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Observations of Orientation Dependent Creep of Ni3AI

Published online by Cambridge University Press:  10 February 2011

Carola Knobloch ,
Karin Glock  and
Uwe Glatzel
Carola Knobloch
Affiliation:
TU Berlin, Inst. f. Metallische Werkstoffe, BH 18, D-10623 Berlin, Germany
Karin Glock
Affiliation:
Universität Jena, Metallische Werkstoffe, D-07743 Jena, Germany, [email protected]
Uwe Glatzel
Affiliation:
Universität Jena, Metallische Werkstoffe, D-07743 Jena, Germany, [email protected]
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Abstract

The influence of crystal orientation on the high temperature creep behavior of Ni3(Al Ti Ta) was investigated by tensile creep testing under a constant load at a temperature of 1123K. The single crystals were oriented close to [001], [011], [111], [557] and [012]. The results show an increasing stationary creep rate from [111] over [011] to [001]. The evolution of the microstructure during creep deformation was studied, using transmission electron microscopy (TEM). Only few systems are active in the primary regime, whereas several slip systems operate in the secondary stage. Habit planes of dislocation pairs separated by an antiphase boundary were examined and compared with anisotropic elastic calculations, explaining the good creep response of [111] oriented single crystals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK9.11.1
Copyright
Copyright © Materials Research Society 1999

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References

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