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在 Ａｌ２ Ｏ３／ Ｔｉ Ｃ Ｎ 陶瓷刀具材料中适量添加稀土元素钇能显著提高其断裂韧性。本文运用 Ｓ Ｅ Ｍ 与 Ｔ Ｅ Ｍ 技术，对裂纹扩展模式进行了观察与分析，并从微观结构的角度探讨了其增韧机制。表明，由于稀土钇的添加，使材料内部形成不同程度的强弱界面，它们与扩展中的裂纹相互作用，致使基体与弥散相颗粒桥联、裂纹分支、裂纹偏转以及微裂纹等多种增韧机制得到明显增加和加强，它们共存于 Ａｌ２ Ｏ３／ Ｔｉ Ｃ Ｎ 陶瓷刀具材料中并协同作用，从而使其断裂韧性得到提高。
Appropriate amount of rare earth element yttrium in Al2 O3 / Ti C N ceramic tool material can significantly improve its fracture toughness. In this paper, the crack growth mode was observed and analyzed by using SEM and T E M techniques. The toughening mechanism was discussed from the perspective of microstructure. The results show that due to the addition of rare earth yttrium, different strength interfaces are formed in the materials, which interact with the expanding cracks, resulting in toughening of the matrix and the dispersed phase particles, crack branches, crack deflections and micro-cracks Mechanisms have been significantly increased and strengthened, and they co-exist in Al 2 O 3 / Ti C N ceramic tool materials and work synergistically to increase their fracture toughness.