THE HOT HARDNESS TESTING FOR SUPERPLASTICITY IN NANOCRYSTALLINE YTTRIA-STABILIZED TETRAGONAL ZIRCONIA

被引：12
|
作者：
PRABHU, GB
BOURELL, DL
机构：
[1] Center for Materials Science, Engineering The University of Texas at Austin, Austin
来源：
SCRIPTA METALLURGICA ET MATERIALIA | 1995年 / 33卷 / 05期
关键词：
D O I：
10.1016/0956-716X(95)00275-Z
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Yttria Stabilized Tetragonal Zirconia (YSTZ) (3 mol% Yttria) was synthesized by a sol-gel chloride route. YSTZ sintered to > 99% theoretical density at temperatures above 1225 °C. This was used as starting material to perform hot hardness measurements. The hot indentation technique was used as a quick and convenient method to obtain preliminary information on the high temperature deformation characteristics of zirconia. Vickers micro-hardness measurements were carried out in the temperature range from room temperature to 1250 °C. Indentation size was in the range 25 to 250 μm. The temperature for the onset of superplasticity was determined to be about 1100 °C from a plot of hardness against temperature. The activation energy for superplastic deformation was determined to be approximately 550 kJ mol. © 1995.
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页码：761 / 766
页数：6
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