An expression for the calculation of Gibbs free energy difference of multi-component bulk metallic glasses

2007 ◽  
Vol 430 (1-2) ◽  
pp. 232-236 ◽  
Author(s):  
An-hui Cai ◽  
Hua Chen ◽  
Xiao-song Li ◽  
Hui Wang ◽  
Yong Zhou ◽  
...  
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Energy Difference ◽  
Free Energy Difference ◽  
Gibbs Free Energy Difference

New model of Gibbs free energy difference for bulk metallic glasses

2006 ◽  
Vol 435-436 ◽  
pp. 478-483 ◽  
Author(s):  
An-Hui Cai ◽  
Hui Wang ◽  
Xiao-Song Li ◽  
Hua Chen ◽  
Yong Zhou ◽  
...  
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Energy Difference ◽  
Free Energy Difference ◽  
New Model ◽  
Gibbs Free Energy Difference

Choose Gibbs free energy difference model for metallic glasses

2010 ◽  
Vol 356 (28-30) ◽  
pp. 1498-1501 ◽  
Author(s):  
An-hui Cai ◽  
Xiang Xiong ◽  
Yong Liu ◽  
Yong Zhou ◽  
Wei-ke An ◽  
...  
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Metallic Glasses ◽  
Energy Difference ◽  
Difference Model ◽  
Free Energy Difference ◽  
Gibbs Free Energy Difference

Glass Forming Ability of Ca-Based Bulk Metallic Glasses

2011 ◽  
Vol 171 ◽  
pp. 121-126 ◽  
Author(s):  
Ashmi T. Patel ◽  
Kirit N. Lad ◽  
Arun Pratap
Keyword(s):  
Metallic Glasses ◽  
Driving Force ◽  
Bulk Metallic Glasses ◽  
Energy Difference ◽  
Glass Forming Ability ◽  
Point Of View ◽  
Undercooled Liquid ◽  
Free Energy Difference ◽  
Glass Forming ◽  
Gibbs Free Energy Difference

Knowledge of glass forming ability (GFA) of amorphous metallic alloys is very important from both theoretical and practical point of view. Thermodynamically, the Gibbs free energy difference, ΔG between the undercooled liquid and the corresponding crystalline state is driving force for crystallization. As a consequence, it is a good indicator for glass forming ability of metallic glasses. A novel expression for ΔG has been used to estimate the GFA of recently developed Ca-based bulk metallic glasses viz. Ca53Mg23Cu24,Ca65Mg15Cu20,Ca40Mg25Cu35, Ca50Mg22.5Cu27.5 and Ca55Mg15Cu30. Different GFA criteria are also evaluated for systems taken up in the study and effect of addition of variation in composition of Ca-Mg-Cu system is also investigated. Present work suggests that among different GFA criteria, ΔG is the best criterion for the prediction of GFA for Ca-based bulk metallic glasses.

Gibbs Free Energy Difference in Bulk Metallic Glass Forming Alloys

2008 ◽  
Vol 279 ◽  
pp. 91-96 ◽  
Author(s):  
Heena Dhurandhar ◽  
Kirit N. Lad ◽  
Arun Pratap ◽  
G.K. Dey
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Activation Barrier ◽  
Energy Difference ◽  
Maximum Energy ◽  
Free Energy Difference ◽  
Glass Forming ◽  
Liquid Phases ◽  
Gibbs Free Energy Difference ◽  
Experimental Values

The Gibbs Free Energy Difference between the solid and liquid phases (DG) is related to nucleation frequency and has played an important role in predicting the glass forming ability (GFA) of multicomponent metallic alloys. This is due to the fact that the maximum energy for nucleus formation i.e. the activation barrier for nucleation has an inverse square relation with DG. The Gibbs Free Energy Difference of three multi-component bulk metallic glasses namely Mg65Cu25Y10, Zr57Cu15.4Ni12.6Al10Nb5 and Zr52.5Cu17.9Ni14.6Al10Ti5 have been evaluated using two new expressions. The results show that the DG values calculated assuming DCp to be constant lie closer to the experimental values for the Mg based system while in the case of two Zr based systems, DG computed using the hyperbolic variation of DCp show improved agreement with the experimental data.

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