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Amplitude dependence of the internal friction in a Pb-62% Sn alloy
Summary
The amplitude-dependent internal friction of a Pb-62% Sn alloy was measured across its microplastic and superplastic states using flexural vibration, and a phenomenological model treating plasticity as a hybrid relaxation-hysteresis process was developed. The cyclic strain-hardening exponent was found to differ significantly between the microplastic and superplastic regimes.
The method of forced flexural vibrations is used to obtain the amplitude dependence of the internal friction (Q −1(ɛ0)) in the Pb-62% Sn alloy, which exhibits superplasticity at room temperature. A phenomenological model of the internal friction, in which the plasticity of alloys is considered as a hybrid relaxation-hysteresis process, is proposed. The numerical values of the cyclic-strain-hardening exponent n of the Pb-62% Sn alloy are determined in the microplastic and superplastic states, and the nature of the experimentally detected asymmetric maximum in Q −1(ɛ0) is discussed.