CRACK HEALING OF ALUMINA WITH A RESIDUAL GLASSY PHASE - STRENGTH, FRACTURE-TOUGHNESS AND FATIGUE

被引：23
|
作者：
CHOI, SR [1 ]
TIKARE, V [1 ]
机构：
[1] NASA,LEWIS RES CTR,CLEVELAND,OH 44135
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1993年 / 171卷 / 1-2期
关键词：
D O I：
10.1016/0921-5093(93)90394-T
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The crack-healing behavior of identation cracks and large precracks in 96 wt.% alumina was studied as a function of annealing temperature in air and inert environments. Crack healing occurred at annealing temperatures of 800-degrees-C and above in both air and inert (argon) environments, indicating its cause as transport of existing material to the crack plane, and resulted in increased strength and fracture toughness. However, the resulting phase assemblage in the crack plane was susceptible to fatigue at room temperature in distilled water, as evidenced by a somewhat low fatigue parameter of N = 68. Furthermore, polished-and-annealed samples were more susceptible to fatigue at room temperature in air than as-polished samples.
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页码：77 / 83
页数：7
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