| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1468805 | Corrosion Science | 2014 | 6 Pages |
•The stability of amorphous oxide is different depending on the alloy composition.•The stability of amorphous oxide in Al88Ni7Ca5 is higher than that in Al82Ni13Zr5.•The presence of calcium ion in oxide stabilizes amorphous structure of the oxide.
Formation and thermal stability of amorphous oxide in Al82Ni13Zr5 and Al88Ni7Ca5 alloys during holding at 873 K have been investigated. The thickness of amorphous oxide layer upon heating up to 873 K is ∼8 nm in Al82Ni13Zr5, while ∼15 nm in Al88Ni7Ca5. After exposure for 15 h, the amorphous oxide still remains in Al88Ni7Ca5, indicating that the thermal stability of the amorphous oxide in Al88Ni7Ca5 is higher than that in Al82Ni13Zr5. Such a phenomenon is discussed from the points of view of structural stability and oxygen ion mobility in the crystalline and amorphous oxide phases.
