Residual stresses and transformation toughening in MoSi2, composites reinforced with partially stabilized zirconia

被引：14
|
作者：
Lu, GY [1 ]
Lederich, R [1 ]
Soboyejo, W [1 ]
机构：
[1] MCDONNELL DOUGLAS CORP, ST LOUIS, MO 63134 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1996年 / 210卷 / 1-2期
关键词：
transformation; toughening; residual stress; molybdenum disilicide;
D O I：
10.1016/0921-5093(95)10075-X
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The results of study of the effects of yttria stabilization (0-6 mol.%) on the room-temperature fracture behavior and toughening mechanisms in zirconia-reinforced MoSi2 are presented in this paper. Transformation toughening is shown to occur only in composites reinforced with zirconia particles stabilized with 2 mol.% yttria. However, the fracture toughness levels are comparable in the other composites with yttria levels between 0 and 6 mol.%. Toughening in the other composites is attributed to the combined effects of residual stress, microcrack shielding/anti-shielding and/or crack deflection. A rigorous micromechanics-based model is presented for the estimation of residual stress levels in brittle materials reinforced with phases that can transform during cooling or under stress. The model is applied successfully to the rationalization of the observed fracture and toughening phenomena.
引用
收藏
页码：25 / 41
页数：17
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