Comparative Analysis of Nanostructure and Phase omposition of Amorphous and Polycrystalline Al85Ni7Fe4La4 Alloys after Complex Impacts of Deformation and Flash Lamp Annealing

Abstract

The structure and phase composition of an aluminum-based alloy Al-Ni-Fe-La with two types of initial structure (polycrystalline and amorphous) after complex action of plastic deformation and pulsed photonic processing were studied by metallography, X-ray diffraction analysis, and differential scanning calorimetry. It was found that in alloys of both types, after intensive plastic deformation (IPD), a multiphase nanostructural state is formed. In a polycrystalline alloy, IPD develops the dispersion of all phase components present in the alloy after quenching. In an amorphous alloy, IPD causes the development of partial multiphase crystallization, which is not completed in the entire range of the studied deformation parameters. The retained amorphous phase and high dispersion of all phase components in the amorphous alloy provide increased values of hardness in comparison with the hardness of a polycrystalline alloy under all investigated deformation modes. It is shown that preliminary deformation increases the stability of the amorphous alloy to temperature. Complex processing, including IPD and FLA, leads to additional hardening of alloys. The optimal mode of complex action on the structure, which ensures their maximum strength characteristics, has been determined. The hardness of the alloy with the initial amorphous structure remains higher in the entire investigated range of complex processing parameters.