Impact of micro-indentation load/time and Zinc concentration on the thermo-mechanical characteristics of amorphous Se$_{78}$Te$_{20}$Sn$_2$ alloy

TL;DR

This study investigates how micro-indentation load/time and zinc concentration influence the thermo-mechanical properties of amorphous Se78Te20Sn2 alloy using experimental and microscopic techniques.

Contribution

It introduces a comprehensive analysis of mechanical and physical properties of Se-based chalcogenide glasses with varying zinc content under different indentation conditions.

Findings

Hardness varies with load, time, and zinc concentration.

Thermal transitions and elastic modulus are characterized.

Mechanical parameters like micro-void energy and fragility index are evaluated.

Abstract

We have performed hardness measurement experiments under different loads and loading times by performing micro-indentation marks in the present work. Chalcogenide glasses (ChGs) comprising Se$_{78}$Te$_{20}$Sn$_2$ and Se$_{78-x}$Te$_{20}$Sn$_2$Zn$_x$ (where $x = 0, 2, 4, 6$) alloys are the subject of micro-indentation tests in this work. We have utilized both micro-indentation and optical microscopic methods to determine Vickers hardness. Thermal glass transition phenomena have been identified through DSC techniques. The modulus of elasticity (E), an essential mechanical property, has been evaluated using established empirical equations. Further, we have studied other mechanical parameters [e.g., minimal micro-void formation energy (Eh), glass's fragility index (m), micro-void volume (Vh), etc.] and the covalent character of the glassy system. Additionally, various physical parameters, including density, molar volume, and compactness, have also been determined.