A Concordant Shift Model for Flow in Bulk Metallic Glasses

doi:10.1007/s40195-016-0369-2

金属学报英文版 ›› 2016, Vol. 29 ›› Issue (2): 134-139.DOI: 10.1007/s40195-016-0369-2

收稿日期:2015-09-06 修回日期:2015-12-15 出版日期:2016-01-18 发布日期:2016-02-20

A Concordant Shift Model for Flow in Bulk Metallic Glasses

Gang Wang¹(), Zbigniew H. Stachurski²

1 Laboratory for Microstructures, Shanghai University,Shanghai 20044, China
2 Research School of Engineering, The Australian National University, Canberra, Australia

Received:2015-09-06 Revised:2015-12-15 Online:2016-01-18 Published:2016-02-20

摘要/Abstract

Abstract:

The homogeneous plastic flow in bulk metallic glasses (BMGs) must be elucidated by an appropriate atomistic mechanism. It is proposed that a so-called concordant shifting model, based on rearrangements of five-atom subclusters, can describe the plastic strain behaviour of BMGs in a temperature range from room temperature to the supercooled liquid region. To confirm the effectiveness of the atomic concordant shifting model, a comparative investigation between the vacancy/atom model and the concordant shifting model is carried out based on the estimation of the strain rate deduced from two models. Our findings suggest that the atomic concordant shifting model rather than the vacancy/atom exchange model can well predict the large strain rate in the superplasticity of BMGs.

Key words: Bulk, metallic, glasses, Superplasticity, Vacancy/atom, exchange, model, Atomic, concordant, shifting, model, Strain, rate

. [J]. 金属学报英文版, 2016, 29(2): 134-139.

Gang Wang, Zbigniew H. Stachurski. A Concordant Shift Model for Flow in Bulk Metallic Glasses[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(2): 134-139.

图/表 4

Fig. 1 A view of a primitive random cluster comprising an inner sphere, A, and 7 outer sphere. A five-atom subcluster (coloured in blue) can deform into the α formation under tensile elongation, or into the β formation in compression as shown on the right

Fig. 2 Schematic variation of potential energy for the α-β transformation event, showing an activation barrier at some critical value of h/r, where h is the height of the five-atom subcluster and r is the sphere radius

Fig. 3 Variation of potential energy of the system with applied elongation, manifesting a sudden drop associated with α-β event

Table 1 Comparison of the two models of homogeneous flow

Model	Concentration,c	Diffusivity,D (m²/s)	Diffusion distance, λ(m)	Predicted strain rate (s^-1)
Vacancy/atom	0.02 (free volume)	10^-19	10^-4	1 × 10^-8
Concordant	0.2 (every fifth atom)	10^-19	10^-9	1 × 10^-3

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