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首页> 外文期刊>Materials Science and Engineering >Mechanism of failure in a free-standing Pt-aluminide bond coat during tensile testing at room temperature
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Mechanism of failure in a free-standing Pt-aluminide bond coat during tensile testing at room temperature

机译：室温下拉伸试验中自支撑的Pt-铝化物粘合涂层的失效机理

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摘要

The room temperature (RT) tensile behaviour of a free-standing high activity Pt-aluminide bond coat has been evaluated by microtensile testing technique. The coating had a typical three-layer microstructure. The stress-strain plot for the free-standing coating was linear, indicating the coating to be brittle at RT. Different fracture features were observed across the coating layers, namely quasi-cleavage in the outer layer and inner interdiffusion zone, and cleavage in the intermediate layer. By employing interrupted tensile test and observing the cross-sectional microstructure of the tested specimens, it was determined that failure of the microtensile samples occurred by the initiation of a single crack in the intermediate layer of the coating and its subsequent inside-out propagation. Such a mechanism of failure has been explained in terms of the fracture features observed across the sample thickness. This mechanism of failure is consistent with fracture toughness values of the individual coating layers.
机译：独立的高活性铂铝化物粘合涂层的室温（RT）拉伸性能已通过微拉伸试验技术进行了评估。涂层具有典型的三层微结构。独立涂层的应力-应变图是线性的，表明涂层在室温下是脆性的。在整个涂层上观察到不同的断裂特征，即在外层和内部互扩散区中的准解理，以及在中间层中的解理。通过采用间断的拉伸试验并观察被测样品的横截面显微结构，可以确定，由于在涂层的中间层中出现了单个裂纹并随后发生了由内而外的传播，从而导致了微拉伸样品的失效。已经通过在整个样品厚度上观察到的断裂特征来解释了这种失效机理。这种破坏机理与各个涂层的断裂韧性值一致。

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