Propriedade microestrutural do refinamento da liga amorfa Al54Nb45B5 por moagem mecânica

Abstract

The presence of Niobium in the alloy creates regions of intermetallic phases contained in Al54Nb45B5 amorphous alloy which becomes a potent heterogeneous nucleation on the substrate for nucleation with dendritic presence of aluminum oxides due to diffusive processes on the surface of the amorphous alloy Al54Nb45B5. This alloy is extremely low cost and can be applied in many sectors of the chemical and petrochemical industry because its mechanical deformation is high due to the presence of (Nb or B) in the aluminum acting mainly as grain refiners to improve their mechanical and thermal properties by using the mechanical alloying. The combined use of Niobium and Boron (intermetallic phases are formed by adding Al and Nb powder), instead of Niobium or Boron, individually, is a highly effective way to refine the grain size of alloy Al Nb-B in its microstructure without causing inconvenience in lattice for unwanted deformations. For this purpose, the present study compares the effect of grain refining promoted by the addition of Niobium and Boron in Al54Nb45B5 obtained by high energy mill under argon atmosphere and characterized by X rays Diffraction (XRD), Scanning Electron Microscopy and Energy Dispersive (SEM/EDS).