Abstract

Highly time-resolved mechanical measurements, modeling, and simulations show that large shear bands in bulk metallic glasses nucleate in a manner similar to cracks. When small slips reach a nucleation size, the dynamics changes and the shear band rapidly grows to span the entire sample. Smaller nucleation sizes imply lower ductility. Ductility can be increased by increasing the nucleation size relative to the maximum (“cutoff”) shear band size at the upper edge of the power law scaling range of their size distribution. This can be achieved in three ways: (1) by increasing the nucleation size beyond this cutoff size of the shear bands, (2) by keeping all shear bands smaller than the nucleation size, or (3) by choosing a sample size smaller than the nucleation size. The discussed methods can also be used to rapidly order metallic glasses according to ductility.

Details

Title
Experimental evidence that shear bands in metallic glasses nucleate like cracks
Author
Long, Alan A. 1 ; Wright, Wendelin J. 2 ; Gu, Xiaojun 3 ; Thackray, Anna 1 ; Nakib, Mayisha 1 ; Uhl, Jonathan T. 1 ; Dahmen, Karin A. 1 

 University of Illinois at Urbana Champaign, Department of Physics, Institute of Condensed Matter Theory, Urbana, USA (GRID:grid.35403.31) (ISNI:0000 0004 1936 9991) 
 Bucknell University, Department of Mechanical Engineering, One Dent Drive, Lewisburg, USA (GRID:grid.253363.2) (ISNI:0000 0001 2297 9828); Bucknell University, Department of Chemical Engineering, One Dent Drive, Lewisburg, USA (GRID:grid.253363.2) (ISNI:0000 0001 2297 9828) 
 Bucknell University, Department of Mechanical Engineering, One Dent Drive, Lewisburg, USA (GRID:grid.253363.2) (ISNI:0000 0001 2297 9828) 
Publication year
2022
Publication date
2022
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2731321425
Copyright
© The Author(s) 2022. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.