Toughening mechanisms of nano-composite ceramics

被引：72

作者：

Tan, HL ^{[1
]}

Yang, W ^{[1
]}

机构：

[1] Tsing Hua Univ, Dept Engn Mech, Beijing 100084, Peoples R China

来源：

MECHANICS OF MATERIALS | 1998年 / 30卷 / 02期

基金：

中国国家自然科学基金;

关键词：

toughening mechanisms; fracture; ceramics; nano-particles;

D O I：

10.1016/S0167-6636(98)00027-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent experiments showed that nano-composite ceramics with particles distributed within the matrix grains and along the grain boundaries can acquire high toughening. The toughening of alumina ceramics with dispersed silicon carbide nano-particles are studied in the present paper. Three toughening mechanisms are identified: switching from the intergranular cracking to the transgranular one by nano-particles along the grain boundaries, fracture surface roughening by zigzag crack path perturbed by the internal stresses of nano-particles within the grains, and shielding by clinched rough surfaces near the crack tip. For different volume fractions of nano-particles, the estimated gross toughening agrees with the experiments. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：111 / 123

页数：13

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