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Crystal structure modification of the rhombohedral Mu phase in a C-276 alloy

Published online by Cambridge University Press:  31 January 2011

Raghavan Ayer ,
J. C. Scanlon ,
M. Watkins ,
G. A. Vaughn  and
J. W. Steeds
Raghavan Ayer
Affiliation:
Corporate Research Laboratories, Exxon Research and Engineering Company, Route 22 East, Annandale, New Jersey
J. C. Scanlon
Affiliation:
Corporate Research Laboratories, Exxon Research and Engineering Company, Route 22 East, Annandale, New Jersey
M. Watkins
Affiliation:
Exxon Production Research Company, P. O. Box 2801, Houston, Texas 77001
G. A. Vaughn
Affiliation:
Exxon Production Research Company, P. O. Box 2801, Houston, Texas 77001
J. W. Steeds
Affiliation:
University of Bristol, Bristol. United Kingdom
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Abstract

A new hexagonal crystal structure modification of the rhombohedral Mu phase with A7B6 stoichiometry was observed in a cast alloy C-276. The hexagonal structure was determined to share the same lattice parameter along the a axis, while the dimension along the c axis was such that chex = 2/3crhomb. The space group of the hexagonal phase is suggested to be P 63/mmc and forms by a four-layer ABAB repeat, where A and B represent Zr4Al3 and MgCu2 structures, respectively. Details of the diffraction analysis are presented in this article.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 1 , February 1988 , pp. 8 - 15
Copyright
Copyright © Materials Research Society 1988

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References

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