Micromechanical mechanism of yielding in dual nano-phase metallic glass. (September 2018)

• Record Type: Journal Article
• Authors: Li, F.C.; Wang, T.Y.; He, Q.F.; Sun, B.A.; Guo, C.Y.; Feng, T.; Yang, Y.
• Is Part Of: Scripta materialia. Number 154(2018)
• Page Start: 186
• Page End: 191
• Publication Date: 2018-09
• Subjects: Amorphous alloys -- Nanocomposites -- Shear bands -- Size effect; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.05.050
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Through detailed experimental and theoretical analyses, here we uncover the mechanism of plasticity initiation in the Ni-P nano-grained metallic glass (NGMG) which contains nano-sized hard amorphous inclusions and soft amorphous inter-granular regions. In this dual nano-phase amorphous structure, plasticity is mainly initiated through the elongation and coalescence of the amorphous nano-grains, resulting in a shear band much wider than in its monolithic counterpart. Consequently, the NGMG turns out to be softer at the microscopic scale. At the fundamental level, our finding provides a universal mechanism which explains the unusual strength weakening observed in a variety of dual nano-phase amorphous systems. Graphical abstract: Unlabelled Image