Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 659, Issue -, Pages 225-233Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.02.061
Keywords
Aluminium alloys; High strain rate superplasticity; Grain structure; Dislocation structure; Particle-stimulated nucleation
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Funding
- Ministry of Education and Science of the Russian Federation [11.1855.2014/K]
- Increase Competitiveness Program of MISIS
- Basic Research Program at the National Research University of Higher School of Economics (HSE)
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Superplastic deformation behaviour of two aluminium-based AA7XXX type alloys with Sc and Zr additives distinguished by the presence and absence of coarse eutectic Al9FeNi particles are compared. An alloy with Al9FeNi particles exhibits high strain rate superplasticity at constant strain rate range of 5 x 10(-3)-8 x 10(-2) s(-1) with elongation of 915% due to extensive dynamic recrystallisation. Effective activation energy of superplastic deformation, surface relief of deformed samples, and grain structure evolution are analysed. Particle-depleted zones are found in the alloy with Al9FeNi particles at strains higher than 1.25. (C) 2016 Elsevier B.V. All rights reserved.
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