Phase transformation of germanium by processing through high-pressure torsion: strain and temperature effects

Abstract

Germanium has been processed by high-pressure torsion (HPT) under a nominal pressure of 24 GPa at room temperature and cryogenic temperature. The samples processed at room temperature were composed of a diamond-cubic Ge-I phase and a metastable tetragonal Ge-III phase. The formation of Ge-III was significantly suppressed and Ge-I and an amorphous phase, in addition to a small amount of body-centred-cubic Ge-IV, appeared in the case of cryogenic HPT processing at 100 K. The Ge-IV phase gradually disappeared at room temperature. These results indicated that shear strain and thermal energy are important for promoting the formation of Ge-III.

Keywords:

• High-pressure torsion
• severe plastic deformation
• germanium
• phase transformations
• metastable phases
• ultrafine-grained materials

Acknowledgements

This study used facilities of severe plastic deformation in the International Research Center on Giant Straining for Advanced Materials (IRC-GSAM) at Kyushu University.