Relationship between the shear modulusG, activation energy, and shear viscosityηin metallic glasses below and aboveTg: Directin situmeasurements ofGandη

2009 ◽  
Vol 79 (13) ◽  
Author(s):  
V. A. Khonik ◽  
Yu. P. Mitrofanov ◽  
S. A. Lyakhov ◽  
A. N. Vasiliev ◽  
S. V. Khonik ◽  
...  
Keyword(s):  
Activation Energy ◽  
Metallic Glasses

Stability of the Pd-Co-Ni-Cu-P Metallic Glasses

2007 ◽  
Vol 1048 ◽  
Author(s):  
Daisuke Fukamaki ◽  
Tsunehiro Takeuchi ◽  
Masashi Hasegawa ◽  
Kazuo Soda ◽  
Hirokazu Sato ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Analysis ◽  
Free Energy ◽  
Electronic Structure ◽  
Metallic Glass ◽  
Internal Energy ◽  
Metallic Glasses ◽  
Photoemission Spectroscopy ◽  
First Principle ◽  
Cluster Calculations

AbstractStability of Pd-Co-Ni-Cu-P metallic glass was investigated in terms of free energy using first principle cluster calculations, thermal analysis, and photoemission spectroscopy measurements. We found that the internal energy of the Pd-based metallic glasses is dominated by the electronic structure near the Fermi level. The analyses on the electronic structure and local atomic arrangements indicate that the substitution of cobalt or a hypothetical atom Co0.5Cu0.5 for nickel in the Pd40Ni40P20 metallic glass decreases the free energy of the Pd-Ni-P metallic glass by increasing entropy without altering significantly internal energy. On the basis of the idea mentioned above, we prepared Pd28Co24Ni24P24, Pd25Co25Ni25P25 and Pd40Co40/3Ni40/3Cu40/3P20 metallic glasses. These metallic glasses certainly showed the nearly highest TX, which directly reflect the activation energy against crystallization, among the Pd-based metallic glasses ever reported.

Correlation between effective activation energy and pre-exponential factor for diffusion in bulk metallic glasses

1999 ◽  
Vol 14 (8) ◽  
pp. 3200-3203 ◽  
Author(s):  
S. K. Sharma ◽  
F. Faupel
Keyword(s):  
Activation Energy ◽  
Metallic Glasses ◽  
Effective Activation Energy ◽  
Bulk Metallic Glasses ◽  
Supercooled Liquid ◽  
The Novel ◽  
Effective Activation ◽  
Exponential Factor ◽  
Liquid States ◽  
Fitting Parameters

The values of effective activation energy (Q) and pre-exponential factor (D0) reported in the literature for diffusion in the novel bulk metallic glasses, both in the glassy and the deeply supercooled liquid regions, are found to follow the same correlation as reported earlier in conventional metallic glasses, namely D0 = A exp(Q/B), where A and B are fitting parameters with values A = 4.8 × 10−19 m2 s−1 and B = 0.056 eV atom−1. A possible explanation for the observed values of A and B is given by combining an activation energy and a free volume term. The interpretation favors a cooperative mechanism for diffusion in the glassy and deeply supercooled liquid states.

Determination of the activation energy spectrum of structural relaxation in metallic glasses using calorimetric and shear modulus relaxation data

2014 ◽  
Vol 116 (12) ◽  
pp. 123507 ◽  
Author(s):  
A. N. Tsyplakov ◽  
Yu. P. Mitrofanov ◽  
A. S. Makarov ◽  
G. V. Afonin ◽  
V. A. Khonik
Keyword(s):  
Activation Energy ◽  
Energy Spectrum ◽  
Shear Modulus ◽  
Metallic Glasses ◽  
Structural Relaxation ◽  
Relaxation Data

The thermal stability and activation energy of crystallization of (Cu61.8Zr38.2)1−xAlx bulk metallic glasses

2007 ◽  
Vol 353 (32-40) ◽  
pp. 3421-3424 ◽  
Author(s):  
Qing Wang ◽  
Jianbing Qiang ◽  
Yingmin Wang ◽  
Junhai Xia ◽  
Huogen Huang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Stability ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Activation Energy Of Crystallization
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