The activation energy and volume of flow units of metallic glasses

2012 ◽  
Vol 67 (1) ◽  
pp. 9-12 ◽  
Author(s):  
S.T. Liu ◽  
Z. Wang ◽  
H.L. Peng ◽  
H.B. Yu ◽  
W.H. Wang
Keyword(s):  
Activation Energy ◽  
Metallic Glasses ◽  
Flow Units

Critical growth and energy barriers of atomic-scale plastic flow units in metallic glasses

2021 ◽  
Vol 202 ◽  
pp. 114033
Author(s):  
J.H. Yu ◽  
L.Q. Shen ◽  
D. Şopu ◽  
B.A. Sun ◽  
W.H. Wang
Keyword(s):  
Plastic Flow ◽  
Metallic Glasses ◽  
Critical Growth ◽  
Atomic Scale ◽  
Energy Barriers ◽  
Flow Units

scholarly journals Guiding shear bands in bulk metallic glasses using stress fields: A perspective from the activation of flow units

2020 ◽  
Vol 102 (13) ◽  
Author(s):  
K. Kosiba ◽  
S. Scudino ◽  
J. Bednarcik ◽  
J. Bian ◽  
G. Liu ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Stress Fields ◽  
Flow Units

Signature of viscous flow units in apparent elastic regime of metallic glasses

2012 ◽  
Vol 101 (12) ◽  
pp. 121906 ◽  
Author(s):  
Z. Wang ◽  
P. Wen ◽  
L. S. Huo ◽  
H. Y. Bai ◽  
W. H. Wang
Keyword(s):  
Viscous Flow ◽  
Metallic Glasses ◽  
Elastic Regime ◽  
Flow Units

The role of time in activation of flow units in metallic glasses

2015 ◽  
Vol 67 ◽  
pp. 47-51 ◽  
Author(s):  
T.P. Ge ◽  
X.Q. Gao ◽  
B. Huang ◽  
W.H. Wang ◽  
H.Y. Bai
Keyword(s):  
Metallic Glasses ◽  
Flow Units

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.

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
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