EFFECT OF A LIQUID-PHASE ON SUPERPLASTICITY OF 2-MOL-PERCENT-Y2O3-STABILIZED TETRAGONAL ZIRCONIA POLYCRYSTALS

被引：120

作者：

HWANG, CMJ

CHEN, IW

机构：

[1] Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1990年 / 73卷 / 06期

关键词：

creep; grain boundaries; liquid phase; plasticity; yttria‐stabilized tetragonal zirconia polycrystals;

D O I：

10.1111/j.1151-2916.1990.tb09806.x

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：

A small addition of CuO to 2‐mol%‐Y2O3‐stabilized tetragonal zirconia polycrystals significantly enhances superplasticity by forming an amorhous grain‐boundary phase containing primarily Cu+, Y3+, Zr4+, and O2−. This phase apparently melts at around 1130°C, but it already provides a fast diffusion path even below the melting temperature. There are abrupt changes in stress exponent, activation energy, and grain size exponent across the melting temperature. Superplasticity is diffusion‐controlled below the melting temperature and is interfaced‐controlled above that. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：1626 / 1632

页数：7

共 40 条

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