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The Effect of Bulk Boron Level on its Segregation to Grain Boundaries in Substoichiometric Ni3Al

Published online by Cambridge University Press:  26 February 2011

Ashok Choudhury ,
C.L. White  and
C.R. Brooks
Ashok Choudhury
Affiliation:
Div. of Mat. Sci. & Engr., Dept. Of Mech. Engr. Univ. Of California, Davis, CA 95616
C.L. White
Affiliation:
Department Of Metallurgical Engineering, Michigan Technological University, Houghton, MI 49931
C.R. Brooks
Affiliation:
Materials Science and Engineering Department, The University Of Tennessee, Knoxville, TN 37996-2200
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Abstract

It is well established that the grain boundary strength (and thus the ductility) of polycrystalline Ni3Al is a function of the level of boron segregated to su h boundaries. This paper presents some Auger Electron Spectroscopy (AES) results obtained as part of an extensive investigation into the details of this segregation behavior. Specifically, the level of segregated boron was obtained in three substoichiometric alloys containing 0.048, 0.24 and 0.48 at.% (100, 500 and 1000 wppm, respectively) boron in the bulk. This level was correlated with the accruing fracture morphology for samples subjected to widely different thermal histories. Using McLean's approach, these segregant levels were used to arrive at the effective binding energy of boron to such boundaries. The observed trend of decreasing effective binding energy with increasing bulk boron level is more consistent with a “spectrum of binding energies” model of grain boundary segregation than with the single binding energy model of McLean.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 261
Copyright
Copyright © Materials Research Society 1988

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References

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