Identifying the origin of strain rate sensitivity in a high entropy bulk metallic glass. (15th April 2019)

• Record Type: Journal Article
• Authors: Zhou, Qing; Du, Yin; Han, Weichao; Ren, Yue; Zhai, Haimin; Wang, Haifeng
• Is Part Of: Scripta materialia. Number 164(2019)
• Page Start: 121
• Page End: 125
• Publication Date: 2019-04-15
• Subjects: High entropy -- Bulk metallic glass -- Strain rate sensitivity; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.02.002
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A series of nanoindentation tests were performed on a high entropy bulk metallic glass (HE-BMG). At low peak-loads, high positive strain rate sensitivity was found. But increasing the peak-load, the sensitivity of hardness to strain rate decreased dramatically. At low peak-loads, sluggish diffusion in HE-BMG significantly impedes atomic arrangement in the shear yielding events, whereas at high peak-loads, the shear-band deformation is dominated by the shear front triggered events. The work showed the origin of strain rate sensitivity in HE-BMGs and might help for tailoring the mechanical properties. Graphical abstract: Unlabelled Image