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Localized Oxidation Near Cracks and Lamellar Boundaries in a Gamma Titanium Aluminide Alloy

Published online by Cambridge University Press:  22 February 2011

J. Kameda ,
C. R. Gold ,
E. S. Lee ,
T. E. Bloomer  and
M. Yamaguchi
J. Kameda
Affiliation:
Arnes Laboratory, Metallurgy and Ceramics Division, Ames, IA 50011
C. R. Gold
Affiliation:
Arnes Laboratory, Metallurgy and Ceramics Division, Ames, IA 50011
E. S. Lee
Affiliation:
Arnes Laboratory, Metallurgy and Ceramics Division, Ames, IA 50011
T. E. Bloomer
Affiliation:
Arnes Laboratory, Metallurgy and Ceramics Division, Ames, IA 50011
M. Yamaguchi
Affiliation:
Kyoto University, Department of Metal Science and Technology, Kyoto 606, Japan
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Abstract

Small punch (SP) tests on single grained titanium aluminide (Ti-48 at.%Al) specimens with 12° and 80° lamellar orientations with respect to the tensile stress axis were conducted at 1123 K in air. Brittle cracks readily extended through the thickness in the 80° lamellar structure. In a SP specimen with the 12° lamellar structure load-interrupted at the strain of 0.43%, surface cracks with the depth of 15–25 μm were formed along lamellar boundaries. Local oxidation behavior on partly sputtered surfaces in the load-interrupted 12° lamellar specimen was examined using scanning Auger microprobe (SAM). Oxygen enriched regions were observed near cracks and some lamellar layers. The mechanisms of high temperature oxygen-induced cracking are discussed in terms of the local oxidation near cracks and lamellar boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1297
Copyright
Copyright © Materials Research Society 1995

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