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采用自蔓延高温合成离心熔铸工艺可以快速制备出TiB_2基陶瓷-42CrMo合金钢层状复合材料,并在层间界面上形成TiB_2基陶瓷/Fe-Ni合金相三维网络跨尺度连续梯度复合结构,使层状复合材料分为陶瓷基体、中间过渡区与合金钢基底3层结构。通过材料力学性能测试并结合FESEM、HRTEM观察,得出正是由于层间界面上原位生成TiB_2基陶瓷/Fe-Ni合金的三维网络跨尺度连续梯度复合结构,使复合材料不仅具有高的弯曲强度与断裂韧性,而且又使之在三点弯曲测试时呈现出明显的“假塑性”力学行为特征。同时,陶瓷基体附近界面上TiB_2基陶瓷/Fe-Ni基合金复合结构裂纹互锁效应与中间过渡区上TiB_2微纳米/纳米晶沉淀强化机制的协同作用又使TiB_2基陶瓷-42CrMo合金钢层状复合材料具有高的层间界面剪切强度。
The TiB 2 -based ceramic-42CrMo alloy steel layered composites can be rapidly prepared by SHS process and the TiB 2 -based ceramic / Fe-Ni alloy phase three-dimensional network cross-scale continuous gradient composite structure is formed on the interlayer interface. Layered composite materials are divided into ceramic matrix, intermediate transition zone and alloy steel substrate 3 layer structure. Through the mechanical properties testing of materials and the observation of FESEM and HRTEM, it is concluded that the three-dimensional network of the TiB 2 -based ceramics / Fe-Ni alloy is formed by the continuous cross-scale continuous gradient composite structure, which makes the composite not only have high bending Strength and fracture toughness, but also make it obvious “pseudoplastic” mechanical behavior in three-point bending test. At the same time, the interlocking effect of TiB_2-based ceramics / Fe-Ni-based alloy composite structure cracks near the ceramic substrate and the synergistic effect of TiB_2 micro / nano-nano precipitation strengthening mechanism on the intermediate transitional region make TiB_2-based ceramic-42CrMo alloy steel layered The composite has high interlaminar shear strength.