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采用声发射技术原位检测稀土元素改性HP40合金经过不同氧化时间后,氧化膜在降温过程中的剥落行为。结果表明,添加稀土元素的合金经过1h预氧化后氧化膜结合强度并未得到明显提高。随着氧化时间的延长,稀土元素促进合金的内氧化,进而提高了氧化膜与基体界面结合强度。通过BSE观察发现,稀土元素促进氧化膜与基体界面内氧化产物(氧化硅)的形成。同时这种氧化硅提高了氧化膜结合强度,进而改变了氧化膜的剥落形式。
Acoustic emission technique was used to in situ detect the exfoliation behavior of the oxide film during the cooling process after the different oxidation time of HP40 alloy modified by rare earth elements. The results show that the adhesion strength of the oxide film after 1h pre-oxidation has not been significantly improved. With the extension of the oxidation time, rare earth elements promote the internal oxidation of the alloy, thereby improving the bonding strength between the oxide film and the substrate. The observation by BSE found that rare earth elements promote the formation of oxidation products (silicon oxide) in the interface between oxide film and matrix. At the same time, the silicon oxide improves the bonding strength of the oxide film, thereby changing the exfoliation pattern of the oxide film.