scholarly journals Influence of Defects to Zr65Cu18Ni7Al10 Bulk Metallic Glass Properties Under Dynamic Compression

2022 ◽  
Vol 8 ◽  
Author(s):  
C. Zhang ◽  
D. Zhou ◽  
B. Hou
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Dynamic Compression ◽  
Average Distance ◽  
Shear Bands ◽  
Sample Surface ◽  
Transformation Zone ◽  
Shear Transformation ◽  
Shear Transformation Zone ◽  
Ductile To Brittle Transition

The Zr65Cu18Ni7Al10 bulk metallic glass with smaller diameter exhibits higher fracture strength under dynamic compression, which is ascribed to concentration of flow defect. The density of shear bands in the sample surface will increase with decreasing of the diameter, whereas, average distance and width of tear ridges in the fracture surface will increase with larger diameter. In addition, the volume of shear transformation zone can be estimated, which presents a ductile-to-brittle transition with the change of diameter. The physical graph of shear transformation zone can be obtained from the experimental analysis.

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.

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