By Michael Miller, Peter Liaw
Bulk metal glasses are a brand new rising box of fabrics with many fascinating and specific houses, equivalent to excessive power, solid hardness, solid put on resistance, and excessive corrosion resistance that may be produced in close to web form elements. those amorphous fabrics have many assorted purposes from structural functions to biomedical implants.
A entire evaluation of bulk steel glasses is gifted: the foundations of alloy layout, glass formation, processing, atomistic modeling, desktop simulations, mechanical homes and microstructures.
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Bulk metal glasses are a brand new rising box of fabrics with many fascinating and targeted houses, similar to excessive power, strong hardness, strong put on resistance, and excessive corrosion resistance that may be produced in close to web form elements. those amorphous fabrics have many assorted purposes from structural functions to biomedical implants.
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Additional resources for Bulk metallic glasses: an overview
38) If we examine the Angell plot,50 a plot of log η vs. 54 This is a strong candidate for Ts, although we need confirmation by experiments or simulation. Now G and B are related by G 2(1 − 2ν ) . 159. 42) and the liquid fragility coefficient is given by m= ∂ logη (T ) ∂ (Tg / T ) = T =Tg 13 39(1 −ν ) = 13Kα = . 55 The two-body term represents covalency and decreases the Poisson’s ratio. Thus more covalent glasses, such as silicates, have low values of ν and show a strong liquid behavior. 5. This is the case for a fluid, such as water.
We should not be satisfied with simply using old concepts such as the free-volume, but should actively seek and introduce new ideas that may facilitate deeper understanding of bulk metallic glasses. That is why this field is an exciting one for researchers who have courage to face the unknown and welcome new challenges. 2 FREE-VOLUME THEORY The idea of free-volume goes back a long time. 8,9 But the success of Cohen and Turnbull5–7 in quantifying the concept made this idea widely applicable. They started with recognizing the difference between liquid and gas.
Mag. A 6, 1013–1034 (1961). 5. M. H. Cohen and D. Turnbull, Molecular transport in liquids and glasses, J. Chem. Phys. 31, 1164–1169 (1959). 6. D. Turnbull and M. H. Cohen, Free-volume model of the amorphous phase: Glass transition, J. Chem. Phys. 34, 120–125 (1961). 7. D. Turnbull and M. H. Cohen, On the free-volume model of the liquid–glass transition, J. Chem. Phys. 52(6), 3038–3041 (1970). 8. A. J. Batschinski, Examination of the inner friction of liquids. I, Z. Phys. Chem. 84, 643– 706 (1913).
Bulk metallic glasses: an overview by Michael Miller, Peter Liaw