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Dislocation Dynamics Studied by Mechanical Loss in a Ni3(AI, Ta) Single Crystal at Intermediate Temperatures

Published online by Cambridge University Press:  10 February 2011

B. L. Cheng ,
E. Carreño-Morelli ,
N. Baluc ,
J. Bonneville  and
R. Schaller
B. L. Cheng
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de Génie Atomique, PHB Ecublens, CH-1015 Lausanne, Switzerland
E. Carreño-Morelli
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de Génie Atomique, PHB Ecublens, CH-1015 Lausanne, Switzerland
N. Baluc
Affiliation:
Centre de Recherches en Physique des Plasmas, Technologie de la Fusion, OVGA/6, CH-5232 Villigen-PSI, Switzerland
J. Bonneville
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de Génie Atomique, PHB Ecublens, CH-1015 Lausanne, Switzerland
R. Schaller
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de Génie Atomique, PHB Ecublens, CH-1015 Lausanne, Switzerland
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Abstract

Dislocation dynamics in Ni3AI intermetallic single crystals has been studied by mechanical spectroscopy between 300 and 700 K. It has been found that in the anomaly domain of the flow stress, which is characteristic of this material, the mechanical loss of predeformed specimens is strongly dependent on strain amplitude, predeformation level, annealing temperature and time. The results can be interpreted as a combination of two phenomena which simultaneously occur as temperature is increased from 300 K to about 500 K: exhaustion of the mobile dislocation segments (superkinks) and pinning of the screw dislocation segments via cross-slip from the (111) onto the (010) planes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK5.38.1
Copyright
Copyright © Materials Research Society 1999

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References

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