Mechanisms of Strengthening Aluminum Foils Consolidated by High-Pressure Torsion Technique

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Abstract

The contributions of grain boundary and dislocation mechanisms to the experimentally established strengthening of pure Al samples obtained by consolidation of thin foils by high pressure torsion technique were estimated within the framework of well-known theoretical models using structural parameters (sizes of coherently scattering domains and lattice microstrains) determined by X-ray diffraction. Good agreement between the calculated values and the hardness of deformed and aged samples was found, and possible reasons for their differences for the initial foils were discussed. The influence of deformation and aging on the relative contributions of the analyzed mechanisms to the strengthening of samples consolidated from both Al foils and the rapidly quenched Al95.8Mn3.8Fe0.4 ribbons was determined. The structural features of samples processed by high pressure torsion and the relationship between structural parameters and mechanical properties were discussed.

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About the authors

E. A. Sviridova

A.A. Galkin Donetsk Institute for Physics and Engineering; Donbas National Academy of Civil Engineering and Architecture

Author for correspondence.
Email: ksvir@list.ru
Russian Federation, Donetsk; Makеyеvka

S. V. Vasiliev

A.A. Galkin Donetsk Institute for Physics and Engineering; Donbas National Academy of Civil Engineering and Architecture

Email: ksvir@list.ru
Russian Federation, Donetsk; Makеyеvka

A. I. Limanovsky

A.A. Galkin Donetsk Institute for Physics and Engineering

Email: ksvir@list.ru
Russian Federation, Donetsk

V. N. Varyukhin

A.A. Galkin Donetsk Institute for Physics and Engineering

Email: ksvir@list.ru
Russian Federation, Donetsk

V. I. Tkach

A.A. Galkin Donetsk Institute for Physics and Engineering

Email: ksvir@list.ru
Russian Federation, Donetsk

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Supplementary files

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2. Fig. 1. Diffractograms of Al foil in the initial state (1) and after deformation – rotation by 1 vol. under pressure of 2 GPa (2)

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3. Fig. 2. The effect of the consolidation mode on the hardness of Al discs: ▲ - 2 GPa, 1 vol.; ▼ – 4 GPa, 1 vol.; ■ - 4 GPa, 4 vol. The dashed line shows the hardness of the original foil

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4. Fig. 3. The effect of natural aging on the hardness of the Al disk consolidated in the 4 GPa, 4 vol. mode: ■ – after deformation; ● – after a year of exposure

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