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通过断口观察研究了几种非平衡组织对N5单晶TLP扩散焊接头断裂机理的影响。结果表明,大尺寸化合物是接头在应力状态下的敏感区,增加了接头有效连接面积的平均应力,宏观上则表现为接头力学性能的降低;共晶组织各相弹性模量存在差异,高温持久应力状态下沿相界面易产生脆性断裂;接头中存在第二相粒子时,高温持久断裂和高温拉伸断裂的原始裂纹在第二相粒子处萌生。
The effect of several non-equilibrium structures on the fracture mechanism of N5 single crystal TLP diffusion bonded joints was investigated by fracture observation. The results show that the large size compounds are the sensitive area of the joint in stress state, which increases the average stress of the effective joint area of the joint, and decreases the mechanical properties of the joint macroscopically. The elastic modulus of each phase of the eutectic structure is different, The brittle fracture easily occurs along the phase interface under the stress state. When the second phase particles exist in the joint, the original cracks at the high temperature permanent fracture and the high temperature tensile fracture initiate at the second phase particles.