The prepared Cu-0.2 Be-0.8 Co alloy was treated by 950 ℃×1 h solid solution+different deformation rate of cold deformation+480 ℃×4 h aging treatment

where the cold deformation rate are 10%

20%

30%

40%

50%

respectively. The hardness and conductivity rate of the alloy after different cold deformation treatments were tested by sclerometer and conductometer. The grain and precipitate characteristics are also observed and analyzed by optical microscopy（OM） and transmission electron microscopy（TEM）. The results indicate that different degrees of cold deformation between solution and aging have a significant effect on the hardness of the alloy

while little effect on the conductivity. Compared with the solution+aging treatment without cold deformation

the hardness and conductivity of the alloy reach 176 HB and 36.714 MS/m

respectively

with 50% cold deformation applied before aging

greatly increasing the hardness by 50.4% on the premise of small sacrificial conductivity. Grains of the alloy undergo different degrees of plastic deformation

where the morphology

dimension and distribution of precipitates are changed significantly

and the interaction with dislocations is increased. The cold deformation exerting reserves energy for subsequent aging precipitation

improving precipitation efficiency and precipitation rate

thus enhancing the hardness of the alloy significantly.