Superplasticity of Alloy Al – 11% Zn – 3% Mg – 0.8% Cu – 0.3% Zr with Fe and Ni Additives
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The effect of Fe and Ni on the parameters of superelasticity of alloy Al – 11% Zn – 3%Mg – 0.8% Cu – 0.3% Zr is studied. It is shown that addition of 1% Ni and 0.6% Fe raises the volume fraction of second-phase particles from 6 to 14%, and this provides a more dispersed and partially recrystallized structure. As a result, the flow stress during superplastic deformation decreases by a factor of 1.5 – 2.0 and the elongation increases from 360 – 420% to 500 – 660% at deformation rates ranging within 2 × 10−3 – 1 × 10−2 sec−1.
Key wordsaluminum alloys superplastic deformation heat and deformation treatment recrystallization
The work has been performed with financial support of the National University of Science and Technology “MISiS,” the Ministry of Education and Science of the Russian Federation, the Federal Target Program “Scientific and Scientific-Pedagogical Manpower of the Innovative Russia” for 2009 – 2013 (Agreement No. 18.104.22.1684), and a Grant of the President of the Russian Federation (MK-232.2013.8).
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