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Analysis of the intragranular microstructure in ceramic nanocomposites and their effect on the mechanical properties
Author(s) -
Luo Junting,
Luo Shuyi,
Zhang Chunxiang,
Xue Yahong,
Chen Guoqing
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15729
Subject(s) - microstructure , materials science , nanocomposite , composite material , toughness , ceramic , transgranular fracture , fracture toughness , intergranular fracture , grain boundary
The formation of intragranular microstructure in Al 2 O 3 /ZrO 2 and Si 2 N 2 O/Si 3 N 4 nanocomposites was analyzed, and the effect of intragranular microstructure on the mechanical properties of nanocomposites was investigated. Results suggest 3 requisite conditions for the formation of intragranular microstructure and the role of intracrystalline glass phase and scar microstructure. In case of Al 2 O 3 /ZrO 2 , the intragranular microstructure leads to the formation of transgranular fracture, which in turn improves the mechanical properties via strengthening and toughening. On the other hand, in case of Si 3 N 4 /Si 2 N 2 O nanocomposites, intragranular microstructure reduces the possibility of bridging, pulling out, and crack deflection, thereby leading to the deterioration of strength and toughness. Based on these results, we can conclude that the formation of intragranular microstructure does not necessarily improve the mechanical properties in all kinds of materials. Rather, the effect of intragranular microstructure on the mechanical properties of nanocomposites is related to the strengthening and toughing mechanism of matrix materials.