Abstract
Natural grown ZrO2 cannot effectively protect Zr alloy due to the poor phase stability. In this work, a pre-defected ZrO2 coating was fabricated on Zr alloy and further bombarded by Ar8+. A spontaneous martensitic transformation in ZrO2 coating was triggered by lattice distortion and gradient mismatch on the interface. Additionally, Ar8+ bombardment induced the formation of interstitial-vacancy pairs in ZrO2. DFT modeling proved that the interstitial-vacancy pairs were superior in stabilizing T-phase ZrO2, compared with native oxygen vacancies. A mechanism for enhanced corrosion resistance was proposed based on the unique interface and defect state.
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