LAUSR

Abstract The TixNixCu50-xZr50-x (X = 25,30,35,40) alloys with 2 mm in diameter were prepared by copper mold casting method studied in terms of fracture behavior, mechanical properties and electrochemical corrosion properties, in which composite structure with featureless amorphous matrix can be obtained. The crystalline phases embedded in the amorphous matrix to form bulk metallic glass composite have a positive on improving ductility of BMG. The four alloys were prepared and studied. Especially, the Ti40Ni40Cu10Zr10 alloy exhibits higher fracture strength and better plasticity. This alloy not only showed compressive fracture strength of 2204 MPa, but also exhibited large plastic strain of about 11.4%. Moreover, the superelasticity behavior is found to exist. In addition, electrochemical methods indicated the corrosion properties of the Ti40Ni40Cu10Zr10 alloy are higher than the other experimental samples in 3.5% NaCl and 1 mol/L NaOH solutions. Especially, all of the as-cast alloys are spontaneously passivated with a passive current density between 10−5 and 10−7 A/cm2 in NaCl solution. For electrochemical impedance spectra, all of the Nyquist plots are corresponding with the results of the potentiodynamic polarizations.