Hardness and Low-Temperature Deformation of Silica Glass

被引:112
作者
Neely, J. E. [1 ]
Mackenzie, J. D. [1 ]
机构
[1] Rensselaer Polytech Inst, Div Mat, Troy, NY 12180 USA
基金
美国国家航空航天局; 美国国家科学基金会;
关键词
D O I
10.1007/BF00757906
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Vickers diamond pyramid hardness measurements have been made on silica glass with varying thermal history using loads up to 1000 g. Hardness was independent of load and source. From interference photographs and subsequent anneal of the indentations at temperatures below T(g), it was concluded that indentation leads primarily to densification of a volume of glass in the vicinity of the indenter. A portion of the densification which is recoverable at relatively low temperatures is attributed to molecular entanglement of the glassy network due to high pressure and shear. The other portion which is not recoverable below T(g) represents an approach to the final equilibrium density of the glass. Hardness of silica glass as determined by this method is thus defined as a resistance of the material to densification.
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页码:603 / 609
页数:7
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