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首页> 美国政府科技报告 >Microstructurally Developed Toughening Mechanisms in Ceramics. Stress-Induced Phase Transformations: Theory of Phase Retention and Fracture Toughness
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Microstructurally Developed Toughening Mechanisms in Ceramics. Stress-Induced Phase Transformations: Theory of Phase Retention and Fracture Toughness

机译：微观结构发展陶瓷增韧机理。应力诱导的相变：相保持理论和断裂韧性

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The thermodynamics of a constrained transformation has been examined with regard to the conditions for phase retension during fabrication and the effect of a stress-induced transformation on the fracture toughness. Constraint of the shape change associated with the transformation by an elastic matrix will lower the transformation temperature. Retention also requires that a critical grain size (or particle size) cannot be exceeded during fabrication. Two binding solutions for the critical stress intensity factor (Kc) were obtained: one for the case where the transformation suffers no stress hysteresis effect and the other for a large stress hysteresis effect. Both indicate that Kc will depend on the transformation's shape change, the elastic properties of the constraining matrix, the volume fraction of the retained, metastable phase and temperature. Kc is predicted to decrease with increasing temperature. (Author)

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