论文部分内容阅读
Thermomechanical fatigue behavior of a nickel base single crystal superalloy TMS-82 has been investigated.It was found that the micropores in the alloy tend to initiate large amounts of deformation twins and the crack causes many twins to occur during its propagation.It is postulated that these twins around the micropores or the crack are induced by the stress eld of the micropores or the crack tip,respectively.A thermodynamic model is adopted linking the twin formation energy with the stress eld around the crack tip,which explains the observed results with good consistency.The in uencing factors for a crack to stimulate twins around it are shown by the model,which might provide possible ways to enhance the alloy’s thermomechanical fatigue performance.
Thermomechanical fatigue behavior of a nickel base single crystal superalloy TMS-82 has been investigated. It was found that the micropores in the alloy tend to large losses of twins and the cracks causes many twins to occur during its propagation. It is postulated that these twins around the micropores or the crack are induced by the stress eld of the micropores or the crack tip, respectively. A thermodynamic model is adopted linking the twin formation energy with the stress eld around the crack tip, which explains the observed results with good consistency.The in uencing factors for a crack to stimulate twins around it are shown by the model, which might provide possible ways to enhance the alloy’s thermomechanical fatigue performance.