Interference pattern dependence on the deformation degree of the AD0 alloy sample surface microstructure in polarized light

DOI: 10.34759/vst-2022-3-253-259

Аuthors

Voronin S. V.^*, Chaplygin K. K.^**

Samara National Research University named after Academician S.P. Korolev, 34, Moskovskoye shosse, Samara, 443086, Russia

*e-mail: voronin@ssau.ru
**e-mail: chapkostya96@mail.ru

Abstract

Based on the previously developed technique for determining the crystallographic orientation in polarized light, the authors propose evaluating the change in the interference pattern after the sample loading. For this purpose, a sample with decreasing cross-sectional area along the tension axis was fabricated, for loading its parts on various degree of deformation. The sample was being stretched until the yield stress was reached in the smallest section of the sample. After stretching, the local degrees of deformation of the sample sections were calculated. Three main sections with deformations of 1.5%, 5.5% and 17.5% were identified.

Metallographic section, subjected to electrolytic etching for the surface observing by the polarizing microscopy, was fabricated from each section. As was established earlier, three basic colors, namely blue, brown and yellow, which volume fractions changed depending of the deformation degree, were being observed on the sample.

The dependence of microstructure interference pattern on the degree of deformation was determined in the course of the studies for the AD0 alloy microstructure. It has been established that with an increase in the degree of deformation, the volume fraction of blue and yellow grains increases. The volume fraction of brown grains decreases, which can be explained by the fact that these grains correspond to the [110] crystallographic direction, which is more amenable to plastic deformation in the FCC lattice.

It should be noted that the volume fraction of blue and yellow grains increases by 25% at a deformation of 5.5%, while that of brown grains decreases by 44%. At the degree of deformation of 17.5%, the volume fraction of brown grains becomes smaller by another 17% compared to the 5.5%, while the volume fraction of blue and yellow grains slightly increases by 4 and 6%, respectively.

The authors propose employing the obtained dependencies to control the anisotropy and degree of deformation in the production of aluminum parts and products, as well as the express method for controlling the crystallographic orientation.

Keywords:

anisotropy of mechanical properties, color film etching, polarizing microscopy, crystallographic orientation determining

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