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Influence of Dislocation Mobility on Room and High Temperature Ductility of <100>-Oriented Nial Single Crystals

Published online by Cambridge University Press:  22 February 2011

M. A. Morris ,
J. P. Perez  and
R. Darolia
M. A. Morris
Affiliation:
Institute of Structural Metallurgy, University of Neuchâtel, Av. Bellevaux 51, 2000 Neuchâtel, SWITZERLAND.
J. P. Perez
Affiliation:
Institute of Structural Metallurgy, University of Neuchâtel, Av. Bellevaux 51, 2000 Neuchâtel, SWITZERLAND.
R. Darolia
Affiliation:
General Electric Aircraft Engines, Cincinnati, Ohio 45215, USA.
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Abstract

The dislocation configurations produced by room and high temperature compression of <100> oriented single crystals of binary NiAl and in those containing iron and hafnium additions have been analysed and compared to those obtained by hardness indentation and TEM insitu tensile tests. Kinking occurs during room temperature compression such that <100> dislocations are activated in all cases but the iron-containing alloy also exhibited a large density of <111> screw dislocations. The latter however, appear immobile when they are created by hardness indentations of thin foils, while only pile-ups of <100> segments can propagate. Similarly, although different slip systems are present after high temperature compression, only <100> dislocation segments have been confirmed to be mobile after room temperature hardness indentation of these predeformed thin foils. The improvement in ductility observed at room temperature in the predeformed specimens of the binary and the iron containing alloys has been attributed to the increased production of these mobile <100> dislocations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 413
Copyright
Copyright © Materials Research Society 1995

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