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The Influence of Texture Anisotropy on the Magnitude of the Acoustic Power Peak Emissions during Compression Testing of Magnesium Alloy ZX10
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DOI：10.1134/S1067821226600328.png)
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Abstract
En 中文
The paper examines the phenomenon of acoustic emission (AE) during monotonic deformation (compression) of magnesium alloy MgZnCa samples in five different structural states: cast, extruded, and all-round isothermal forging (isothermal multidirectional forging (IMF), IMF with subsequent extrusion, IMF with subsequent rolling. When deforming samples in the region of elastic-plastic transition, a traditional peak in the power of the AE signal is observed. The sources of acoustic emission are relaxation processes in the crystal lattice associated with the operation of deformation systems of slip and twinning in crystals. It is known that an increase in grain size increases, and hardening (work hardening) decreases the magnitude of the peak power AE; it is also well known that the intensity of AE depends on the activation mode of the deformation systems of the crystal lattice. The probability of activation of deformation systems is determined by the Schmidt factor, which was calculated for each grain of the microstructural map of the test metal, obtained by scanning electron microscopy with electron backscatter diffraction analysis. Based on these data, the proportion of material for which the current stress level exceeds the shear stresses of activation of deformation systems was calculated. It was found that for all five different structural states and for all orthogonal directions of load application, the peak power value of the acoustic emission signal, normalized to the grain size and surface area of the sample, is functionally related to the proportion of active grains.
Keywords:
magnesium
acoustic emission
extrusion
forging
rolling
texture
dislocation slip
twinning
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