An intriguing problem in condensed matter physics is understanding the glass transition, in particular the dynamics in the equilibrium liquid close to vitrification Recent advances have been made by using hydrostatic pressure as an experimental variable These results are reviewed, with an emphasis in the insight provided into the mechanisms underlying the relaxation properties of glass-forming liquids and polymers

https://iopscience.iop.org/article/10.1088/0034-4885/68/6/R03/pdf

Supercooled dynamics of glass-forming liquids and polymers under hydrostatic pressure

Shear stress induced reduction of glass transition temperature in a bulk metallic glass

The purpose of this study is to experimentally investigate the interaction of inelastic deformation and microstructural changes of two Zr-based bulk metallic glasses (BMGs): Zr41.25Ti13.75Cu12.5Ni10Be22.5 (commercially designated as Vitreloy 1 or Vit1) and Zr46.75Ti8.25Cu7.5Ni10Be27.5 (Vitreloy 4, Vit4). High-temperature uniaxial compression tests were performed on the two Zr alloys at various strain rates, followed by structural characterization using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Two distinct modes of mechanically induced atomic disordering in the two alloys were observed, with Vit1 featuring clear phase separation and crystallization after deformation as observed with TEM, while Vit4 showing only structural relaxation with no crystallization. The influence of the structural changes on the mechanical behaviors of the two materials was further investigated by jump-in-strain-rate tests, and flow softening was observed in Vit4. A free volume theory was applied to explain the deformation behaviors, and the activation volumes were calculated for both alloys.

/pdf/deformation-and-crystallization-of-zr-based-amorphous-alloys-4xgsetiw22.pdf

Deformation and crystallization of Zr-based amorphous alloys in homogeneous flow regime

We evaluated the effect of strain on the diffusion process of amorphous alloys related to the strain mode in both as-cast and plastically deformed Zr-based bulk amorphous alloy. Experimental investigations of the diffusion process and the elemental distributions in the amorphous alloy were performed by secondary ion mass spectrometry after annealing at 523 K following 30% plastic deformation by multiple cold rolling. Mathematical modeling analyses show an inhomogeneous sequence of the diffusion process by effective strain. The compressive strain near the surface of the deformed amorphous alloy retards ∼13.7% of the diffusion process compared to the as-cast amorphous alloy. The combined experimental and mathematical analyses results reveal that the diffusion process of bulk amorphous alloys can be changed by strain variation and can be adjusted by controlling the effective strain during deformation.

Strain dependence of diffusion in Zr-based bulk amorphous alloy

Mechanical Properties and Deformation Mechanisms of Metallic Glasses Under Hydrostatic Pressure

By means of the enthalpy recovery experiments in a Zr65Al7.5Cu27.5 metallic glass, the glass transition process was found to correlate with an obvious variation of enthalpy change with the annealing temperature. With this correlation, we developed an approach to determine the pressure effect on the glass transition temperature (T-g), and a drastic increment of T-g up to 50 K was observed in this glass when a hydrostatic pressure of 5 GPa was applied. It is much smaller than that observed in nonmetallic glasses, which is attributed to smaller activation volume of the relaxation in metallic glasses. (C) 2003 American Institute of Physics.

Pressure effect on glass transition in a Zr65Al7.5Cu27.5 metallic glass

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Pressure effect on glass transition in a Zr65Al7.5Cu27.5 metallic glass