Activation volume and energy of bulk metallic glasses determined by nanoindentation

Lisa Krämer (1) , Verena Maier-Kiener (2) , Yannick Champion (3) , Baran Sarac , Reinhard Pippan (2)

1 Max-Planck-Institut fur Biologie = Max Planck Institute for Biology [Tübingen]
2 ESI - Erich Schmid Institute of Materials Science
3 SIMaP - Science et Ingénierie des Matériaux et Procédés

Nanoindentation strain-rate jump testing was used to determine activation volumes and energies of various metallic glasses and composites. Three different single phase metallic glasses and three composites (two with amorphous/crystalline Cu and one with an amorphous/amorphous structure) were investigated. The state of the materials was additionally changed by varying the testing temperature between room temperature and 430°C, by performing high pressure torsion and by thermal cycling. The results show that testing temperature is the main parameter controlling activation volume and energy, whereas material modifications by high pressure torsion and thermal cycling do not significantly affect them.

Mots clés: Nanoindentation strain rate jump tests; Activation energy; Activation volume; Thermal cycling; High pressure torsion; Bulk metallic glasses

Domaines: Matériaux

Lisa Krämer, Verena Maier-Kiener, Yannick Champion, Baran Sarac, Reinhard Pippan. Activation volume and energy of bulk metallic glasses determined by nanoindentation. Materials & Design, 2018, 155, pp.116-124. ⟨10.1016/j.matdes.2018.05.051⟩. ⟨hal-01807726⟩