Microstructural nature of strengthening and toughening in Al2O3-SiC(p) nanocomposites

被引:33
作者
Anya, CC [1 ]
机构
[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England
基金
英国工程与自然科学研究理事会;
关键词
D O I
10.1023/A:1004729015686
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
It is demonstrated that neither of the theories based on flaw size, surface flaw healing or residual stress adequately and consistently explain the strengthening and toughening phenomena in Alumina-SiC nanocomposites. SiC presence reduces the amount of amorphous (glassy) silica rich phase (SRP) in the nanocomposite relative to that found in monolithic Alumina and to a level that the effect of SRP is negligible. The reduction of SRP and the multipliable effect of microstructural features such as dislocations, crack/particle interactions and cleavage steps, observed in these materials at an extraordinarily small scale (due to the nano-size of the SiC particles), are suggested to be more consistent in explaining these phenomena. Owing to the nano-scale at which these features operate, which is far below the practical resolution limit of the Scanning Acoustic Microscope (SAM), it is also argued that the latter may not be a good method for studying these materials. (C) 1999 Kluwer Academic Publishers.
引用
收藏
页码:5557 / 5567
页数:11
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