Alloy samples of Cu47Zr46Al6Nb1 with 2

3and 5 mm in diameters were fabricated by copper mold casting method.The phase constitution

microstructure and mechanical properties of the alloys prepared were investigated by using X-ray diffraction

scanning electron microscopy and electronic testing machine.The results show that the sample with 2mm in diameter exhibits totally amorphous structure.CuZr and Cu10Zr7 phase are precipitated from the alloys with the decrease of cooling rate and the volume of Cu10Zr7 is increased with the increase of diameter.Under uniaxial compressive loading

the compressive fracture strength of the as-cast Cu47Zr46Al6Nb1 alloys with 2mm

3mm and 5mm in diameter reach 1 606、1 510 and 838 MPa

respectively

and the fracture surface is evolved from vein pattern（Φ2mm）to the coexistence of microscopic crack

pattern similar to the fracture of crystalline phase and vein pattern（Φ5 mm）.Moreover

influencing factors of precipitated Cu10Zr7 on mechanical properties and fracture surface of the alloy were described.