BRITTLE FRACTURE OF ALUMINA BELOW 1000 DEGREES C

被引:21
作者
CONGLETO.J
PETCH, NJ
SHIELS, SA
机构
[1] Department of Metallurgy, University of Newcastle upon Tyne
来源
PHILOSOPHICAL MAGAZINE | 1969年 / 19卷 / 160期
关键词
D O I
10.1080/14786436908216334
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Alumina is normally regarded as truly brittle below ∼ 1000°C. Contrary to this view, it is argued that plastic deformation at the crack tip plays a necessary part in the fracture. This is used to explain the minimum observed at 250°C in the fracture stress of polycrystalline plates containing drilled cracks and in the stress intensity required for crack-branching. Other details of the fracture of single crystal and polycrystalline alumina, including changes in the proportion of intergranular and transgranular fracture with temperature, crack length and crack-branching, are also explained by the involvement of plastic deformation. © 1969 Taylor & Francis Group, LLC.
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页码:795 / &
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