Probing the role of Johari–Goldstein relaxation in the plasticity of metallic glasses. Issue 9 (2nd September 2019)

• Record Type: Journal Article
• Authors: Zhang, M.; Chen, Y.; He, R. G.; Guo, S. F.; Ma, J.; Dai, L. H.
• Is Part Of: Materials research letters. Volume 7:Issue 9(2019)
• Page Start: 383
• Page End: 391
• Publication Date: 2019-09-02
• Subjects: Metallic glasses -- Johari–Goldstein relaxation -- plasticity -- nanoindentation; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2019.1620360
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: Johari–Goldstein (JG) relaxation closely relates to the shear transformation zones (STZs) in the flow of metallic glasses (MGs). However, the actual role played by JG relaxation in the STZ-evoked plastic deformation of MGs remains unknown. In this work, by substituting the transition metal (TM) element in La(TM)Al MGs (TM = Ni, Co, Cu, CuNi) to tune the feature of JG relaxation, how JG relaxation alters the deformation behaviors of MGs is tentatively examined with nanoindentation. The results demonstrate that JG relaxation modulates the anelastic to plastic transition rate in the plastic deformation accommodation of MGs via a characteristic relaxation time. GRAPHICAL ABSTRACT: IMPACT STATEMENT: A characteristic relaxation time revealing the role of Johari–Goldstein relaxation in the plasticity of metallic glasses as modulating the anelastic to plastic transition rate is characterized.