Structural aspects of elasto-plastic deformation of a Zr-based bulk metallic glass under uniaxial compression

Structural periodicity in laser additive manufactured Zr-based bulk metallic glass

“…This technique is well established for investigating structural evolution [18][19][20] and strains in BMGs. [21][22][23][24][25] For the synchrotron measurements, thin strips ($1.5 Â 18 Â 0.15 mm 3 ) were cut from both the "center" and "edge" of the AMZ4 block with a low speed diamond saw (Buehler IsoMet) and the surface was ground with 4000 grit SiC paper to remove surface asperities. Samples were cleaned with acetone and ethanol and then adhered to an Al window (vacuum-grade Al, wire electrical discharge machined) for the X-ray measurements.…”

“…Based on the method developed by Poulsen 28 and further outlined by Shakur Shahabi et al, 23,24 it is possible to estimate the local strain from the variations in the G(r) peak position observed in Fig. 2(c), using e z ð Þ ¼ r cm z ð Þ À r 0 cm z ð Þ r 0 cm z ð Þ ;…”

“…24 In contrast, in situ mechanical compression measurements show strains on the order of 1.0%-2.0%. 23 These local strains are inherently linked to structural density within, and between, shear transformation zones. However, it is also important to note that the diffraction pattern is recorded over the entire interaction volume (2 Â 30 Â 150 lm 3 ), and actual local variations may indeed be more pronounced than the magnitudes reported here.…”

Plastic deformation induced anisotropy in metallic glasses: A molecular dynamics study

“…Indeed, glasses quenched at different rates are in different isoconfigurational states, characterized by its fictive temperature Tf, and their mechanical behavior is largely dependent on Tf [3,4]. MGs, ideally isotropic, can be anisotropic due to the solidification process [5], elastic and anelastic deformation [6,7], creep [8] and plastic inhomogeneous deformation [9]. While the atomistic origin of anelastic induced anisotropy has been attributed to bond-orientation anisotropy [8,10], the origin of flow induced anisotropy has not been unveiled yet.…”

Evolution of residual stress, free volume, and hardness in the laser shock peened Ti-based metallic glass

“…For the HEXRD, it has been used to explore the atomic structure changes of metallic glasses after heating [20] and loading [18,[21][22][23]. The atomic elastic strain (ε) at short and medium range scales in BMGs varies linearly with the loading stress in the elastic regime [21][22][23], since the ε storing in the BMGs could shift the diffraction peak, when the X-ray passes through the BMGs, the shift could be measured and the internal stress within the BMGs could be obtained [18,22]. It could be found the SEM/FIB instrument is applicable for the measurement of residual stress on the surface, while the HEXRD could give the internal stress.…”