Author(s)

G. Chen, X. Chen

Abstract

Bulk metallic glass (BMG) alloys have attractive mechanical properties for structural applications, and tungsten fibre reinforced bulk metallic glass matrix composite (BMGC) would further improve the properties compared to unreinforced BMG. Mechanical properties of Zr-based BMG reinforced with 80% tungsten fibres by volume are experimentally investigated in the present study at ambient temperature and elevated temperature up to 600°C. From static tests at different temperatures, it is observed that yield stress of BMGC decreases with temperature, and the strain hardening behaviour at ambient temperature vanishes at an elevated temperature. At ambient temperature the dynamic yield stress of BMGC from SHPB tests is approximately 30% higher than the quasi-static counterpart. However, the specimens in SHPB tests are found to have smaller strain capacity. Dynamic yield stresses are also found to decrease with the elevation of temperature. Based on the test data, an empirical formula is proposed to describe the change of yield stress due to temperature elevation.

Keywords

bulk metallic glass, tungsten fibre, mechanical properties, split Hopkinson pressure bar, elevated temperature