Structural changes during annealing of submicro- and nanocrystalline aluminum alloys |
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Authors: | N K Tsenev V N Perevezentsev M Yu Shcherban’ and A N Tsenev |
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Institution: | 1.ZAO Konstruktsiya,Moscow,Russia;2.Blagonravov Institute of Engineering Science,Nizhni Novgorod Branch, Russian Academy of Sciences,Nizhni Novgorod,Russia;3.Nizhni Novgorod State University,Nizhni Novgorod,Russia |
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Abstract: | The annealing-induced evolution of the structure and microhardness of submicro-and nanocrystalline Al—3% Mg and Al 1570 alloys
produced by torsional severe plastic deformation are studied. Annealing of the Al-3% Mg alloy at 373–423 K and annealing of
the Al 1570 alloy at 373–473 K are shown to result in the relaxation of internal stresses and subsequent normal grain growth.
As the annealing temperature increases, the microhardness decreases. At higher temperatures (473 K for the Al—3% Mg alloy
and 573 K for the Al 1570 alloy), anomalous grain growth takes place. This growth is accompanied by the appearance of numerous
grains with a high dislocation density, a high concentration of impurity atoms in grain boundaries, and an increase in the
microhardness. These effects are explained. |
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