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High Temperature Strength of Co-based γ/γ' Superalloys

Published online by Cambridge University Press:  26 February 2011

Akane Suzuki ,
Garret C DeNolf  and
Tresa M Pollock
Akane Suzuki
Affiliation:
akanes@umich.edu, University of Michigan, Materials Science and Engineering, 3062 H.H.Dow, 2300 Hayward St., Ann Arbor, MI, 48109, United States, 734-763-1406, 734-615-5168
Garret C DeNolf
Affiliation:
denolfgc@umich.edu, University of Michigan, Materials Science and Engineering, 2300 Hayward St., Ann Arbor, MI, 48109, United States
Tresa M Pollock
Affiliation:
tresap@umich.edu, University of Michigan, Materials Science and Engineering, 2300 Hayward St., Ann Arbor, MI, 48109, United States
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Abstract

The high temperature strength of new Co-Al-W based alloys consisting of a ?-Co (fcc) matrix phase and a high volume fraction of ?'-Co3(Al, W) ternary L12 intermetallic compound has been examined in order to understand the strengthening mechanisms and to explore the possibility for high temperature applications. The flow stress exhibits a strong, positive dependence on temperature above 873 K. Additions of Ta improve the high temperature strength, and the strength of a Ta containing alloy is comparable to Ni-base superalloys at 1173 K. Transmission microscopy on the deformed Ta containing alloy revealed that the active slip modes within the ?' precipitates are <110>{111} and <112>{111} below and above the peak temperature, respectively. At the peak flow temperature, multiple slip modes including <110>{111}, <110>{001} and <112>{111} were observed.

Keywords

Costrengthdislocations
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II08-09
Copyright
Copyright © Materials Research Society 2007

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References

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