Effect of minor addition on dynamic mechanical relaxation in ZrCu-based metallic glasses

A fractal structural feature related to dynamic crossover in metallic glass-forming liquids

“…β is between 0 and 1, which reflects the shape of the distribution of timescales underlying the relaxation process. 52 It is commonly believed that the β value reveals the characteristics of structural relaxation dynamics and has an intimate linkage with dynamic heterogeneity. 53 By using the KWW equation, the curves of F s ( q , t ) for the α relaxation part were fitted, and the variations of β P ( P = 14 GPa) and β 0 ( P = 0 GPa) parameters with the scaled temperature T / T g are plotted in Fig.…”

Influence of Microalloying Process on Dynamic Mechanical Relaxation of ZrCo-Based Amorphous Alloy

“…is event is associated to the β and α relaxations, occurring under the glass transition temperature [29,30]. Finally, the contradictory behavior of moduli above 770 K is correlated to the nucleation and growth of crystals in the microstructure [25]. Using loss factor, it is possible to find out how the Ni microalloying process can change the relaxation behavior of ZrCoAl BMG.…”

“…Advances in Materials Science and Engineering temperatures for both samples; however, it is more pronounced in the ZrCoAlNi alloy. Using equation ( 1), it is feasible to calculate the activation energy of α relaxation [25]:…”

“…e results unveiled that the activation energy of β relaxation for the Nb-added BMG was significantly higher, which was derived from the generation of severe chemical heterogeneity in the atomic structure. In another study, it was found that the Pd addition into the ZrCuAgAl BMG retarded the relaxation dynamics, which was indicative of defect-concentration reduction in the structure [25]. Previously, it was found that the Ni addition enhanced the total negative heat of mixing and changed the atomic arrangement and population of clusters in the ZrCoAl system, leading to the improvement of glass forming ability and structural heterogeneity [26].…”

A hierarchically correlated flow defect model for metallic glass: Universal understanding of stress relaxation and creep

“…Therefore, versatile types of structural defects, e.g., these termed as flow units (Wang and Wang, 2019;Zhu et al, 2013), free volume (Turnbull and Cohen, 1970), shear transformation zone (Argon, 1979;Falk and Langer, 1998;Langer, 2015;Van Loock et al, 2021), interstitials (Granato, 2014;Mitrofanov et al, 2016) and quasi-point defects (Cheng et al, 2021b;Perez, 1990), have been proposed based on fluctuations of local density, enthalpy and entropy in amorphous solids.…”