Mechanical properties of Al–Y–Ni amorphous ribbons

Abstract

Mechanical properties for two series of amorphous Al–Y–Ni ternary alloys were measured. Both series of alloys can be divided into two distinct groups. Those whose primary crystallization proceeds by growth of quenched-in Al nuclei and those which show a clear glass transition and their crystallization product is more complex. The Young’s modulus, ranging from 82.3 to 45.5 GPa in these series of alloys, is found to be correlated to the crystallization temperature and thermal behavior as well as the crystallization product implying that the mechanical properties depend on the short-range order in the glass.

An atomically quantized hierarchy of shear transformation zones in a metallic glass

“…In each run, the following cycle, consisting of three stages, was repeated 20 times: 0.2, 0.02, and 0.002 mN, each for 200 s. The stiffness measured from the instantaneous, elastic, displacement agreed with the calculated value, 19 based on a Young's modulus value of E 0 ¼ 48.2 GPa (Ref. 20) for a similar alloy. Displacement versus time data obtained during each full-load stage were used in the analysis, each consisting of 5000 points.…”

Microscopic description of flow defects and relaxation in metallic glasses

“…The volume fraction occupied by PSTZs of size n is given by [17] (Fig. 3), where E 0 is the high-frequency Young's modulus, 48.2 GPa [24]. This relationship is based on the determination that the STZs are at internal equilibrium, so that the ensembleaveraged strain of all n-size STZs is equal to the time-averaged strain of each n-size STZ.…”

Activation volume details from nonlinear anelastic deformation of a metallic glass

“…21into Eq. (19) and fitting the entire range of data yields γ T 0 ¼ 0:18 and Ω 21 ¼ 4:8 Â 10 À28 m 3 with random errors of 1.5% and 3%, respectively. Since the error in (γ T 0 ) 2 Â Ω 21 is much smaller, these two errors are strongly correlated.…”

“…with a random error of only a small fraction of a percent because this term appears in the exponent in Eq. (19). Substituting Eq.…”