Interfacial segregation, pore formation and scale adhesion on NiAlalloys
Journal Article
·
· Oxidation of Metals
OSTI ID:886826
Alloys of commercial grades that do not contain a reactive element, such as yttrium, often develop pores at the scale/alloy interface. The accumulation and growth of these pores greatly weaken scale adhesion. The purpose of this study is to evaluate pore development in Fe-40at%Al and determine the change in pore volume with oxidation time. Experimental results are then compared to a theoretical calculation where all vacancies are allowed to condense as voids. After removing the oxide scales that formed after various times of oxidation at 1000 C in oxygen, the alloy surface was analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM) to determine the size and depth of interfacial pores. Results are discussed in light of possible mechanisms involved in pore formation at scale/alloy interfaces.
- Research Organization:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of BasicEnergySciences
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 886826
- Report Number(s):
- LBNL--55446; BnR: KC0201030
- Journal Information:
- Oxidation of Metals, Journal Name: Oxidation of Metals Vol. 63; ISSN OXMEAF; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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