Effect of annealing below crystallization temperature on structural and mechanical properties of Co66Si16B12Fe 4Mo2 metallic glass

Abstract

The influence of thermal treatment on the structural and mechanical properties of Co66Si16B12Fe4Mo 2 metallic glass has been investigated in present study. Co 66Si16B12Fe4Mo2 metallic glass has been subjected to isothermal annealing at 450°C for different time such as 1, 2, 5 and 8 h and studied by X-ray diffraction and scanning electron microscopy techniques. The Voight function analysis has been used for calculation of effective crystallite size and relative strain of all the annealed samples. The crystallite size has been found to be ̃ 40 - 60 nm after different h of annealing. The mechanical properties of above alloy before and after annealing has been studied by micro-hardness technique. Sample annealed for 8 h at 450°C becomes completely crystallized due to local structural rearrangements of the amorphous matrix by promoting the retention of nucleation during annealing and shows the maximum hardness among all crystalline and glassy samples.