Effect of thermal history on performance of bulk metallic glass spacecraft components

Bulk metallic glasses (BMGs) are multi-element metal alloys with attractive properties for spacecraft applications. With recent advances in the BMG supply chain and commercialization, understanding the effects of thermal history associated with the manufacturing, integration, and service on performance of BMG components is critical for infusion. In this study, a Cu₄₃Zr₄₃Al₇Be₇ (at. %) BMG-forming composition, an alloy developed for gears for extreme-environment applications, was investigated. The thermal properties and structural glassy states resulting from different thermal treatments were studied with differential scanning calorimetry, microhardness, and four-point bending tests. It is shown that the thermal history and resulting structural states have a pronounced effect on some mechanical properties, highlighting the necessity of qualifying parts in different glassy states for their intended practical applications.