How the toughness in metallic glasses depends on topological and chemical heterogeneity
Abstract
This article reports and explains how the cavitation in metallic glasses is controlled by topological structure as well as chemical heterogeneity. It is shown that in the tough metal–metalloid Pd-Si metallic glass, cavitation initiation is controlled by both chemical separation and particular types of low coordination number (LCN) Pd-centered polyhedra. In contrast, cavitation in the brittle metal-metal Cu-Zr metallic glass is only governed by topological factors. A high-energy barrier to form LCN polyhedra and the process of chemical separation during cavitation initiation are believed to contribute to a higher metallic glass toughness, thereby allowing a larger plastic strain to fracture.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 15, 2016
- Source ID
- 10.1073/pnas.1607506113
Entities
People
- Danielle O. Duggins
- Konrad Samwer
- Marios D. Demetriou
- Michael C. Floyd
- Qi An
- William Andrew Goddard III
- William L. Johnson
Organizations
- California Institute of Technology
- Division of Materials Research
- United States Army Research Laboratory
- University of Göttingen