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Effect of interstitial concentration and heat treatment on microstructure and primary creep of investment cast Ti-47Al-2Nb-2Mn with 0.8v% TiB2

Published online by Cambridge University Press:  15 February 2011

Dong Yi Seo ,
T. R. Bieler  and
D. E. Larsen
Dong Yi Seo
Affiliation:
Dept. of Materials Science and Mechanics, Michigan State University, East Lansing, MI 48824.
T. R. Bieler
Affiliation:
Dept. of Materials Science and Mechanics, Michigan State University, East Lansing, MI 48824.
D. E. Larsen
Affiliation:
Howmet Corp. 1500 S. Warner St., Whitehall, MI 49461.
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Abstract

Most research about creep has focused on minimum creep rate or stress rupture properties, but primary creep is important for practical applications. In this paper, we compare how interstitial content and heat treatments of shorter duration than used in past studies affect the microstructure and primary creep resistance of a particular alloy containing TiB2 particles. More time and temperature in heat treatment homogenizes the microstructure and reduces the scatter of creep times to 0.5% strain. Increasing interstitial content increases the time to 0.5% creep, and it stabilizes the a2 phase. Preliminary evidence for large mechanical twinning strains parallel to lamellar interfaces shortly following loading is provided.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 281
Copyright
Copyright © Materials Research Society 1997

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References

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