Relationship between the heat flow and relaxation of the shear modulus in bulk PdCuP metallic glass

Understanding of the Structural Relaxation of Metallic Glasses within the Framework of the Interstitialcy Theory

“…Designating the shear susceptibilities in Equations (14) and (22) [77]). Then, with the above relationship and Ω = 1.38, one calculates β i = 17.5, which is quite close to β i = 20 derived by fitting to the calorimetric data for the same glass [95].…”

“…On the other hand, it is to be emphasized that Equation (22) is very similar, although not fully identical, to the heat flow law Equation (14) derived within the framework of the Interstitialcy theory. A detailed comparative analysis of these heat flow laws with the experimental data obtained on glassy P d 41.25 Cu 41.25 P 17.5 taken as an example was reported in [95]. It was found that both equations quite correctly describe both heat release well below T g and heat absorption near and above T g .…”

Mechanical Relaxation of Metallic Glasses: An Overview of Experimental Data and Theoretical Models

“…Hu [30] performed a survey of the sub-Tg aging and relaxation data of several metallic glasses obtained by DSC or DMA and they found a common relationship of Eβ = 26RTg. Although enthalpy changes can be the result of many different types of structural rearrangements while mechanical measurements respond only to shear deformation, comparison between as-quenched and relaxed samples using both enthalpy and mechanical techniques suggest that structural relaxation could be characterized by both of these techniques and the results are consistent [17,31]. However, as Chen pointed out [32], the secondary relaxation process observed from calorimetry in metallic glasses does not necessarily correspond to the one observed by shear deformation.…”

Theoretical analysis of the interconnection between the shear elasticity and heat effects in metallic glasses

“…This relationship was repeatedly tested on different metallic glasses. 2 It was found that it gives a good description of the kinetics of exothermal heat flow below T g and endothermal heat flow in the glass transition region both in the initial and relaxed states [22,[25][26][27]]. An example is given in Fig.…”

“…Refs. [22,[25][26][27]), fails at high temperatures T N T x (T x is the crystallization onset temperature). Recently, these problems were overcome by i) modification of the EMAT setup and ii) using samples of bulk glassy Zr 46 Cu 45 Al 7 Ti 2 , which combines relatively low internal friction as well as high viscosity and allows performing measurements above T x .…”