Strain determination in thermally-grown alumina scales using fluoresence spectroscopy.

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Oxid. Met.

DOI:https://doi.org/10.1007/BF02153461· OSTI ID:937960

Renusch, D; Grimsditch, M; Koshelev, I; Veal, B W; Hou, P Y; LBNL,

By exploiting the strain dependence of the ruby luminescence line, we have measured room-temperature residual strains in thermally-grown alumina scales. Measurements were made on two alloys Fe-5Cr-28Al and Fe-18Cr 10Al (at.% bal. Fe), oxidized between 300-1300 C. Significantly different levels of strain buildup were observed in scales on these alloys. Results on similar alloys containing a dilute reactive element (RE) are also presented. Scales formed on RE-containing alloys (Zr or Hf) could support significantly higher strains at T {ge} 1000C. Strain relief associated with spallation thresholds is readily observed. In early-stage oxidation, the evolution of transition phases is monitored using Raman and fluorescence spectroscopies. The fluorescence technique also provides a sensitive probe of early-stage formation of {alpha}-Al{sub 2}O{sub 3}. It appears that, in the presence of Cr2O3 or Fe2O3, the {alpha}-phase of Al{sub 2}O{sub 3} can form at anomalously low temperatures.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: ER; EPRI
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 937960
• Report Number(s): ANL/MSD/JA-24763
• Journal Information: Oxid. Met., Journal Name: Oxid. Met. Journal Issue: 5/6 ; 1997 Vol. 48; ISSN OXMEAF; ISSN 0030-770X
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
CHROMIUM ALLOYS
FLUORESCENCE SPECTROSCOPY
IRON ALLOYS
OXIDATION
RESIDUAL STRESSES
STRAINS