Acoustic anisotropy and localization of plastic deformation in aluminum alloys

Publication date: Available online 1 February 2020Source: Materials Today: ProceedingsAuthor(s): Dmitry Tretyakov, Alexander Belyaev, Nikita ShaposhnikovAbstractThe process of uniaxial inelastic tension of 20 mm thickness corset specimens made of aluminum-manganese alloy was investigated by ultrasonic non-destructive testing method based on measuring of acoustic anisotropy. The value of acoustic anisotropy defines as the phase shift between velocities of propagation of shear waves with orthogonal polarization. Acoustic measurements were carried out at different stages of stepwise loading of specimens with ultrasonic device used for non-destructive testing of stress-strain state of structures in nuclear and oil and gas industries. Nonlinear dependence of acoustic anisotropy on total axial inelastic deformations of specimens was established. It was found that acoustic anisotropy is an indicator of autowaves of plastic flow localized in surface layer of metal. The obtained results can be used for non-destructive ultrasonic testing of plastic deformations in thick structures made of aluminum alloys.
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research