Nanoquasicrystalline Al-Fe-Cr-based alloys. Part II. Mechanical properties
| Autor: | A. Garcia Escorial, Brian Cantor, M. Galano, I.C. Stone, Fernando Audebert |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Polymers and Plastics Metallurgy Alloy Metals and Alloys Activation energy engineering.material Strain rate Electronic Optical and Magnetic Materials Deformation mechanism Ultimate tensile strength Ceramics and Composites engineering Grain boundary Melt spinning Deformation (engineering) |
| Popis: | Nanoquasicrystalline Al-based alloys show considerable promise for elevated temperature applications compared with commercial Al-based alloys. In particular, a group of Al-Fe-Cr-based alloys-containing Ti, V, Nb or Ta have outstanding thermal stability. In the present work, the elevated temperature mechanical properties of these nanoquasicrystalline alloys were studied by tensile tests at a constant strain rate. Tests were designed in order to compare the mechanical behaviour at different test temperatures. Fractographic analysis was also carried out. The apparent activation energy for plastic deformation was found to be close to that for lattice self-diffusion for pure Al in the Al-Fe-Cr ternary alloy and in the Ti-containing alloy, and for grain boundaries diffusion for pure Al in the V-containing alloy, whereas the activation energy of the alloy with Ta additions was three times higher. All of the alloys showed similar sensitivity of plastic deformation to the strain rate in the range of 10-3-5 × 10-6 s-1 at 350 °C. The apparent true stress exponent was napp ∼ 7, which can be associated with a deformation process controlled by dislocation mechanisms. © 2009 Acta Materialia Inc. |
| Databáze: | OpenAIRE |
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