SmCo6.6Nb0.4nanoflakes with TbCu7structure were successfully prepared by surfactant-assisted high energy ball milling(SA-HEBM)with heptane and oleic acid as milling medium.The microstructure,crystal structure and magnetic properties were studied by scanning electron microscopy,X-ray diffraction,and vibrating sample magnetometer,respectively.The effects of ball milling time on the c-axis crystallographic alignment and coercivity of the nanoflakes were systematically investigated.The research showed that the nanoflakes had an average thickness of 100 nm,an average diameter of 1μm,with an aspect ratio as high as 100.As the ball milling time increased from 2 to 8 h,the reflection peaks intensity ratio I(002)/I(101),which indicated the degree of c-axis crystal texture of the SmCo6.6Nb0.4phase,increased first,reached a peak at 4 h,and then decreased.Meanwhile,the coercivity of the nanoflakes also increased first,reached a peak at 13.86 kOe for 4 h,and then decreased. SmCo6.6Nb0.4nanoflakes with TbCu7structure were successfully prepared by surfactant-assisted high energy ball milling (SA-HEBM) with heptane and oleic acid as milling medium. Microstructure, crystal structure and magnetic properties were studied by scanning electron microscopy, X-ray diffraction, and vibrating sample magnetometer, respectively. These effects of ball milling time on the c-axis crystallographic alignment and coercivity of the nanoflakes were systematically investigated. The research showed that the nanoflakes had an average thickness of 100 nm, an average diameter of 1 μm , with an aspect ratio as high as 100. As the ball milling time increased from 2 to 8 h, the reflection peaks intensity ratio I (002) / I (101), which indicates the degree of c-axis crystal texture of the SmCo6 .6Nb0.4phase, increased first, reached a peak at 4 h, and then decreased.Meanwhile, the coercivity of the nanoflakes also increased first, reached a peak at 13.86 kOe for 4 h, and then decreased.