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The Effect of Ion-Implanted Elements on the θ to α Phase Transformation of Al2O3 Scales Grown on β-NiAl

Published online by Cambridge University Press:  01 January 1992

B. A. Pint ,
A. Jain  and
L. W. Hobbs
B. A. Pint
Affiliation:
H. H. Uhlig Corrosion Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139
A. Jain
Affiliation:
ITMMEC, Indian Institute of Technology, Delhi 110016, India
L. W. Hobbs
Affiliation:
H. H. Uhlig Corrosion Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

During oxidation at 1000°C in dry, flowing O2, β-NiAl first forms an oxide scale of primarily θ-Al2O3. After 1-4 hr of continued exposure this metastable oxide transforms into the stable α-Al2O3 structure. An implant of 2 × 1016Y/ cm2 at 70kV was found to stabilize the first- forming θ- Al203 scale up to 100hr at 1000°C. β-NiAl was also implanted with Al and Cr to study the effect of the implantation damage and of another more noble element on the oxidation behavior. At 1200°C, only a short term effect of the Y-implant was observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 1013
Copyright
Copyright © Materials Research Society 1995

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References

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