Funct. Mater. 2020; 27 (3): 508-512.
Special features of the phase composition and structure of aluminum alloys modified by refractory nanocompositions
1O.Honchar Dnipro National University, 72 Gagarina Ave., 49010 Dnipro, Ukraine
2Kharkiv National Automobile and Highway University, 25 Yaroslava the Wise St., 61002 Kharkiv, Ukraine
3State Higher Educational Institution Prydniprovska State Academy of Civil Engineering and Architecture, 24a Chernishevsky St., 49600 Dnipro, Ukraine
The aluminum alloys of the Al-Zn-Mg-Cu system were studied. As a modifier, a composition based on nanodispersed powders of titanium and boron with fractions of up to 100 nm, obtained with plasma-chemical synthesis, is proposed. The structure, phase composition, and properties of the test samples were studied before and after modification with methods of optical microscopy, X-ray diffraction analysis, and X-ray spectral analysis. In the modified B95 and B96 alloys, grain refinement and structure stabilization were achieved. Determination of the crystal lattice parameters of the alloys showed an increase in the period of lattice of the modified samples by 1.02 %. The microhardness of α-Al, the solid solution, was increased from 1080 to 1500 MPa. The phase composition of B95 and B96 alloys is represented with the intermetallic phases CuAl2, MgZn3, Mg2Zn3, Mg2Si, FeAl3, TiB2, TiAl3, as well as phases of complex composition. The maximum grain refinement and increase in the mechanical properties of the alloys were achieved upon modification of 0.05 % Ti and 0.005 % B, which is explained by the formation of dispersed strengthening intermetallic phases of complex composition in the center of the grains.
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