Dynamic Recrystallization Mechanisms of Nickel Niobium Alloys during Hot Working
| Autor: | David Piot, M. L. Fares, Nadjoua Matougui |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy Niobium chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Nickel Hot working chemistry Mechanics of Materials 0103 physical sciences Dynamic recrystallization General Materials Science 0210 nano-technology Electron backscatter diffraction |
| Zdroj: | Materials Science Forum. 1016:869-874 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.1016.869 |
| Popis: | This present work examines the influence of niobium in solid solution on the microstructural evolution of pure nickel at various deformation conditions. On this purpose, high-purity nickel and six model nickel-niobium alloys (Ni–0.01, 0.1, 1, 2, 5 and 10 wt. % Nb) were subjected to hot torsion test to large strains within the temperature range from 800 to 1000 °C at strain rates of 0.03, 0.1 and 0.3 s–1. Microstructural analyses were carried out using both optical and scanning electron microscopy-based electron back-scattered diffraction technique. The overall results showed the key role played by the Nb amount when coupled with various DRX mechanisms involved, i.e. DDRX, CDRX, and GDRX with respect to the prescribed deformation conditions, in reducing grain size and retarding DRX kinetics from which the microstructures of the examined materials such as Ni 2 and 10 wt. % Nb were seen evolving in different ways. In all these deformed materials, a transition from discontinuous dynamic recrystallization to continuous dynamic recrystallization was observed at low temperature and high strain rate whereas only discontinuous dynamic recrystallization occurred at high temperature. |
| Databáze: | OpenAIRE |
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