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New configuration of a [001] superdislocation formed during high-temperature creep in the γ′ phase of a single-crystal superalloy TMS-138

Published online by Cambridge University Press:  01 March 2006

J.X. Zhang ,
H. Harada  and
Y. Koizumi
J.X. Zhang*
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
H. Harada
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Y. Koizumi
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
*
a) Address all correspondence to this author. e-mail: jian-xin.zhang@nims.go.jp
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Abstract

A new configuration of a superdislocation in the γ′ phase of a fourth-generation single-crystal TMS-138 superalloy was found after creep rupture in a [001] tensile test at 1150 °C and 137 MPa. The segments of the superdislocation lie in four directions, i.e., [110], [110], [100], and [010], strictly on a (001) plane with a Burgers vector b = [001]. This superdislocation is pure edge in character and does not dissociate into superpartials. Microstructural evidence shows that this kind of superdislocation is formed by combination of two interfacial dislocations with different Burgers vectors, i.e., 1/2[011] + 1/2[011] → [001].

Keywords

AlloyDislocationsTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 3 , March 2006 , pp. 647 - 654
Copyright
Copyright © Materials Research Society 2006

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