A Modified Fictive Stress Model for Zr55Al10Ni5Cu30 Bulk Metallic Glass in Supercooled Liquid Region by Introducing a Time Relaxation Factor

Abstract:

Linear and nonlinear viscoelastic behaviors of a Zr₅₅Al₁₀Ni₅Cu₃₀ bulk metallic glass are investigated through experiments and described by the fictive stress model. Systematic deviations between the predicted stress-strain curves by fictive stress model and by the experimental results were found. In order to describe the flow stress curves of the Zr₅₅Al₁₀Ni₅Cu₃₀ BMG at different temperatures and strain rates in the supercooled liquid region more precisely, the fictive stress model was modified. The parameters of the model were optimized by the genetic algorithm, and a time relaxation factor Z' was introduced. The comparisons of the predicted compressive stress-strain curves and extrusion load-punch stroke curve by the modified fictive stress model with the experimental data show good agreements.

• Periodical: Advanced Materials Research (Volume 893)
• Pages: 449-456
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.893.449
• Online since: February 2014
• Authors: Zhi Hui Ma, Hong Juan Su, Xiang Huai Dong*
• Keywords: Bulk Metallic Glass, Constitutive Model, Fictive Stress, Supercooled Liquid Region

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