Sm-Co 永磁体通常非常脆，即使是轻微的撞击也很容易受到影响。最近，通过模拟报道并通过实验证实，SmCo 5可以通过外应力激活的非晶剪切带发生塑性变形。由于大多数 Sm-Co 磁体主要由 Sm 2 Co 17相组成，因此有必要研究与 SmCo 5相（也存在于 Sm-Co 磁体中）相比，Sm 2 Co 17相如何变形。此外，应研究具有界面的两相复合材料的力学性能。在本文中，我们展示了 Sm 2 Co 17由于无定形剪切带的形成，相也可以在拉伸载荷下发生塑性变形。我们发现SmCo 5和Sm 2 Co 17之间的界面应力显着影响无定形剪切带的形成。无定形剪切带的形成能量低于穿晶、晶间和相间解理所需的能量。在界面处有缺口的两相样品也因拉伸载荷而变形。当无定形剪切带在 Sm 2 Co 17相中开始时，样品迅速向失效方向收缩。相反，当在 SmCo 5中引发无定形剪切带时阶段，样品可以容纳更多的应变。这些结果有助于我们了解 Sm-Co 磁体的内在机械性能。
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Mechanical properties of samarium cobalt: A molecular dynamics study
Sm-Co permanent magnets are usually very brittle which makes them vulnerable to even mild impacts. Recently, it was reported by simulation and confirmed by experiment that SmCo5 can be plastically deformed via amorphous shear bands activated by external stress. Since most Sm-Co magnets mainly consist of the Sm2Co17 phase, it is necessary to study how the Sm2Co17 phase can be deformed compared with the SmCo5 phase (existing also in Sm-Co magnets). In addition, the mechanical properties of the two-phase composites with an interface should be investigated. In this paper, we show that the Sm2Co17 phase can also be plastically deformed under tensile loading due to the formation of amorphous shear bands. We find that the interfacial stress between SmCo5 and Sm2Co17 significantly affects the formation of amorphous shear bands. The formation energies of amorphous shear bands are lower than the energies needed for transgranular, intergranular and interphase cleavage. The two-phase samples notched at the interface are also deformed by tensile loading. When the amorphous shear band is initiated in the Sm2Co17 phase, the sample quickly necks toward failure. In contrast, when amorphous shear band is initiated in the SmCo5 phase, the sample can accommodate more strain. These results help us understand the intrinsic mechanical properties of Sm-Co magnets.