PRODUCING HIGH-STRENGTH DEFORMABLE ALUMINUM ALLOYS OF TYPE AMg10

Traditional grades of aluminum alloys do not always meet the requirements of modern aerospace engineering. Al–Si foundry alloys possess insufficient mechanical strength characteristics and low plasticity due to their structural features (coarse brittle silicon inclusions and intermetallic phases). Therefore they cannot be exposed to pressure treatment. A technique for producing high-strength aluminum alloys, which consists in obtaining ring blanks by means of direct crystallization of melts with application of non-stationary centrifugal force fields and simultaneous introduction of modifiers, is proposed. The microstructure and plasticity of resulting tube-shaped blanks allow them to be exposed to sheeting for subsequent production of pipe workpieces with mechanical strength commensurate with mechanical strength of structural steel. The technique involves hydrothermal synthesis of nanostructured particles of aluminum oxide, which are overheated above the melt temperature prior to introduction into the molten aluminum alloy. This procedure enhances the processes of intercrystalline hardening with minimal fluctuations of internal stresses within the hardened material. The materials have tensile strength of up to 380 MPa (before modification by nanodispersed aluminum oxide it was 210 MPa). The microstructure has showed changes in the acicular dendrite component, which tends to become more dispersed and equiaxial. Eventually this leads to an increase in the mechanical strength by a factor of 1.25–1.32. 

1. Xu Wang, Guoqin Chen, Bing Li, Lianmei Wu, Daming Jiang. Effects of Sc, Zr and Ti on the microstructure and properties of Al alloys with high Mg content. Rare Metals, 2010, vol. 29, Iss. 1, pp. 66–71. Doi: 10.1007/s12598-010-0012-8

2. Grechnikov Ph. V., Popov I. P., Erisov Ya. A. Production of aluminum AMg10 alloy with ultra-fine-grained structure rolling by ARB method. Izvestiya Samarskogo nauchnogo tsentra Rossiiskoi akademii nauk = Izvestia of Samara Scientific Center of the Russian Academy of Sciences, 2013, vol. 15, no. 4, pp. 165–169 (in Russian).

3. Savelieva O. G. Development of the modes for thermal and deformation treatment of sheets from the alloys of Al–Mg and Al–Cu–Mg systems for the structure formation, residual stresses and technological properties, providing formability improvement. Samara, 2013. 20 p. (in Russian).

4. Ostapchuk V. V. Investigation of the structure and properties of the Al–Mg–Si system alloys after explosive deformation. Voprosy proektirovaniya i proizvodstva konstruktsii letatel’nykh apparatov: sb. nauch. tr. [Design and Production Issues of Aircraft Constructions: collection of scientific papers]. Khar’kov, Khar’kovskii aviatsionnyi institute, 2012. Issue 4. Pp. 149–154 (in Russian).

5. Kulіnich A. A. Carbon and titanium effect on the structure, mechanical and technological properties of alloys and AMg10. Vіsnik SevNTU. Serіya: Mekhanіka, energetika, ekologіya: zbіrnik naukovikh prats’ = Journal of the Sevastopol National Technical University. Series: Mechanics, Power Engineering, Ecology. Sevastopol, 2012. Issue 133. Pp. 179–183 (in Russian).