Influence of plastic deformation by high-pressure torsion on the crystallization kinetics of a Pd40Ni40P20 bulk metallic glass

• Published in: Journal of alloys and compounds 2020-04, Vol.821, p.153254, Article 153254
• Main Authors: Zhou, Hongbo, Peterlechner, Martin, Hilke, Sven, Shen, Depeng, Wilde, Gerhard
• Format: Article
• Language: English
• Subjects: Activation energy; Amorphous materials; Atomic mobilities; Crystallization; Crystallization kinetics; Electron microscopy; Fluctuation electron microscopy; Heat measurement; Kissinger method; Metallic glass; Metallic glasses; Microscopy; Nucleation; Plastic deformation
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.153254

The influence of high-pressure torsion on the crystallization behavior of the pre-annealed Pd40Ni40P20 bulk metallic glass was investigated by differential scanning calorimetry and fluctuation electron microscopy. Calorimetry shows that deformation splits the single main crystallization peak into a two-step crystallization process including a primary and a main peak. This is in line with fluctuation electron microscopy, which shows a reduction of ordering upon deformation. The overall activation energy and the local activation energy of the crystallization were analyzed by the Kissinger and Kissinger-Akahira-Sunose methods, respectively. The primary crystallization peak occurs at a lower temperature but shows a higher activation energy due to the drastically accelerated atomic mobility. Deformation can accelerate the crystallization process by increasing the nucleation rate. •The influence of high-pressure torsion on the crystallization kinetics of the pre-annealed metallic glass was investigated.•HPT deformation splits the single main crystallization peak into a two-step crystallization process.•The primary crystallization peak occurs at a lower temperature but shows a higher activation energy.•HPT Deformation can accelerate the crystallization process by increasing the nucleation rate.