Load relaxation behavior of a Zr41.2Ti13.8Cu12.5Ni10 Be22.5 bulk metallic glass

Homogeneous deformation of Ti41.5Cu37.5Ni7.5Zr2.5Hf5Sn5Si1 bulk metallic glass in the supercooled liquid region

“…Accordingly, the region in the power dissipation map with high value of h indicates the superior formability where dynamic microstructural changes such as structural rearrangements in the BMGs or dynamic recrystallization in some crystalline materials are predicted with least thermal dissipation during hot working [48].…”

“…8. The number on each contour represents the power dissipation efficiency h. As we know, during the hot deformation of metallic glasses, most of the input power is used for structural rearrangements assisting viscous flow with least thermal dissipation when the maximum efficiency of power dissipation is over 0.8 [48,49]. So the region in power dissipation map where h > 0.8 and Table 2 Compressive deformation data of typical BMGs deformed in the supercooled liquid region.…”

Thermomechanical characterization of Cu47.5Zr47.5Al5 bulk metallic glass within the homogeneous flow regime

“…The application of the empirical onset times of crystallization determined by isothermal DSC to both the processing and deformation maps is not just a forced analogy, but is desirable because it allows the homogeneous flow properties to be discussed in a more simplified way. That is, it provides a simple means for separating the origin of homogeneous flow from the aforementioned concurrent nanocrystallization, which is generally known as a main factor of deteriorating the workability of BMGs as revealed by different groups [39,40]. When we determine the total time for hot deformation, we can calculate the lower limit of strain rate below which in situ crystallization during hot deformation takes place from the experimentally determined onset times of crystallization in Fig.…”

Evolution of structural and dynamic heterogeneities during elastic to plastic transition in metallic glass

“…27,32 Stress relaxation is a sensitive and effective instantaneous activation-relaxation technique to qualitatively investigate the properties of the flow units as well as their evolution as a function of time, temperature, and stress in MGs. [33][34][35][36][37] In this work, we apply this technique to investigate the distribution and evolution of energy barriers and relaxation time of flow units in the flowing process before yielding in MG. The results clearly reveal the slow flow with the activation and evolution process of the flow units and the evolution of structural and dynamic heterogeneities.…”