIRE |
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