Structural Relaxation of Ni-Si-B Amorphous Ribbon

Abstract

The structural relaxation of the Ni-Si-B amorphous ribbon was studied by means of differential scanning calorimetry and thermomechanical analysis. It was shown that considerable length changes associated with reversible structural relaxation were revealed after a previous creep applied at higher temperatures.PACS numbers: 61.43.Dq, 62.20.Hg IntroductionSome amorphous alloys represent a class of metallic materials with unique mechanical and soft magnetic properties. They are unstable from a thermodynamic point of view and annealing them at elevated temperatures leads to structural relaxation manifesting itself in changes of various physical properties [1][2][3]. Atomic disorder and defects of different levels play the important role in magnetic properties of metallic glasses [4][5][6].Glassy alloys with a high Ni content were found to exhibit a glass transition before crystallization. The combination of high glass-forming ability and good mechanical and soft magnetic properties of the Ni-based glassy alloys indicates their perspective applications [7]. The homogeneous deformation ability is influenced by the structure of amorphous alloys, namely by the amount and mobility of defects. Therefore creep and creep recovery experiments can help understanding these phenomena [8,9]. The aim of the presented work was to find out how the creep applied at different temperatures influences the reversible structural relaxation of the Ni-rich amorphous alloy.

Effect of atomic number and atomic weight on time-dependent inelastic deformation in metals

“…Many researchers studied some related subjects such as creep, relaxation and plastic deformation [1][2][3][4][5][6][7][8][9][10]. For example, pulling out and extraction of a stainless steel wire inserted into an epoxy resin have been analyzed as a function of the embedded length using shear lag model [1].…”

“…In addition, creep exponential Dorn law was used for predicting creep behavior of the composites [4]. Also, the aim of the work presented in reference [7] is to find how the creep applied at different temperatures influences the reversible structural relaxation of the Ni-rich amorphous alloy. Zhang et al [8] analyzed experimentally viscous creep occurring in perpendicularly aligned carbon nanotubes (VA-CNTs).…”