Deformation of Glass-Forming Metallic Liquids: Configurational Changes and Their Relation to Elastic Softening
ثبت نشده
چکیده
5.1 Abstract The change in the configurational enthalpy of metallic-glass-forming liquids induced by mechanical deformation and its effect on elastic softening is assessed. The acoustically measured shear modulus is found to decrease with increasing configurational enthalpy by a dependence similar to one obtained by softening via thermal annealing. This establishes that elastic softening is governed by a unique functional relationship between shear modulus and configurational enthalpy.
منابع مشابه
Anelastic to plastic transition in metallic glass-forming liquids.
The configurational properties associated with the transition from anelasticity to plasticity in a transiently deforming metallic glass-forming liquid are studied. The data reveal that the underlying transition kinetics for flow can be separated into reversible and irreversible configurational hopping across the liquid energy landscape, identified with beta and alpha relaxation processes, respe...
متن کاملSize-Dependent Viscosity in the Super-Cooled Liquid State of a Bulk Metallic Glass
We experimentally investigate the role of sample size on the viscosity of a bulk metallic glass by examining pressure driven flows in nm-scale confinement. A Pt57.5Cu14.7Ni5.3P22.5 metallic glass in the super-cooled liquid state is extruded into isolated cylindrical pores of varying nano-scale dimensions, down to 40 nm. The apparent viscosity of the liquid as a function of sample size is determ...
متن کاملSimilarities and Differences between the Glass Forming Mechanism in Polymers and Metallic Liquids
Survey of categorization of glass forming mechanisms in liquids based on the known principles reported in the literature is given. The metallic glass-forming liquids can be divided into two types – strong (with high glass forming ability) and fragile (with low glass forming ability). While the bulk amorphous alloys formed from strong liquids do not exhibit sensitivity to low temperature relaxat...
متن کاملA Tensile Deformation Model for In-situ Dendrite/Metallic Glass Matrix Composites
In-situ dendrite/metallic glass matrix composites (MGMCs) with a composition of Ti₄₆Zr₂₀V₁₂Cu₅Be₁₇ exhibit ultimate tensile strength of 1510 MPa and fracture strain of about 7.6%. A tensile deformation model is established, based on the five-stage classification: (1) elastic-elastic, (2) elastic-plastic, (3) plastic-plastic (yield platform), (4) plastic-plastic (work hardening), and (5) plastic...
متن کاملAn improved tensile deformation model for in-situ dendrite/metallic glass matrix composites
With regard to previous tensile deformation models simulating the tensile behavior of in-situ dendrite-reinforced metallic glass matrix composites (MGMCs) [Qiao et al., Acta Mater. 59 (2011) 4126; Sci. Rep. 3 (2013) 2816], some parameters, such as yielding strength of the dendrites and glass matrix, and the strain-hardening exponent of the dendrites, are estimated based on literatures. Here, Ti...
متن کامل