High-temperature dynamic compressive properties of two monolithic Zr-based amorphous alloys

This study investigated high-temperature dynamic compressive properties of two Zr-based monolithic amorphous alloys. Dynamic compressive tests were conducted in the temperature range from room-temperature to 380 °C using a compressive Kolsky bar, and then the test data were analyzed in relation to microstructure and fracture mode. Both the maximum compressive stress and total strain of the two amorphous alloys decreased with increasing test temperature because shear bands could propagate rapidly as the adiabatic heating effect was added at high-temperatures. Above the glass transition temperature (T_g), the total strain decreased more abruptly than the total strain measured between room-temperature and 300 °C because of the crystallization of amorphous phases. The alloy having lower T_g and larger ΔT showed the better total strain because of the lower viscosity, which could favorably affect the ductility.