Quantitative assessment of pore development at Al2O3/FeAl interfaces during high temperature oxidation

Conference · Tue Apr 24 04:00:00 EDT 2001

OSTI ID:789151

Hou, Peggy Y ^[1]; Van Leiden, C; Niu, Y; Gesmundo, F

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1. LBNL Library

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 National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director, Office of Science. Office of Basic Energy Studies. Division of Materials Sciences (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 789151
• Report Number(s): LBNL--47685
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
INTERFACES
IRON BASE ALLOYS
OXIDATION
PORE STRUCTURE
VACANCIES