Mechanisms of intergranular cavity growth in Ni3Al (Zr,B) |
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| Affiliation: | 1. School of Environment and Manicipal Engineering, North China University of Water Resources and Electric Power, ZhengZhou, 450046, China;2. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;3. Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, College of Mechanical Engineering, Quzhou University, Quzhou, 324000, China |
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| Abstract: | A technique based on hydrogen embrittlement has been used to study the morphology and growth characteristics of grain boundary cavities in a Ni3Al alloy. The technique facilitates brittle intergranular fracture of specimens previously tested at elevated temperatures. This capability makes it possible to distinguish cavities that have formed by cavity coalescence and also determine cavity shape in three dimensions. Contrary to earlier reports of crack-like cavity growth, the results indicate that the shapes of individually growing cavities in Ni3Al are consistent with quasi-equilibrium cavity growth theory. Cavity size measurements have also been compared with predictions of both quasi-equilibrium and crack-like cavity growth models. These results also support the finding that cavity growth in Ni3Al occurs in a quasi-equilibrium manner. The observations further suggest that the formation of crack-like cavities is primarily due to coalescence and, therefore, not representative of the growth mechanism of individual cavities. |
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