Role of Si Minor Addition on Glass Formation and Flow Stress Characteristics of a Zr-Based Metallic Glass

Indah Raya,Nguyen Tan Danh,Samaher Al-Janabi,A Surendar,Tzu-Chia Chen,Ayad F Alkaim,Anatolij Sergeevich Utyuzh,Sigiet Haryo Pranoto,Yasser Fakri Mustafa

doi:10.1590/1980-5373-mr-2021-0245

Abstract

Abstract The characterization of strain rate effects near glass transition temperature (Tg) gives important information on flow behavior of metallic glasses (MGs). For this purpose, the tensile strain rate jump test was carried out near glass transition temperature to evaluate the flow behaviors of ZrCoAl(Si) MG ribbons. The primary thermal analyses showed that the Si minor addition into the ZrCoAl alloy leads to the betterment of thermal stability and the glass forming ability (GFA), correlated with the small size of Si atoms and subsequent formation of denser atomic clusters and thermodynamically liquid stabilization in the system. The tensile strain rate jump test indicated that minor adding of Si element decreases the sensitivity of glassy alloy to the flow stress and improves the stability of amorphous structure under increase in the strain rate and applied temperature. It was also observed that the viscosity behavior is more stable with the increase of the strain rate and temperature in the Si-added sample, implying the high capability of viscoplastic response in this state.

Highlights

As a distinct classification of metallic alloys, metallic glasses (MGs) possess unique properties such as high elastic limit, good wear behavior, superior yield strength and excellent corrosion resistance[1,2,3]
To clearly show the alloying composition effects, we considered a novel MG composition ZrCoAl(Si), in which the Si addition leads to the improvement of glass forming ability (GFA) in the amorphous system[33]
The Si minor addition increases the temperature of crystallization events (Tx); a slight decrement was detected in the Tg value

Summary

Introduction

As a distinct classification of metallic alloys, metallic glasses (MGs) possess unique properties such as high elastic limit, good wear behavior, superior yield strength and excellent corrosion resistance[1,2,3]. Several works have been done to identify mechanism of flow stress behavior of MGs under tensile loading and few studies have succeeded to improve tensile flow characteristics in amorphous alloys[6,7,8]. High temperature flow mechanism of MGs can be a turning point for deep understanding of their plasticity in various conditions[11,12,13]. For this purpose, there is a need to use a comprehensive model including various conditions

Methods

Results

Conclusion