Effect of eutectic particles on the grain size control and the superplasticity of aluminium alloys |
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Authors: | A.V. Mikhaylovskaya M.A. RyazantsevaV.K. Portnoy |
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Affiliation: | Department of Physical Metallurgy Non-Ferrous Metals, National University of Science and Technology “MISIS”, 119049 Leninsky Prospect, 4, Russian Federation |
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Abstract: | Aluminium alloys containing eutectic particles of the Al-Ni, Al-Mg-Si, Al-Ni-Ce and Al-Cu-Ce systems are investigated. The particles which control grain growth and stimulate grain nucleation are studied. The Zener-Smith law about dependence between grain size and particle parameters is confirmed and experimental coefficients are found. Experimental coefficients of the Zener-Smith equation obtained in this study depend on the particle size and differ from theoretical coefficients proposed by Zener and Smith. Some alloys with grain size about 3 μm demonstrate very good superplasticity indicators, namely: the strain rate sensitivity index m = 0.5-0.6 and the elongation over 400% at constant strain rate 5 × 10−3 s−1. |
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Keywords: | Aluminium alloys Recrystallization Particle stimulation nucleation Grain refinement Superplastic deformation |
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