A nanostructure surface layer was fabricated on CuW70 alloy by supersonic fine particles bombarding
(SFPB) technology. The microstructure features of the surface layer were characterized by using XRD,
SEM, TEM observations. The results show that severe plastic deformation was produced on the surface of
SFPB-treated CuW70 alloy, a part of W particles were fragmented and become smaller on the surface,
while the Cu particles only exhibit deformation. The thickness of nanostructure surface layer increased
depending upon the treatment duration, the well technology was shot peening 60 min, in this case, the
thickness up to 21 mm, the grain refinement process of CuW70 alloy involved internal defects proliferation,
particles deformation and break up, grain refining of W, and strong plastic deformation of Cu
bonding phase. Finally, the random orientation of nano-crystal was formed on the surface.