Formation of Deformation Bands during Impact Indentation of an Al–6Mg Alloy

—The nucleation and growth of macrolocalized deformation bands initiated by impact indentation in deformed aluminum-magnesium alloy samples have been investigated by acoustic emission and high-speed video recording with a time resolution to 50 μs. The indenter impact has been found to trigger the de...

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Bibliographic Details
Published in:Physics of metals and metallography 2023-04, Vol.124 (4), p.402-408
Main Authors: Shibkov, A. A., Zolotov, A. E., Denisov, A. A., Gasanov, M. F.
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic emission testing
Aluminum base alloys
Chemistry and Materials Science
Deformation effects
Emission analysis
Indentation
Magnesium
Magnesium alloys
Materials Science
Metallic Materials
Nucleation
Plastic deformation
Portevin-le Chatelier effect
Serrated yielding
Strength and Plasticity
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Summary:—The nucleation and growth of macrolocalized deformation bands initiated by impact indentation in deformed aluminum-magnesium alloy samples have been investigated by acoustic emission and high-speed video recording with a time resolution to 50 μs. The indenter impact has been found to trigger the development of a ~1–3% amplitude plastic deformation macroscopic jump due to the nucleation and propagation of about ten deformation bands on an alloy surface, thus demonstrating the Portevin–Le Chatelier effect. Macrolocalized deformation bands are shown to be a dangerous type of erosion damage that can cause the sudden fracture of an alloy.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X23600197