Journal
SCRIPTA MATERIALIA
Volume 56, Issue 5, Pages 385-388Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2006.10.039
Keywords
cobalt alloys; intermetallic compounds; high temperature deformation; dislocations; stacking faults
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The high-temperature strength of new cobalt-base alloys reinforced with a high volume fraction of a Co-3(Al,W) ternary L1(2) intermetallic compound has been examined. The flow stress exhibits a strong, positive dependence on temperature above 873 K and the strength of a Co-Al-W-Ta quaternary alloy is comparable to that of nickel-base superalloys at 1173 K. The flow anomaly is attributed to the activation of multiple slip modes within the precipitates. Above the peak flow temperature, < 112 > dislocation shearing of precipitates is the dominant deformation mode. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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