Effects of annealing temperature on the microstructure and microhardness of Zr

65

Cu

17.5

Ni

10

Al

7.5

metallic glass were investigated using differential scanning calorimetry（DSC）

X-ray diffraction（XRD）

scanning electron microscopy（SEM）and microhardness analysis.The glass transition temperature T

g

and the crystallization temperature T

x

are increased with increasing in heating rate.The structure of the sample keeps amorphous state after annealing at 623K（below T

g

）for 30min.Crystallization occurrs after the samples annealed at 723K（between T

g

and T

x

）

823Kand 923K（above T

x

）

and the crystalline phases are CuZr

2

and NiZr

2

.With increasing in annealing temperature

the crystallization degree is increased gradually and then reached saturation.The nucleation and growth of nano-size crystals occur

and the microhardness is increased firstly and then decreased gradually.