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Phase Stability and Role of Ternary Additions on Electronic and Mechanical Properties of Aluminum Intermetallics*

Published online by Cambridge University Press:  26 February 2011

A.J. Freeman ,
T. Hong ,
W. Lin  and
Jian-Hua Xu
A.J. Freeman
Affiliation:
Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208
T. Hong
Affiliation:
Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208
W. Lin
Affiliation:
Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208
Jian-Hua Xu
Affiliation:
Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208 Shanghai Institute of Metallurgy, Academy Science of China, Shanghai 200050, China
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Abstract

First principles total energy local density method have addressed the problems of (i) bonding, cohesion and phase stability and (ii) the role of ternary additions, anti-phase boundaries (APB's) and other faults in determining the structural, electronic and mechanical properties of aluminum intermetallic alloys. A key goal has been to attempt to understand, at the electronic level, fundamental quantities that may be related to the crucial brittleness vs. ductility issue in high temperature Ni and Ti and other aluminides. Other contrasts between observed ductility properties of related systems (e.g., NiAl and RuAl) are related to their differing electronic and bonding properties, particularly the nature of p-d hybridization and the directional properties of their electronic charge distrubutions - especially for states near the Fermi energy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 3
Copyright
Copyright © Materials Research Society 1991

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Footnotes

*

Work supported by the Air Force Office of Scientific Research (grant Nos. 88–0346 and F49620–88-C-0052).

References

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