标题：Toughening and strengthening mechanisms of Al2O3/Ti(C7N3) nanocomposite ceramic tool and die material
作者：Xu, Chong-Hai ;Jiang, Zhen-Yu ;Xiao, Guang-Chun ;Zhang, Jing-Jie ;Yi, Ming-Dong
作者机构：[Xu, Chong-Hai ;Jiang, Zhen-Yu ;Zhang, Jing-Jie ] School of Mechanical Engineering, Shandong Institute of Light Industry, Jinan 250353, China;[Xiao, G 更多
来源：Journal of Harbin Institute of Technology (New Series)
关键词：Ceramic tool and die material; Mechanical property; Nanocomposite; Toughening and strengthening mechanism
摘要：With the measurement and analysis of mechanical properties and microstructure, study on the toughening and strengthening mechanisms of Al2O3/Ti(C7N3) nanocomposite ceramic tool and die material. The result indicated that nano particles in Al2O3/Ti(C, N) nanocomposite ceramic tool and die material first can cause the fining of matrix grain by the pinning effect of boundary nano particles. The nano particles in the grain can also lead to toughening and strengthening simultaneously through the grain fining effect. The fracture mode is the mixture of both trans and intra granular fracture modes. As a result, the fracture energy is increased. Therefore, the induced transgranular fracture is one of the important toughening and strengthening mechanisms of nanocomposite ceramic tool and die material. Moreover, crack deflection, crack bridging, crack branching and grain pulling-out may contribute to the enhancement of the fracture toughness through the extension of the fracture path.