Correlation between fractal dimension and strength of brittle bulk metallic glasses

Abstract

In this paper, the strength of brittle bulk metallic glasses (BMGs) was investigated, and a corresponding theoretical model was proposed by modification of Griffith theory using fractal geometry. It was shown that the fracture energy and strength of brittle BMGs not only are related to the plastic zone size, the length scales of atomic order range and the surface energy but also has significant relationship with the fractal dimension in fracture surface. The strength of typical BMGs was also calculated by our improved model, which is in excellent agreement with the experimental data. This study provides a compelling approach for investigating and understanding the high strength of BMGs.

Electronic specific heats for amorphous and crystallized alloys

“…The solid lines are linear square fits of the data. The a data are taken from (Yang et al 2014a, b) and b data are taken from (Wang et al 2011; Yang et al 2014b; Vasiliev et al 2009)…”

“…As a new kind of material, amorphous alloy is known for its promising mechanical (Yang et al 2014a, b; Dun et al 2014), magnetic (Liu et al 2014; Xiang et al 2014), and chemical (Wang et al 2012) properties compared to its corresponding crystalline counterpart, and the great differences in properties between the two states are considered to be connected with their ordered or disordered microstructure. Meanwhile, recent study also has revealed that the short- or medium-range order exists at the atomic scale in amorphous alloy (Wang et al 2008).…”