OBSERVATIONS OF DAMAGE MORPHOLOGIES IN NACRE DURING DEFORMATION AND FRACTURE

被引：145

作者：

WANG, RZ

WEN, HB

CUI, FZ

ZHANG, HB

LI, HD

机构：

[1] Department of Materials Science and Engineering, Tsinghua University, Beijing

来源：

JOURNAL OF MATERIALS SCIENCE | 1995年 / 30卷 / 09期

关键词：

D O I：

10.1007/BF01184577

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The deformation, fracture and toughening mechanisms of nacre from a kind of fresh-water bivalve mollusc (Cristaria plicata) were studied by SEM, TEM and microindentation tests. Experimental results revealed a strong anisotropy of the damage behaviour reflecting the microstructural character of nacre. The fractured surface parallel to the cross-sectional surface of nacre was much more tortuous than that parallel to the platelet surface. The crack line on the cross-sectional surface was step-like, while that on the platelet surface was polygonal. Sliding of aragonite layer combined with the plastic deformation of organic matrix is the main plastic deformation mechanism of nacre. Three main toughening mechanisms have been found acting in concert: crack deflection, fibre pull-out and organic matrix bridging.

引用

页码：2299 / 2304

页数：6

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