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Plastic flow and fracture of amorphous intercrystalline layers in ceramic nanocomposites

机译：陶瓷纳米复合材料中非晶态晶间层的塑性流动和断裂

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摘要

A theoretical model has been proposed for describing the plastic flow and fracture of amorphous intercrystalline layers in ceramic nanocomposites. The mechanism of plastic deformation has been considered as homogeneous nucleation and growth of liquidlike phase inclusions subjected to plastic shear. It has been demonstrated using a nanoceramic material consisting of TiN nanocrystallites and Si_3N_4 amorphous layers as an example that, when the length of the amorphous layer is reached and a considerable dislocation charge is accumulated, these inclusions induce the formation and growth of Mode I-II cracks in neighboring amorphous layers. In this case, the possibility of opening and growing the crack depends very strongly on the test temperature, the layer orientation, and the size of nanoceramic grains. An increase in the temperature and the angle of orientation and a decrease in the size of nanoceramic grains favor an increase in the crack resistance.
机译：已经提出了用于描述陶瓷纳米复合材料中非晶态晶间层的塑性流动和断裂的理论模型。塑性变形的机理被认为是受到塑性剪切作用的液相状夹杂物的均匀成核和生长。已经证明，使用由TiN纳米晶体和Si_3N_4非晶态层组成的纳米陶瓷材料作为示例，当达到非晶态层的长度并且积累了大量的位错电荷时，这些夹杂物会诱导I-II型的形成和生长。相邻非晶层中的裂纹。在这种情况下，打开和扩展裂纹的可能性在很大程度上取决于测试温度，层取向和纳米陶瓷晶粒的尺寸。温度和取向角的增加以及纳米陶瓷晶粒尺寸的减小有利于抗裂性的提高。

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