DOI 10.17586/0021-3454-2020-63-5-476-482
UDC 620. 3
Optimization of the Structure and Properties of the Al-Cu-Mg System Aluminum Alloy
Peter the Great St. Petersburg Polytechnic University, Institute of Machinery, Materales and Transport;
E. V. Bobruk
PhD, Associate Professor; Ufa State Aviation Technical University;
M. A. Skotnikova
St. Petersburg Polytechnic University, Higher School of Mechanical Engineering; Institute of Mechanical Engineering, Materials and Transport;
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Abstract. Results of experimental investigation of aluminum alloy D16 of the Al-Cu-Mg system are presented. Using optical metallography, scanning electron microscopy, and electrical conductivity tests, the tendency of the alloy to natural and artificial aging after quenching and intense plastic torsion deformation under 6 GPa pressure at room temperature is studied. Dependences of the alloy microhardness and electrical con-ductivity on holding time are revealed. It is shown that heat treatment (quenching + intense plastic torsion de-formation + artificial aging) leads to a 2.3-fold increase in the hardness of the D16 alloy as compared to the standard HT (T4), while maintaining the level of electrical conductivity.
Keywords: nanocrystalline materials, ultrafine-grained materials, intensive plastic deformation, mechanical properties, heat treatment, fractographic analysis
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