Non-linear response of internal friction to tensile strain rate and frequency during plastic deformation of high-purity aluminium
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The internal friction of high-purity aluminium during the process of plastic deformation was measured by a middle torsion pendulum on a modified tensile testing machine. The effects of tensile strain rate, \(\dot \varepsilon \), in the range of 0.73×10−6 to 50×10−6s−1, and frequency of internal friction measurement, f, in the range of 0.38 to 2.6 Hz were studied. The results showed a non-linear dependence of internal friction, Q−1, on \(\dot \varepsilon \) and f−1 or on \(\dot \varepsilon /\omega \) (ω=2π f). The interrelationship between internal friction during the process of plastic deformation and dislocation motion, and the effect of non-linearity on the dynamic behaviour of dislocations are discussed.
KeywordsPolymer Aluminium Plastic Deformation Tensile Testing Dynamic Behaviour
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