Power-law scaling between mean stress drops and strain rates in bulk metallic glasses. (5th June 2016)

• Record Type: Journal Article
• Authors: Li, J.J.; Wang, Z.; Qiao, J.W.
• Is Part Of: Materials & design. Volume 99(2016)
• Page Start: 427
• Page End: 432
• Publication Date: 2016-06-05
• Subjects: Bulk metallic glass -- Shear bands -- Plasticity -- Strain rate dependence; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.03.092
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Discrete, jerky stress-drop bursts (serrated flows) during plastic deformation of a Zr-based bulk metallic glass exhibit different magnitudes in response to variant strain rates. Through the classical statistical analysis of stress-strain curves during serrated flow, plastic dynamic behavior changes from Gauss to the power-law distribution with increasing the strain rates. In addition, a quantitative liner relation between mean stress drops and the logarithm of strain rates is obtained to describe the influence of strain rates on mean amplitudes of the stress drop. The power-law scaling behavior is illustrated in different views including the strain-rate dependence, energy dynamics, the Poisson's ratio of material, and shear-banding operation. These results are helpful for understanding the serration behavior at room temperature. Graphical abstract: Highlights: Power-law scaling behavior is comprehensively illustrated in different views. A good liner relation between the logarithm of strain rates and mean stress drops in several systems is firstly found. The relationship between activation energy and Poissonʹs ratio in variant componential bulk metallic glasses is explained.