Constitutive Rheological Modeling of Flow Serration Behaviour in Metallic Glasses Showing Nanocrystallization during Deformation

Yousfi, M. A.; Hajlaoui, K.; Tourki, Zoubeir; Yavari, A.R.

doi:10.1155/2011/910962

Cited by 4 publications

(2 citation statements)

References 66 publications

(88 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(5) where η s , η c andε s describe the shear softening, the increase viscosity according to the correlation between viscosity and the fraction of nanocristal solids [31] and the Spaepen s strain rate [6] respectively. The model involves a large number of material parameters which are defined in the Table 1.…”

Section: Constitutive Equations Of the Modelmentioning

confidence: 99%

Serrated flow model for metallic glasses under compressive loading

et al. 2013

Self Cite

View full text Add to dashboard Cite

A rheological model is proposed that incorporates the serrated flow nature of metallic glasses. It involves the process of the nucleation, propagation and the arrest of a shear bands in the samples subjected to compressive deformation at room temperature. Numerical resolution of the constitutive equations resulting from the model is compared with the stress-strain curve obtained from in-situ nano-compression test in SEM of Zrbased metallic glass. Parametric identification method was applied and enabled us to release the physical parameters of the model. The obtained results showed that the model is adequately valid to describe the experimental data and the almost adjustable model parameters are physically meaningful and comparable to literature.

show abstract

Section: Constitutive Equations Of the Modelmentioning

confidence: 99%

Serrated flow model for metallic glasses under compressive loading

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…Many methods have been tried to suppress shear-band propagation to improve the plasticity of MGs. For example, the self-locking effect of nanocrystals formed during the shearing process can prevent the propagation of shear bands [8]. The deceleration before reaching the maximum shear-band speed provides evidence to suppress the propagation, causing shear-band arrest [4].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Structural Signals of Shear-Band Formation in Zr46Cu46Al8 Metallic Glasses

et al. 2018

View full text Add to dashboard Cite

The evolution from initiation to formation of a shear band in Zr46Cu46Al8 metallic glasses is presented via molecular dynamics simulation. The increase in number and the decrease in average size of clusters with the quasi-nearest atoms being 0 correspond to the shear-band evolution from initiation to formation. When the shear band is completely formed, the distribution of the bond orientational order q6 reaches a minimum. The maximum of the number of the polyhedral loss of Cu-centered <0, 0, 12, 0> and the minimum of the number of the polyhedral loss of Zr-centered <0, 2, 8, 5> correspond to the shear-band formation. These findings provide a strong foundation for characterizing the evolution from initiation to formation of shear bands.

show abstract