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<111> Slip in Nial Single Crystals Between 4.2K and 100K

Published online by Cambridge University Press:  22 February 2011

Y. Q. Sun ,
G. Taylor ,
R. Darolia  and
P. M. Hazzledine
Y. Q. Sun
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.
G. Taylor
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.
R. Darolia
Affiliation:
Engineering Materials Technology Laboratories, GE Aircraft Engines, 1 Newman Way, Cincinnati, Ohio 45215, USA.
P. M. Hazzledine
Affiliation:
UES Inc., Materials Research Division, Dayton-Xenia Road, Dayton, OH 45432, USA.
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Abstract

Slip in <111> directions is a deformation mode found in many intermetallic compounds ordered into the B2 (CsCl) structure, but in NiAl it is active only under the limiting conditions of uniaxial loading along <100> and low testing temperatures. This paper investigates the deformation characteristics of <100> oriented NiAl tested between 4.2K and 300K. Compression tests have shown that below about 100K, deformation takes place by slip in <111> directions without kinking, whereas between 100K and 300K kinking in the form of shearing on {100} becomes the dominant mode of plastic deformation, occurring usually near one or both ends of the compression samples. The yield stress has been found to exhibit a normal decrease with temperature, but at a rate that is smaller than most bcc metals. The sensitivity of the flow stress to strain-rate changes is also characteristically small, giving activation volumes around b3, b being the Burgers vector of a<111> superdislocation. Both slip line observations and transmission electron microscopy have shown slip mainly on {110} near 80K, but with increasing activity on {112} and cross-slip between {110} and {112} with the lowering of temperature to 4.2K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 261
Copyright
Copyright © Materials Research Society 1995

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