Activation volume and energy of bulk metallic glasses determined by nanoindentation

作者：Kraemer Lisa; Maier Kiener Verena; Champion Yannick; Sarac Baran; Pippan Reinhard

来源：Materials and Design, 2018, 155: 116-124.

DOI：10.1016/j.matdes.2018.05.051

• Bulk metallic glasses
• Activation volume
• Activation energy
• Nanoindentation strain rate jump tests
• High pressure torsion
• Thermal cycling

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 degrees 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.

• 出版日期2018-10-5