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Creep of Anomalous Ni3Ga

Published online by Cambridge University Press:  15 February 2011

M J Lunt  and
Y Q Sun
M J Lunt
Affiliation:
University of Oxford, UK, [email protected]
Y Q Sun
Affiliation:
University of Oxford and Wright Laboratory, Dayton, Ohio
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Abstract

Ni3Ga is among a number of LI2 ordered intermetallic alloys whose yield stress increases with temperature. In this work we have examined the creep strength of [123] and [001] oriented Ni3Ga specimens in the temperature regime of the yield stress anomaly and confirmed that the creep strength shows the normal rapid decrease with temperature. Inverse creep occurs in the [001] specimens where slip is on the {111} planes only. [123] specimens exhibit steady-state creep and slip line and TEM observations have shown slip on the cube plane and dislocations of both <110> and <100> Burgers vectors are present. We have carried out creep tests of prestrained [123] samples and demonstrated that the storage of primary <110> {111} screw dislocations, locked in the Kear-Wilsdorf configuration, has no effect on creep.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 629
Copyright
Copyright © Materials Research Society 1997

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References

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