Effects of Al addition on thermal stability and mechanical properties of Ti₄₀ Zr₂₅ Cu₈Ni₉Be₁₈ amorphous alloy

Effects of 5% Al content (atom) on the mi-crostructure, thermal stability and mechanical properties of Ti₄₀ Zr₂₅ Cu₈Ni₉Be₁₈ amorphous alloy in substituting and doping methods have been investigated by XRD, TEM, DSC and ambient compression testing. The experimental results demonstrate that the nano-crystalline and quasicrystalline in the amorphous alloy rod with 3 mm in diameters are precipitated respectively with Al addition in substituting and doping methods. The undercooled liquid region of the amorphous alloy ribbons is increased from 41 K to 50 K-in substituting methods while is decreased to 31 K in doping method. The compressive fracture stress is increased from 1 924 MPa to 2 121 MPa and the plastic strain is decreased from 3.9% to 0.2% in substituting method while is decreased to 1 475 MPa and exhibits plastic free strain in doping method with Al addition.