Meso- and microstructural features of steel 12GBA produced by different methods of thermomechanical treatment

Derevyagina, L. S.; Панин, В. Е.; Корзников, А. В.; Гордиенко, А. И.

doi:10.1063/1.4932727

Cited by 3 publications

(2 citation statements)

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“…They are characterized by unstable kinetics of growth with variations of tip speed in the areas of crossing with static bands creating a macroscopically inhomogeneous structure of dislocation pinning forces in the material where the embryo band propagates. It is worth noting, that the interaction of associated bands is important when the contraction is formed and the sample is fractured [8,9]. It can be assumed that in the case of crossing of associated bands multiple cracks occur by the Cottrell mechanism [23], which merge into a main crack under large stresses.…”

Section: Types Of Embryo Bandsmentioning

confidence: 99%

“…The interest in discontinuous deformation and band generation is related not only to the study of non-linear effects in the macrokinetics of plastic materials due to spatial-time self-organizing of large dislocation ensembles, but also to the practical application of metal alloys demonstrating the PLC effect (alloys based on aluminum, copper, titanium, zirconium, medium-alloyed steel, etc., in particular, hightechnology aluminum alloys used in aerospace and transport industries). Macroscopically localized deformation bands compromise surface quality of industrial products, cause local corrosion and directly participate in the mechanism of the main crack initiation and development [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear dynamics of an individual Portevin--Le Chatelier deformation bands

Shibkov

Zolotov

Gasanov

et al. 2022

Physics of the Solid State

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Based on high-speed studies of the dynamics of Portevin--Le Chatelier ambryo bands with a temporal resolution of up to 20 μs and a spatial resolution of up to 10 μm/px, their classification is proposed, which includes four types of bands depending on the nature of interaction with other bands and the sample surface (using the example of a polycrystalline aluminum-magnesium alloy). It has been found that all types of ambryo bands demonstrate nonlinear dynamics with a sharp acceleration of the band tip and the growth rate of its volume at the final stage before reaching the sample surface. A phenomenological model of the nonlinear growth of the ambryo band is proposed, which explains the exponential self-acceleration stage observed experimentally. The sharp absorption of acoustic noise at the stage of accelerated band growth is discussed. Keywords: nonlinear dynamics, Portevin--Le Chatelier effect, deformation ambryo bands, acoustic emission, dislocation mobility, aluminum-magnesium alloy.

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Section: Types Of Embryo Bandsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%