Indentation size effect and shear transformation zone size in a bulk metallic glass in two different structural states

2012 ◽  
Vol 60 (19) ◽  
pp. 6862-6868 ◽  
Author(s):  
In-Chul Choi ◽  
Yakai Zhao ◽  
Yong-Jae Kim ◽  
Byung-Gil Yoo ◽  
Jin-Yoo Suh ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Size Effect ◽  
Bulk Metallic Glass ◽  
Indentation Size Effect ◽  
Zone Size ◽  
Indentation Size ◽  
Transformation Zone ◽  
Shear Transformation ◽  
Shear Transformation Zone

Correlation between structural relaxation and shear transformation zone volume of a bulk metallic glass

2009 ◽  
Vol 95 (14) ◽  
pp. 141909 ◽  
Author(s):  
D. Pan ◽  
Y. Yokoyama ◽  
T. Fujita ◽  
Y. H. Liu ◽  
S. Kohara ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Structural Relaxation ◽  
Transformation Zone ◽  
Shear Transformation ◽  
Shear Transformation Zone

Change in Activation Volume for Plastic Deformation of Zr-based Bulk Metallic Glass following Annealing

2007 ◽  
Vol 1048 ◽  
Author(s):  
Jonathan B. Puthoff ◽  
Donald S. Stone ◽  
Hongbo Cao ◽  
Paul M. Voyles
Keyword(s):  
Plastic Deformation ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Activation Volume ◽  
Cast Alloy ◽  
Transformation Zone ◽  
Alloy Hardness ◽  
Shear Transformation ◽  
Shear Transformation Zone ◽  
The Individual

AbstractWe performed nanoindentation creep experiments on the bulk metallic glass Zr54Cu38Al8 in an effort to measure the scale of the individual deformation events responsible for plastic deformation. From a nanoindentation creep experiment, we can determine V*, the activation volume, which we interpret as the volume of a shear transformation zone (STZ) multiplied by the shear strain undergone by the STZ during thermal activation. For the as-cast alloy hardness, H, is 5.33 ± 0.06 GPa, and V* is 87 ± 5 Å3. The alloy was then annealed near Tg for 24 hr and retested. No crystallization occurred during annealing as verified by XRD and TEM. Following annealing H increased to 7.36 ± 0.08 GPa and V* increased to 160 ± 10 Å3. We interpret the change in V* as arising from an increase in the number of atoms involved in the STZ.

Indentation size effect in bulk metallic glass

2011 ◽  
Vol 64 (8) ◽  
pp. 753-756 ◽  
Author(s):  
Jae-il Jang ◽  
Byung-Gil Yoo ◽  
Yong-Jae Kim ◽  
Jun-Hak Oh ◽  
In-Chul Choi ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Size Effect ◽  
Bulk Metallic Glass ◽  
Indentation Size Effect ◽  
Indentation Size
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