Fictive temperature of glass
WebMay 3, 2002 · 1. Introduction. The fictive temperature (T f) of a glass is the temperature, at which the structure of an equilibrium liquid is frozen-in. T f is important for the glass science and technology because mechanical and optical properties of a glass strongly depend on thermal pre-history and fictive temperature .The microstructure, relaxation … WebAug 16, 2024 · The fictive temperature, which pertains to the material’s structure, can dramatically affect the toughness of metallic glass. Above, notched samples of metallic …
Fictive temperature of glass
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WebMay 3, 2002 · The Journal of chemical physics. 2007. TLDR. It is shown that the enthalpy overshoot of the calorimetric glass transition is enhanced by this treatment, and this enhancement is associated with a decrease in the apparent fictive temperature TfA that is determined using theEnthalpy-matching approach. 32. WebJACerS is a leading source for top-quality basic science research and modeling spanning the diverse field of ceramic and glass materials science. An equation derived by Ritland relating the cooling rate and fictive temperature for glasses without memory is extended to those with memory, i.e. those which exhibit a spectrum of relaxation times...
WebJul 11, 2007 · The thermodynamic stability is described through the concept of the fictive temperature (T f ), defined as the temperature at which the state variable (enthalpy or density) has the same value... WebApr 13, 2004 · When the fictive temperature equals the actual temperature, a linear relation exists between the cooling rate and the Maxwell relaxation rate, the slope of …
WebMar 14, 2016 · Fs-laser sources at 50–1000 kHz repetition rates and average power up to 10 W for a typical wavelength λ≃ 1 μm and pulse duration τp≃ 200 fs have reached an industrial grade in terms of reliability... WebThe thermal history of a glass can be characterized by the fictive temperature TF, a quantity introduced by Tool [22]. The fictive temperature is defined as the temperature at which the liquid structure is frozen when cooling down through the glass transition. In the glassy state TF is constant and dTF /dT =0. In the
WebFeb 11, 2013 · CT Moynihan, AJ Easteal, MA DeBolt, J Tucker, Dependence of the fictive temperature of glass on cooling rate. J Am Ceram Soc 59, 12–16 (1976). Crossref. …
WebMay 15, 2010 · Although the maximum fictive temperature at the fracture surface appears to be approximately 70–80 °C above the glass transition temperature, it is possible that a higher fictive temperature state was achieved during the fracture and relaxed to a lower fictive temperature state after the fracture due to short structural relaxation time of a … burger green peas sweetcorn gravyWebJul 11, 2007 · The room-temperature volume (and therefore density and material properties) of a glass depends on the fictive temperature T f at which the glass … halloween movies like trick r treatWebAug 16, 2024 · The fictive temperature, which pertains to the material’s structure, can dramatically affect the toughness of metallic glass. Above, notched samples of metallic glasses of different fictive temperatures (increasing from left to right) change from brittle to ductile, as indicated by the yellow-marked region ahead of the notch. burger halal barceloneWebMay 1, 2013 · The calculated time constant is an estimate of how fast the glasses fictive temperature will approach the actual temperature of the glass: (2) T f of glass = T f o − T f o − T 1 − exp − t / τ where T f is the fictive temperature of the glass (°C), T fo is the initial fictive temperature of the glass (°C) before heat treatment begins, t is time … halloween movies not goryWebJan 5, 2009 · The fictive temperature of the glass depends on its thermal history and varies with changes in the physical temperature (e.g., while heating or cooling … burger harlowWebStructural relaxation in glass. The structural relaxation model: can predict the behavior of glass at temperatures near the glass transition temperature; can be isotropic, orthotropic, or fully anisotropic; and. uses fictive temperature to describe the structure of glass. The following topics are discussed: burger happy hour near meWebtemperature on the structure was studied by two ways: cooling the glass-forming melts at different rates to sample the glass structure at different fictive temperature, and using high-temperature in situ NMR. The abundances of BO3 and NBO increase with increasing fictive temperature, suggesting that the reaction halloween movies not too scary