Untypical changes of electrical resistivity and viscosity of the La60Ni10Al25Cu5 metallic glass during crystallization

Abstract

Clarifying the crystallization behaviors of metallic glasses can not only provide useful information to understand the origin of high thermal stability and good glass-forming ability but also help to tailor the properties of composite materials. The untypical changes of both electrical resistivity and viscosity in the La60Ni10Al25Cu5 metallic glass during crystallization were studied. Electrical resistivity possesses a rise before the normal declining stage under both continuous heating and isothermal annealing. Meanwhile, the viscosity firstly remains almost constant, then changes with applied stresses under isochronal condition. Increase in viscosity proceeds in two stages when annealing at 488 K while that still shows stress-depended behavior at 510 K. DSC and TEM analysis suggest the much slower grain-growth crystallization kinetics which contributes to the untypical changes of this amorphous alloy. The results indicate that glass-forming systems with similar phenomenon still have good processing ability to fabricate composite materials with versatile geometries even after crystallization.