Formation and thermal stability of amorphous oxide in Al82Ni13Zr5 and Al88Ni7Ca5 alloys during holding at 873K have been investigated. The thickness of amorphous oxide layer upon heating up to 873K is ~8nm in Al82Ni13Zr5, while ~15nm in Al88Ni7Ca5. After exposure for 15h, 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.
Bibliographical noteFunding Information:
This work was supported by the Global Research Laboratory Program of the Korean Ministry of Education, Science and Technology.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Science(all)