Viscoplastic behavior of AA7075 aluminum alloy at high strain rate

다국어 초록 (Multilingual Abstract)

The flow stress increases with the increase in strain rate. This phenomenon is the strain rate effect of plastic deformation. Hopkinson experiment (10 2 –10 4 s −1 ) and metal cutting experiment (> 10 4 s -1 ) of AA7075 aluminum alloy were conducted at room temperature (20 °C) to better understand the strain rate effect of materials in a wider strain rate range.
Results show that when the strain rate is in the range of 1×10 4 –1.3×10 4 s −1 , the plastic deformation control mechanism of AA7075 aluminum alloy begins to change from thermal activation mechanism to dislocation damping mechanism. The viscous behavior of material deformation during cutting is shown as linear correlation between strain rate and stress.
Analysis of the deformation degree of cutting chips reveals that insufficient times for deformation and softening are the main reasons for the strain rate effect.

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