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COMPRESSION CREEP BEHAVIOR OF B2 AL-NI-RU TERNARY ALLOYS

Published online by Cambridge University Press:  26 February 2011

Fang Cao  and
Tresa M. Pollock
Fang Cao
Affiliation:
fcao@umich.edu, University of Michigan, Materials Science and Engineering, 3062 H.H.Dow Bldg, 2300 Hayward St., Ann Arbor, MI, 48109, United States, 734-615-5164, 734-615-5168
Tresa M. Pollock
Affiliation:
tresap@engin.umich.edu, University of Michigan, Materials Science and Engineering, 2300 Hayward St., Ann Arbor, MI, 48109, United States
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Abstract

The compression creep behavior of five Al- Ni-Ru ternary alloys with compositions across the NiAl-RuAl B2 phase field has been investigated within the temperature range of 950 °C to 1050 °C. A continuous increase of the melting temperature and creep resistance with increasing Ru/Ni ratio in these alloys was observed. Post-creep dislocation analyses identified the presence of <100> and <110> edge dislocations in the Al-deficient alloys. Conversely, jogged <100> screw dislocations predominated in the Ru-rich ternary alloys. Dislocation substructures and transient experiments suggest a transition of the creep mechanism from viscous glide controlled to jogged screw motion in these alloys.

Keywords

dislocationstransmission electron microscopy (TEM)Ru
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II01-10
Copyright
Copyright © Materials Research Society 2007

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