| Autor: |
Pants, D., Inoue, A., Sakurai, T., Chen, M. W. |
| Předmět: |
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| Zdroj: |
Proceedings of the National Academy of Sciences of the United States of America; 9/30/2008, Vol. 105 Issue 39, p14769-14772, 4p, 1 Chart, 4 Graphs |
| Abstrakt: |
We report experimental characterization of shear transformation zones (STZs) for plastic flow of bulk metallic glasses (BMG5) based on a newly developed cooperative shearing model [Johnson WL, Samwer K (2005) A universal criterion for plastic yielding of metallic glasses with a (T/T[subg])[sup2/3] temperature dependence. Phys Rev Lett 95: 195501]. The good agreement between experimental measurements and theoretical predictions in the STZ volumes provides compelling evidence that the plastic flow of metallic glasses occurs through cooperative shearing of unstable STZs activated by shear stresses. Moreover, the ductility of BMGs was found to intrinsically correlate with their STZ volumes. The experiments presented herein pave a way to gain a quantitative insight into the atomic-scale mechanisms of BMG mechanical behavior. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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