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Fine Structures of the Pyramidal Slip Dislocations in Ti3Al Single Crystals at Temperatures of the Yield Stress Anomaly

Published online by Cambridge University Press:  10 February 2011

Yasuhide Minonishi
Yasuhide Minonishi*
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan, minonisi@imr.tohoku.ac.jp
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Abstract

The <1126>(1121) pyramidal slip in Ti3Al shows the so-called yield stress anomaly. A marked change in dislocation configuration is observed in the temperature range concerned; dislocations observed at the lowest temperature of the range, −70°C, are ordinary pairs of edge c+a/2 superpartial dislocations coupled by antiphase boundaries (APBs) while at the other extreme temperature 700°C, pairs of unlike superpartials coupled by APBs are observed. The change in dislocation configurations is interpreted as resulting from immobilization of edge c+a/2 superpartial segments by climb dissociation onto the basal plane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.17.1
Copyright
Copyright © Materials Research Society 1999

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References

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