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Toughening mechanisms and microstructure of Al_2O_3-TiC-Co composites

机译:Al_2O_3-TiC-Co复合材料的增韧机理和组织

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摘要

Cobalt-coated Al_2O_3-Tic composites were prepared by hot-pressing at 1650℃. Higher fracture toughness (7.81 MPa m½) and bending strength (782 MPa) were obtained for composites containing both intragran-ular and intergranular TiC grains. TiC grains were dispersed homogeneously with an incoherent interface in the Al_2O_3 matrix and most cobalt particles resided at triple grain junctions. Grain/subgrain refinement, dislocation activities, and dispersion strengthening mainly account for the toughening mechanisms.
机译:在1650℃热压制备了钴包覆的Al_2O_3-Tic复合材料。含有晶内和晶间TiC晶粒的复合材料均具有较高的断裂韧性(7.81 MPa m1 / 2)和弯曲强度(782 MPa)。 TiC晶粒以不连贯的界面均匀分散在Al_2O_3基体中,大多数钴颗粒位于三重晶界处。晶粒/亚晶粒细化,位错活动和弥散强化主要是增韧机制的原因。

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