Internal Friction in Metallic Materials

Is “strain glass” a nanodomain frozen transition?

“…For the anelastic phenomenon (note that anelastic phenomenon is not a phase transformation! ), the internal friction is given by [21][22][23]…”

“…to overcome the local barrier E a at the temperature T, so the relaxation time [21][22][23] is assumed as…”

“…Combined Eq. (2) with the resonance condition vt ¼ 1, we can obtain the Arrhenius equation [21][22][23]:…”

“…3, we can fit the frequency (f) dependence of the internal friction peak T(f) with both the Vogel-Fulcher and Arrhenius relations for Ti-Ni and Au-Cu-Al alloys, respectively. As shown in Figure 2 (a) The relationship between internal friction Q À1 and vt. (b) The relationship between internal friction Q À1 and temperature [21]. Figure 3 (a) Temperature dependence of internal friction curves for Ti 48.…”

Room‐temperature dynamic quasi‐elastic mechanical behavior of a Zr–Cu–Fe–Al bulk metallic glass

“…In indentation, owing to significant stress concentration near the indent the shear bands are reported to initiate at load levels well beyond the point where some portion of the material exceeds the yield stress and cycling over this range can lead to activation of local shear transformation zones. However, the dynamical mechanical analysis (DMA) is a much more sensitive technique [31] to test local structure changes at low strain values before initiation of the shear bands. The effects of deformation and subsequent heat treatment on the crystallization behavior, the low-temperature heat capacity, enthalpy relaxation rate, and mechanical losses of two Pd-Ni-P-based bulk metallic glasses of slightly different compositions and different thermal stabilities have been recently investigated [32].…”