Abstract
The aim of this work is to solve the methodological issues of the experimental study of the nucleation and propagation of deformation bands due to the Portevin-Le Chatelier effect under conditions of complex loading. It is of interest to determine the boundaries of unstable plastic deformation of the AMg6 alloy under complex loading conditions. A technique for controlling the loading process with a given rate of deformation intensity of materials has been worked out. The results showed that short-term stops and unloading during loading influence on the value of critical deformation, at which the manifestation of the jerky flow begins. The evolution of inhomogeneous strain fields and local strain rates under conditions of manifestation of jerky flow during tension with torsion tests of Al-Mg alloy samples.
Highlights
R eal conditions of operation and complex external thermomechanical influences determine the operation of the loaded elements of critical structures in the conditions of a complex stress state
Aluminum-magnesium alloys exhibit a tendency to dynamic strain aging at relatively low homologous temperatures, which leads to the appearance of numerous stress discontinuities in the tensile curves
An urgent task of the experimental study of the PLC effect is to determine the region of existence of instability in order to exclude it from the real modes of processing products
Summary
R eal conditions of operation and complex external thermomechanical influences determine the operation of the loaded elements of critical structures in the conditions of a complex stress state. The effects of discontinuous fluidity lead to a significant decrease in strength and ductility, reduce the quality of the surface of the material, affect the technological process of processing [1-7 and etc.]. Of particular interest is the experimental study of inelastic deformation of structural materials, taking into account their processing in real technological processes, characterized by non-monotonicity and complexity of deformation paths, loading modes (including the imposition of monotonous and oscillating vibrational influences), and the properties of the loading system [9,10,11,12]. The aim of this work is to solve the methodological issues of experimental study of the regularities of the nucleation and propagation of deformation bands of localized plastic flow, determination of the boundaries of unstable plastic deformation of the AMg6 alloy under conditions of complex loading. The choice of the AMg6 alloy was determined by the importance of the problem of stability of its deformation behavior in connection with its wide application in aviation engineering, shipbuilding, chemical industry and transport engineering
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