Abstract
Acoustic emission methods are used to investigate the nature and evolution of microfracture damage during uniaxial compression of ductile amorphous and brittle crystalline metal foams made from a commercial Zr-based bulk metallic glass, and to compare this behavior against that of aluminum-based foam of similar structure. For the amorphous foam, acoustic activity reveals evolution of the damage process from diffuse to localized damage through the foam stress plateau region, and reversion back towards diffuse damage in the foam densification region. Accommodation of microfracture by surrounding ductile struts, and significant point contact formation, permit high average compressive strains of ca. 80% in the amorphous foam without macroscopic failure.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 857-865 |
| Number of pages | 9 |
| Journal | Intermetallics |
| Volume | 14 |
| Issue number | 8-9 |
| DOIs | |
| State | Published - Aug 2006 |
Funding
The authors acknowledge the financial support of the DARPA Structural Amorphous Metals Program (ARO Contract No. DAAD 19-01-1-0525) and thank the Caltech Center for Structural Amorphous Metals for providing supplies and facilities to arc-melt Vit106 buttons. The authors also thank Dr C. San Marchi (currently at Sandia National Laboratories, Livermore, CA) for his assistance during the early stages of the project and for fabrication of the pure aluminum foam used to investigate frictional noise levels.
Keywords
- B. Brittleness and ductility
- B. Glasses, metallic
- F. Mechanical testing
ASJC Scopus subject areas
- General Chemistry
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry