Now showing items 1-10 of 10
An atomically quantized hierarchy of shear transformation zones in a metallic glass
(American Institute of Physics, 2011-03-15)
Quasistatic measurements of room-temperature anelastic relaxation were used to characterize the
properties of shear transformation zones (STZs) in amorphous Al86.8Ni3.7Y9.5 in the dilute limit.
Using a combination of ...
Shear transformation zone analysis of anelastic relaxation of a metallic glass reveals distinct properties of α and β relaxations
(American Physical Society, 2019)
Metallic glasses with pronounced high-frequency β relaxation in their dynamic-mechanical response have been observed to exhibit large plasticity. Due to their disordered atomic structure, it is challenging to identify the ...
A comprehensive atomistic analysis of the experimental dynamic-mechanical response of a metallic glass
(Elsevier, Ltd., 2014)
It is shown that assumed anelastic relaxation-time spectra can be recovered reliably from simulated loss–modulus curves that include
noise by nonlinear least-squares fitting. The same method is used to obtain spectra for ...
Activation volume details from nonlinear anelastic deformation of a metallic glass
(AIP, 2019-11-11)
At high stress, the viscosity of a metallic glass is non-Newtonian, and therefore the rate of anelastic stress relaxation is not linear in the
applied stress. In this regime, one can obtain information on the details of ...
Evaluation of approximate measurements of activation-free-energy spectra of shear transformation zones in metallic glasses
(Elsevier, 2014-11-15)
For many years, the only experimental activation free energy spectrum for shear transformations in metallic glasses had been obtained by quenching from high temperature during creep, followed by temperature stepping (Argon ...
Room-temperature flow in a metallic glass -- strain-rate dependence of shear-band behavior
(Elsevier, 2011)
The rate dependence of serrated flow in amorphous Al86.8Ni3.7Y9.5 has been investigated by nanoindentation. Three samples, containing different initial amounts and distributions of free volume, were used: as quenched, cold ...
Microscopic description of flow defects and relaxation in metallic glasses
(American Physical Society, 2014)
Atomistic interpretation of the dynamic response of glasses
(Cambridge University Press, 2014)
Using detailed information on the spectrum of shear transformation dynamics previously obtained from low-strain, quasi-static anelastic relaxation
in a metallic glass, the corresponding response to a cyclic force is ...
The pitfalls of empirical fitting of glass relaxation data with stretched exponents
(AIP Publishing, 2018)
A stretched exponent is commonly used to fit experimental relaxation data for glasses, which typically exhibit a range of time constants. While it has been supported by theory for various processes, mostly near and above ...