Abstract
The Extended X-ray Absorption Fine-Structure (EXAFS) technique was used to study the time evolution of the structure of Nd-Fe-B metallic glass undergoing nanocrystallization during mechanical milling. Negative as well as positive fluctuations in atomic density were observed, providing direct evidence of the creation of deformation-induced pairs of free volume and anti-free volume defects. These defects migrated during milling, leading to the atomic redistribution and precipitation of nanocrystals. Our results demonstrate that atomic defects caused by deformation of metallic glasses involve more extensive athermal changes in short-range order than nearest neighbour bond breaking as suggested by the free volume model. (
| Original language | English |
|---|---|
| Pages (from-to) | 169-171 |
| Number of pages | 3 |
| Journal | Physica Status Solidi - Rapid Research Letters |
| Volume | 5 |
| Issue number | 5-6 |
| DOIs | |
| Publication status | Published - Jun 2011 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- General Materials Science
- Condensed Matter Physics
Keywords
- Defects
- Deformation
- Local structure
- Mechanical milling
- Metallic glasses