Pressure-induced amorphous-to-amorphous reversible transformation in Pr75Al25
Abstract
A pressure-induced amorphous-to-amorphous reversible transformation was revealed in Pr75Al25 metallic glass (MG) using in situ high-pressure synchrotron x-ray diffraction technique. The transition began at about 21 GPa with a ∼ 5% volume collapse and ended at about 35 GPa. This transition is reversible with hysteresis. Based on the high-pressure behaviors of Ce-based metallic glasses and Pr metal here, we suggest that the pressure-induced polyamorphic transition in Pr75Al25 MG stems from 4f-electron delocalization of Pr metal which leads to abrupt change in bond shortening. These results obtained here provide new insights into the underlying mechanism of the amorphous-to-amorphous phase transition in metallic glasses and will trigger more theoretical and experimental investigations for such transition.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- December 2013
- DOI:
- 10.1063/1.4841035
- Bibcode:
- 2013JAP...114u3516L
- Keywords:
-
- aluminium alloys;
- glass structure;
- high-pressure solid-state phase transformations;
- metallic glasses;
- praseodymium alloys;
- X-ray diffraction;
- 64.70.kj;
- 61.43.Fs;
- 62.50.-p;
- Glasses;
- Glasses;
- High-pressure effects in solids and liquids