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Superplasticity of ultrafine-grained Al-Mg-Sc-Zr alloys with different Mg, Sc, Zr content
Russian version
Chuvil'deev V. N. 1, Gryaznov M. Yu. 1, Shotin S. V. 1, Nokhrin A. V. 1, Likhnitskii C. V. 1, Shadrina I. S. 1, Chegurov M. K. 1, Kopylov V. I. 1, Bobrov A. A. 1
1Lobachevsky University of Nizhny Novgorod, Nizhny Novgorod, Russia
Email: chuvildeev@nifti.unn.ru, gryaznov@nifti.unn.ru, shotin@nifti.unn.ru, nokhrin@nifti.unn.ru, likhnitskiy@nifti.unn.ru, yashadrina@nifti.unn.ru, mkchegurov@nifti.unn.ru, kopylov@nifti.unn.ru, bobrov@nifti.unn.ru
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Effect of magnesium concentration (2.5, 4.0, 6.0 wt.%) on the superplasticity of Al-Mg-Sc-Zr aluminum alloys with different Sc/Zr ratios (Sc/Zr = 0.45, 1.0, 2.2) has been studied. The ultrafine-grained (UFG) alloys are obtained by the Equal-Channel Angular Pressing. Superplasticity tests were carried out in the temperature range from 300 oC to 500 oC and in the range of strain rates (ε) from 3.3·10-4 to 3.3·10-1 s-1. The maximum elongation to failure (δmax) is reached at ε=3.3·10-2 s-1. At a test temperature of 500 oC, the maximum elongation to failure is δmax=1970 % (alloy with 2.5 % Mg and Sc/Zr = 2.2) and δmax=1750 % (alloy with 2.5 % Mg and Sc/Zr = 1.0). When fine-grained alloys with a high zirconium content are heated, simultaneous homogeneous precipitation of Al3(Sc,Zr) particles and discontinuos precipitation of fan-shaped submicron Al3Zr particles are observed. An increase in the Sc concentration leads to a decrease in the number of Al3Zr particles formed by the discontinous mechanism and to an increase in the number of Al3Sc nanoparticles. An increase in Mg concentration leads to a decrease in the flow stress and El of fine-grained Al-Mg-Sc-Zr alloys. Studies of the microstructure show that strain-induced grain growth develops with superplasticity. The nature of the elongation to failure dependence on the test temperature is determined by the Sc/Zr ratio - in alloys with Sc/Zr ≥ 1, an increase in temperature leads to an increase in ductility, and in alloys with Sc/Zr = 0.45, to a decrease in ductility. Keywords: Al-Mg alloys, scandium, zirconium, superplasticity, grain growth.
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