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The Location of Tantalum Atoms in Ni3Al

Published online by Cambridge University Press:  26 February 2011

Hui Lin  and
David P. Pope
Hui Lin
Affiliation:
Dept. of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104
David P. Pope
Affiliation:
Dept. of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104
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Abstract

An X-ray powder diffraction method was used to determine the location of tantalum atoms in Ni3Al. A series of Ni3 (Al,Ta) alloys were produced with tantalum content ranging from 0.1 to 3.0 at%. Fine powders with average particle sizes less than 80 pm were made from melt-spun ribbons by a grinding process. The values of the superlattice peak intensities normalized to the intensity of the (200) fundamental peak agreed with the calculated values assuming that tantalum atoms substitute on aluminum sites, not on nickel sites. Thus it is concluded from our experiments that tantalum atoms substitute for aluminum in Ni3Al, except for Ta contents around 0.2 at% where the data can not be interpreted in terms of a simple substitution scheme.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 475
Copyright
Copyright © Materials Research Society 1989

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References

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