烧结Sm_2Co_(17)型永磁材料的力学性能及断裂行为的各向异性

A study of the anisotropy of mechanical properties and fracture behaviour in sintered Sm_2Co_(17)permanent magnetic materials

对从同一磁体上切取的取向方向不同的三组烧结Sm2 Co1 7试样的抗弯强度进行测定 ,对其抗弯断口进行宏观观察和扫描电镜观察 .对烧结Sm2 Co1 7型永磁材料的力学性能和断裂行为的各向异性进行了研究 .研究结果表明 :烧结Sm2 Co1 7型永磁材料的抗弯强度和断裂行为具有明显的各向异性 ,烧结Sm2 Co1 7型永磁材料断裂的微观机制为解理断裂 ,材料易于沿密排面 (0 0 0 1)面或沿与密排面的夹角大约为 6

The bending strength of three groups of samples with different oriented directions have been measured.All the samples were cut off from the same bulk of sintered Sm 2Co 17 magnet.The bending macrofractography has been carefully observed and scanning electron microscope has been used to study microfractography.The anisotropy of mechanical properties and fracture behaviour of sintered Sm 2Co 17 permanent magnetic materials are emphatically investigated.It shows that the bending strength and fracture behaviour of sintered Sm 2Co 17 permanent magnetic materials obviously display anisotropy.The fracture micromechanism of sintered Sm 2Co 17 permanent magnetic materials appears to be cleavage fracture and the materials tend to fracture in the close\|packed(0001)plane or in the plane which has about 60° angle with the former.