Ti对Al2O3／Ni复合材料相界面润湿及力学性能的影响

以无压烧结方式制备了Ａｌ２Ｏ３／２０％Ｎｉ（Ｔｉ）（体积分数）复合材料．通过分析Ｔｉ元素的分布状态，研究了Ｔｉ添加剂对Ａｌ２Ｏ３／２０％Ｎｉ复合材料相界面润湿及力学性能的影响规律．结果表明，Ｔｉ元素集中分布在Ａｌ２Ｏ３／Ｎｉ相界面附近，并通过促进相界面润湿，强化相界面结合而显著改善复合材料的力学性能．实验成分范围内，随Ｔｉ含量增加，三点弯曲强度提高，而断裂韧性在３％Ｔｉ（质量百分数）时具有最大值，为６．２ＭＰａｍ１２．断口形貌分析表明，复合材料的增韧机理为桥接机理

Effects of Titanium on Interfacial Wetting and Mechanical Properties of Al 2O 3/Ni Composite Material

Composite mateials Al 2O 3/20%Ni(Ti) (volume percentage) were fabricated by pressureless sintering. Effects of titanium additives on interfacial wetting and mechanical properties of the material were studied by analysing the distribution of titanium. The results show that titanium mainly distributes along Al 2O 3/Ni intefaces,and by enhancing interfacial wetting and strengthening interfacial bonding,improves mechanical properties of the material dramatically. In the studied range,the three point bending strength increases with the increased amount of titanium additives,and the fracture toughness of the material has maximum value of 6 2 MPam 1/2 at 3% of titanium (mass percentage). Fracture surface analysis shows that bridging is the main toughening mechanism of the material.