Strengthening of Vickers indented 3Y-TZP by hydrothermal ageing

被引：15
作者：
Marro, F. G. [1 ,2 ]
Anglada, M. [1 ,2 ]
机构：
[1] Univ Politecn Cataluna, Ctr Res Nanoengn, CRnE, E-08028 Barcelona, Spain
[2] Univ Politecn Cataluna, Dept Mat Sci & Met Engn, E-08028 Barcelona, Spain
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2012年 / 32卷 / 02期
关键词：
ZrO(2); Fracture; Mechanical properties; Strength; Toughness and toughening; LOW-TEMPERATURE DEGRADATION; FRACTURE-TOUGHNESS; INDENTATION TECHNIQUES; FEMORAL-HEAD; ZIRCONIA; CRACK;
D O I：
10.1016/j.jeurceramsoc.2011.08.019
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of hydrothermal ageing on indentation cracks has been determined in 3Y-TZP by measuring the flexure strength of indented specimens before and after ageing. A substantial increase in strength was observed after ageing, in contrast to the well known decrease in strength in smooth specimens with only natural flaws. The increase in strength with ageing also occurs if the indentation residual stresses are previously removed by annealing. Observations around the crack tip show the formation of a highly microcracked zone during vapour exposure. Fractographic and micro-Raman analysis observations show that the profile of the cracks is marked on the fracture surface by this zone which is intergranular with a crumbled appearance and in which transformation has taken place. The increase in strength is discussed in terms of crack tip blunting induced by the multiaxial stresses that develop in front of the crack under bending. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：317 / 324
页数：8
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