Thermal stability and microhardness of new Co-based bulk metallic glasses

In this paper, thermal stability and microhardness of Co50Cr15Mo14C15B6 and Co48Cr15Mo14C15B6Er2 (numbers indicate at.%) glassy alloys were investigated. The two glassy alloys have high thermal stability. Glass transition temperature, supercooled liquid temperature range and reduced glass transition temperature are 819 K, 76 K and 0.58, respectively, for the Er-free alloy and 848 K, 85 K and 0.61, respectively, for the Er-containing alloy. The two glassy alloys exhibit high Vickers hardness of about 1.56 GPa and 1.58 GPa, respectively.