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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Radial cracks and fracture mechanism of radially oriented ring 2:17 type SmCo magnets
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Radial cracks and fracture mechanism of radially oriented ring 2:17 type SmCo magnets

机译：径向定向的2:17型SmCo环形磁体的径向裂纹和断裂机理

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摘要

Radially oriented ring 2:17 type SmCo magnets have different microstructure in the radial direction (easy magnetization) and axial direction (hard magnetization). The structure of the cross-section in radial direction is close-packed atomic plane, which shows cellular microstructure. The microstructure of the cross-section in axial direction consists of a mixture of rhombic microstructure and parallel lamella phases. So the magnets have obvious anisotropy of thermal expansion in different directions. The difference of the thermal expansion coefficients reaches the maximum value at 830-860 deg C, which leads to radial cracks during quenching. The magnets have high brittlement because there are fewer slip systems in crystal structure. The fracture is brittle cleavage fracture.
机译：径向取向的2:17环形SmCo磁体在径向（易磁化）和轴向（硬磁化）具有不同的微观结构。径向截面的结构是紧密堆积的原子平面，显示出细胞的微观结构。轴向横截面的微观结构由菱形微观结构和平行薄片相组成。因此，磁体在不同方向上具有明显的热膨胀各向异性。热膨胀系数的差异在830-860摄氏度达到最大值，这导致淬火过程中出现径向裂纹。磁体具有高脆性，因为晶体结构中的滑移系统较少。断裂为脆性劈裂断裂。

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