Cyclic Plasticity of Pure Aluminum Studies by Continuous Acoustic Emission Measurement
Continuous acoustic emission (AE) observed during plastic deformation of pure metals such as Aℓ or Cu is currently used for experimental verification of theoretical models which link the acoustic waves to microscopic mechanisms acting as emission sources. Indeed, in such materials, these mechanisms were well studied and only attributed to the dislocation movement. In a pure polycrystalline material, at the beginning of plastic deformation, Frank’s dislocation sources generate a great number of dislocations which can move over large distances in relation to the grain size. However, as the plastic deformation increases, these distances diminish as a result of the mutual interaction between dislocations.
KeywordsAcoustic Emission Cyclic Deformation Plastic Strain Amplitude Fatigue Stress Saturated Stage
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