Gibbs Free Energy Difference in Bulk Metallic Glass Forming Alloys

2008 ◽  
pp. 91-96
Author(s):  
Heena D. Dhurandhar ◽  
Kirit N. Lad ◽  
Arun Pratap ◽  
G.K. Dey
Keyword(s):  
Free Energy ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Gibbs Free Energy ◽  
Energy Difference ◽  
Free Energy Difference ◽  
Glass Forming ◽  
Gibbs Free Energy Difference

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.

Thermodynamics of The Pd43Ni10Cu27P20 Bulk Metallic Glass Forming Alloy

2003 ◽  
Vol 806 ◽  
Author(s):  
Masahiro Kuno ◽  
Ludi A. Shadowspeaker ◽  
Jan Schroers ◽  
Ralf Busch
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
Metallic Glass ◽  
Specific Heat ◽  
Bulk Metallic Glass ◽  
Gibbs Free Energy ◽  
Specific Heat Capacity ◽  
Undercooled Liquid ◽  
Glass Forming ◽  
Crystalline Mixture

ABSTRACTThe thermodynamics of the bulk metallic glass forming Pd43Ni10Cu27P20 alloy were investigated with differential scanning calorimetry (DSC). The specific heat capacity of the undercooled liquid with respect to the crystalline mixture was measured in the DSC simultaneously with the enthalpy of crystallization over the entire supercooled liquid region. The enthalpy, entropy, and Gibbs free energy change between the liquid and the crystalline mixture was determined from the specific heat capacity data. The calculated enthalpy function closely matched the enthalpies of crystallization that were measured in the DSC, which verifies the validity of the thermodynamic model used. A small Gibbs free energy difference between undercooled liquid and crystalline mixture was found for decreasing temperature in Pd43Ni10Cu27P20 when compared to other glass forming alloys. This reflects a small driving force for crystallization when undercooling this alloy and is the main contributing factor for its high glass forming ability.

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
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