Mechanical properties of AlYNi amorphous alloys

Abstract

AlYNi amorphous alloys with high mechanical strength and good bending ductility have been produced by rapid solidification technique. Vickers hardness ( H v), Young’s modulus ( E) and tensile fracture strength ( σ f) for the amorphous single phase are in the range 365–385 DPN, 71.5–82.2 GPa and 920–1150 MPA, respectively. The crystallized structure of the amorphous alloys consists of coexistent amorphous and fcc-Al phase with a particle size of 5–25 nm. The hardness and tensile fracture strength of these amorphous alloys containing the nanoscale Al particles increase to 550 DPN and 1450 MPA respectively, annealed at 400–550 K for 30 min. This increase in ( H v) and σ f is considered because the defect-free nanoscale fcc-Al particles homogeneously dispersed in the amorphous matrix effectively resist against shear deformation of the amorphous matrix. This paper describes in detail the effects of annealing temperature on microstructure and mechanical properties of AlYNi amorphous alloys.