Kinetics and morphology of deformation bands at the initial stage of the loss of a stable plastic flow in the 5456 alloy

• Published in: Russian metallurgy Metally Vol. 2010; no. 10; pp. 881 - 888
• Main Authors: Shibkov, A. A., Zolotov, A. E., Mikhlik, D. V., Zheltov, M. A., Shuklinov, A. V., Averkov, V. A., Denisov, A. A.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.10.2010; Springer Nature B.V
• Subjects: Aluminum base alloys; Annealing; Bands; Chemistry and Materials Science; Deformation; Grain boundaries; High speed; Materials Science; Metallic Materials; Microstructure; Morphology; Planes; Structure and Properties of the Deformed State; RUSSIAN Metallurgy; Critical Strain; Deformation Band; Severe Plastic Deformation; Dynamic Strain Aging
• ISSN: 0036-0295; 1555-6255; 1531-8648
• DOI: 10.1134/S003602951010006X

High-speed video filming is used to study the kinetics and morphology of the first deformation bands on the surface of the 5456 alloy having various initial microstructures. The mobility and morphology of the bands is found to change sharply after annealing in the vicinity of the solvus temperature. The dissolution of β(Al 3 Mg 2 ) particles causes a transition from a plane into a branching morphology of the first bands and is accompanied by a sharp (almost an order of magnitude) increase in their mobility. The depinning of grain boundaries via the removal of β-phase particles is assumed to favor grain-boundary sliding, which causes branching of the bands.