A novel parameter to describe the glass-forming ability of alloys

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[1] Park, E.S.
[2] Ryu, C.W.
[3] Kim, W.T.
[4] Kim, D.H.
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Kim, D.H. | 1600年 / American Institute of Physics Inc.卷 / 118期
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In this paper; we propose a new parameter for glass-forming ability (GFA) based on the combination of thermodynamic (stability of stable and metastable liquids by ΔTm=Tmmix-Tl and ΔTx=Tx-Tg; respectively) and kinetic (resistance to crystallization by Tx) aspects for glass formation. The parameter is defined as Ε=(ΔTm+ΔTx+Tx)/Tmmix without directly adding Tg while considering the whole temperature range for glass formation up to Tmmix; which reflects the relative position of crystallization curve in continuous cooling transformation diagram. The relationship between the Ε parameter and critical cooling rate (Rc) or maximum section thickness for glass formation (Zmax) clearly confirms that the Ε parameter exhibits a better correlation with GFA than other commonly used GFA parameters; such as ΔTx (=Tx-Tg); K; (=[Tx-Tg]/[Tl-Tx]); ΔT∗(=(Tmmix-Tl)/Tmmix); Trg; (=Tg/Tl); and γ (=[Tx]/[Tl+Tg]). The relationship between the Ε parameter and Rc or Zmax is also formulated and evaluated in the study. The results suggest that the Ε parameter can effectively predict Rc and Zmax for various glass-forming alloys; which would permit more widespread uses of these paradigm-shifting materials in a variety of industries. © 2015 AIP Publishing LLC;
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