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Study of fatigue and fracture behavior of NbCr{sub 2}-based alloys and intermetallic materials [electronic resource] : Phase stability in NbCr{sub 2} Laves phase alloys

Published
Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1996.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
pages 491-500 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Phase stability in NbCr₂-based transition-metal Laves phases is studied in this paper, using data from binary X-Cr, Nb-X, and ternary Nb-Cr-X phase diagrams. It was shown that when the atomic size ratios are kept identical, the average electron concentration factor (e/a = the average number of electrons per atom outside the closed shells of the component atoms) is the determinate factor in controlling the phase stability of NbCr₂-based transition-metal Laves phases. The e/a ratios for different Laves phase structures were determined as follows: with e/a < 5.76, the C15 structure is stabilized; at an e/a range of 5.88-7.53, the C14 structure is stabilized; with e/a > 7.65, the C15 structure was stabilized again. A further increase in the electron concentration factor (e/a > 8) leads to the disordering of the alloy. The electron concentration effect on the phase stability of transition-metal A₃B intermetallic compounds and Mg-based Laves phases is also reviewed and compared with the present observations in transition-metal Laves phases.
Report Numbers
E 1.99:ornl/fmp--96/1
E 1.99: conf-9605167--
conf-9605167--
ornl/fmp--96/1
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Note
Published through SciTech Connect.
08/01/1996.
"ornl/fmp--96/1"
" conf-9605167--"
"DE97050349"
10. annual conference on fossil energy materials, Knoxville, TN (United States), 14-16 May 1996.
Liu, C.T.; Zhu, J.H.; Liaw, P.K.
View MARC record | catkey: 14451325