Electron concentration and phase stability in NbCr2-based Laves phase alloys

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Phase stability in NbCr{sub 2}-based transition-metal Laves phases was studied, based on the data reported for 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, is the dominating factor in controlling the phase stability of NbCr{sub 2}-based transition-metal Laves phases. The e/a ratios for different Laves polytypes were determined as followed: 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 is stabilized again. A further ... continued below

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25 p.

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Zhu, J.H.; Liaw, P.K. & Liu, C.T. May 12, 1997.

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  • Zhu, J.H.
  • Liaw, P.K. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  • Liu, C.T. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

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Description

Phase stability in NbCr{sub 2}-based transition-metal Laves phases was studied, based on the data reported for 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, is the dominating factor in controlling the phase stability of NbCr{sub 2}-based transition-metal Laves phases. The e/a ratios for different Laves polytypes were determined as followed: 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 is 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 Mg-based Laves phases and transition-metal A{sub 3}B intermetallic compounds is also reviewed and compared with the present observations in transition-metal Laves phases. In order to verify the e/a/phase stability relationship experimentally, additions of Cu (with e/a = 11) were selected to replace Cr in the NbCr{sub 2} Laves phase. Experimental results for the ternary Nb-Cr-Cu system are reported and discussed in terms of the correlation between the e/a ratio and phase stability in NbCr{sub 2}-based Laves phases. A new phase was found, which has an average composition of Nb-47Cr-3Cu. Within the solubility limit, the electron concentration and phase stability relationship is obeyed in the Nb-Cr-Cu system.

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25 p.

Notes

OSTI as DE98003793

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  • Other Information: PBD: 12 May 1997

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  • Other: DE98003793
  • Report No.: ORNL/Sub--93-SP173/02
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/629468 | External Link
  • Office of Scientific & Technical Information Report Number: 629468
  • Archival Resource Key: ark:/67531/metadc694996

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Creation Date

  • May 12, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • May 2, 2016, 4:20 p.m.

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Zhu, J.H.; Liaw, P.K. & Liu, C.T. Electron concentration and phase stability in NbCr2-based Laves phase alloys, report, May 12, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc694996/: accessed November 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.