Zr50.5Al9Ni13.05Cu27.45 metallic glass matrix composites containing in-situ martensite CuZr phase were prepared by copper mould injection method to improve the deformation ability of bulk metallic glass.Microstructure

thermal behavior

compressive behavior and fracture morphology of the metallic glass composites with different diameters were analyzed by Xray diffraction（XRD）

TEM（transmission electron microscope）

DSC（differential scanning calorimetry）

material testing system and SEM（scanning electron microscope）.The results reveal that

with increasing in diameter of the alloy and decreasing in cooling rate

mechanical properties of the bulk metallic glass composites are improved as a result of particle martensite CuZr phase as secondary phase precipitated from the amorphous matrix

where compressive strength and strain reach up to approximately 2190MPa and 8%

respectively

which are attributed to numerous coherent twin boundaries in the CuZr phase effectively restraining localization propagation of shearing band and inducing the seeding and branching of multiple shearing band to delay the generation and propagation of cracks.