Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

Agus Dwi Anggono,Hussein Mhaibes Tuama,Aravindhan Surendar,Mustafa Z Mahmoud,Wanich Suksatan,Muneam Hussein Ali,Yasser Fakri Mustafa,Supat Chupradit

doi:10.1590/1980-5373-mr-2021-0494

Abstract

Structural rejuvenation is one of the key topics in the field of metallic glasses (MGs). In this work, we evaluated the combined effects of annealing treatment and elastic cyclic loading to discover pathways for promoting structural rejuvenation and improving the mechanical properties in the MGs. Using molecular dynamics (MD) simulations, it was revealed that the sole cyclic loading led to the increase of rejuvenation degree; however, a saturated state was observed upon the 40th cycle. On the other side, the sample exposed to the combined treatment exhibited a slight relaxation at the first step of cycling process and then a sharp rejuvenation degree was detected in the material. The thorough analyses indicated that the change in the fraction of coordination polyhedrons at the relaxation stage was the main reason for the extra rejuvenation in the sample exposed to the combined treatments. The results also suggest that the combination of rejuvenation treatments improves the magnitude of rejuvenation in the amorphous alloys. It should be noted that the increase of rejuvenation in the alloying systems accompanied with a reduction in the tensile strength and an enhancement in the homogenous plastic deformation.

Highlights

Owing to the absence of conventional structural defects, bulk metallic glasses (BMGs) show outstanding properties such as excellent compressive strength, extensive elastic limit and high corrosion resistance[1,2,3,4]
The results demonstrated that the degree of ΔE increment in the annealing/cyclic treatment is considerably higher than the MG alloy induced by the sole cyclic loading
This work aims to show the role of combined treatments on the magnitude of rejuvenation in the MGs

Summary

Introduction

Owing to the absence of conventional structural defects, bulk metallic glasses (BMGs) show outstanding properties such as excellent compressive strength, extensive elastic limit and high corrosion resistance[1,2,3,4]. Their embrittlement at the room temperature restricts their potential applications in the industries[5,6,7]. To tackle this problem, it was suggested to excite the atomic structure of glassy alloys, namely rejuvenation, leading to the higher energy state with the better plasticity[8,9]. Samavatian et al.[19,20,21] indicated that the tensile

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