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Актуальные проблемы в машиностроении. 2016. №3 Материаловедение
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13. Alfyorova E.A., Lychagin D.V., Popov A.A. Patterns of folded structure formation in the
maximum bending zone of [111] FCC single crystals // IOP Conference Series: Materials Science
and Engineering. – 2015. – Vol. 91. – P. 012024.
THE FOLDING STRUCTURE IN [ 111]-NICKEL SINGLE CRYSTAL
Alfyorova E.A.1, Ph.D. (Physics and Mathematics), Associate Professor, e-mail:
Lychagin D.V. 1,2, (Physics and Mathematics), Professor, e-mail:
Soprunov D.V. 1 Graduate students, e-mail:
1 National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, 634050, Russian
Federation
2 National Research Tomsk State University, 36 Lenin Avenue, Tomsk, 634050, Russian Federation
Abstract
This article examines the characteristics of folding in [ 111]-nickel single crystal. The aim of the
study is establishment of the regularities of folding and its role in plastic deformation. We explore
how the folding depends on the crystallography, geometry of crystal and scheme of the state of
stress. We applied a set of modern methods. There is optical and confocal microscopy for determine
the morphology and the parameters of the relief.
We found that the most intensive folding goes to places of greatest curvature of the crystal (the
area of concave and convex). The morphology of folds in various zones is different. Octahedral slip
is an integral part of the formation of folds with the initial deformation.
We analyzed the morphological parameters of the folded structures in different zones and
suppose that more dense folds can relax higher stresses.
The article presents experimental data on the magnitude of inhomogeneous deformation in the
folds. They confirm that the folded structures lower the heterogeneity of deformation.
Therefore, the folds are additional way organization deformation in the crystal along with
octahedral slip.
The experimental results presented in this paper can be considered as model in the study of metal
forming processes.
Keywords
Fcc-single crystal, folding, heterogeneity of plastic deformation, organization of deformation, shift
Funding
The reported study was funded by RFBR, according to the research project No. 16-32-60007
mol_а_dk