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Effect of Off-Stoichiometry on the Deformation Behavior of Ni3AI Binary Polycrystals

Published online by Cambridge University Press:  10 February 2011

B. Matterstock ,
E. Conforto ,
T. Kruml ,
J. Bonneville  and
J. L. Martin
B. Matterstock
Affiliation:
Ecole Polytechnique Fédérale Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne (Switzerland).
E. Conforto
Affiliation:
Ecole Polytechnique Fédérale Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne (Switzerland).
T. Kruml
Affiliation:
IPM, Zizkova 22, 616 62 Brno, Czech Republic
J. Bonneville
Affiliation:
Ecole Polytechnique Fédérale Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne (Switzerland).
J. L. Martin
Affiliation:
Ecole Polytechnique Fédérale Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne (Switzerland).
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Abstract

Polycrystals of binary Ni3Al with different compositions are deformed in compression between 300K and 1300K. They exhibit a strength anomaly with peak temperatures between 800K and 950K. Below the peak, the aluminium rich compounds are the strongest ones while the nickel rich compounds are the weakest ones. As the aluminium content increases, the complex stacking fault energy, measured through weak beam experiments, increases as well. This confirms the cross slip mechanism of mobile dislocation exhaustion through Kear-Wilsdorf lock formation. A ‘ductile-to-brittle transition’ is observed at 1000K. Fracture occurs along grain boundaries, the strength of which decreases as environmental effects are enhanced at high temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK10.3.1
Copyright
Copyright © Materials Research Society 1999

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References

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