Low-temperature compressive plasticity and charpy impact toughness of Zr-based metallic glass strip fabricated by twin-roll strip casting

Abstract

Metallic glasses display favorable mechanical properties at cryogenic temperature because of their distinctive atomic structure, which endows them with considerable potential for application in extreme environments. In this paper, we comparatively investigated the compression deformation behavior and the impact performances of the high-energy state Zr₅₅Cu₃₀Al₁₀Ni₅ metallic glass strip fabricated via twin-roll strip casting at both room and cryogenic temperature. Research indicates that low temperature can enhance the compressive strength of the high-energy state Zr-based metallic glass strip, raising it from approximately 1871 MPa at room temperature to approximately 2137 MPa at 77 K, with an increase of approximately 14 %. Low temperature can also to some extent suppress the shear softening of the metallic glass compressive specimen and enhance the uniformity of compressive plastic deformation. Additionally, high-energy state Zr-based metallic glass strip can still demonstrate excellent impact toughness at low temperature, with an impact toughness of 55.6 ± 1.6 kJ/m² at 77 K. This research substantiates that the high-energy state Zr-based metallic glass strip fabricated via twin-roll strip casting exhibit commendable mechanical properties at cryogenic temperature, which is important for facilitating their advancement as a novel type of engineering material for utilization in extreme low-temperature environments.