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The effect of scandium on the phase stability of Al sub 3 Nb and Al sub 3 Zr [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1990.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (12 pages) : digital, PDF file
Additional Creators
Oak Ridge National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
A series of Al-25 (Nb,Sc), at. %, and Al-25 (Zr,Sc), at. %, alloy buttons were arc-cast in argon and homogenized for 2 h in vacuum at temperatures ranging from 1473 to 1573K. X-ray powder-diffraction indicated that almost all the Nb in Al-25 Nb (DO₂₂) had to be replaced by Sc in order to obtain the L1₂ structure. In the case of Al₃Zr much less Sc was required -- the single phase L1₂ composition is approximately Al-16Zr-8Sc. Recent calculations show that once the tetragonality is properly included in the phase stability of the Tri-Aluminide transition-metal binary alloys can be understood in terms of their electronic density of states. The dominating feature is a deep minimum in the density of states just below the major transition metal d-band peak. The exact position of the minimum changes with structure type (i.e., L1₂, DO₂₂, or DO₂₃, and with c/a). The alignment of the Fermi energy with the minimum appears to determine the equilibrium structure. The results of linearized-muffin-tin-orbital (LMTO) electronic structure calculations are compared to the rigid band model and checked against the experimentally determined phase boundaries. 5 refs., 5 figs., 1 tab.
Report Numbers
E 1.99:conf-900466-92
conf-900466-92
Subject(s)
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Note
Published through SciTech Connect.
01/01/1990.
"conf-900466-92"
"DE91002657"
Spring meeting of the Materials Research Society, San Francisco, CA (USA), 16-21 Apr 1990.
Nicholson, D.M.; Schneibel, J.H.; Sterne, P.; Shelton, W.A.; Temmerman, W.M.
Funding Information
AC05-84OR21400
View MARC record | catkey: 14064937