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The Nb-Ti-Si ternary phase diagram: Evaluation of liquid- solid phase equilibria in Nb-and Ti-rich alloys

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Journal of Phase Equilibria

Abstract

Phase equilibria in ternary Nb-Ti-Si alloys have been investigated using scanning electron micros-copy, XRD, and electron beam microprobe analysis. Alloys containing up to four phases, Nb(Ti) 5 Si 3 , Ti(Nb) 5 Si 3 , (Nb,Ti) 3 Si, and (Nb,Ti,Si) were directionally solidified using cold crucible Czochralski crystal growth. A broad range of Nb and Ti compositions were investigated for Si concentrations up to 35.0%. Microstructural and microchemical evidence provided a clear definition of the Nb-Ti-Si liquidus surface and indicate that the metal-rich end of the ternary phase diagram possesses two transition reactions: L + Nb(Ti) 5 Si 3 → (Nb,Ti) 3 Si + Ti(Nb) 5 Si 3 L + (Nb,Ti) 3 Si → (Nb,Ti,Si) + Ti(Nb) 5 Si 3 The first of these transition reactions occurs at a composition of approximately Nb-66Ti-19Si, and probably at a temperature between 1600 and 1650 ‡C. The second of these transition reactions oc-curs at a composition of approximately Nb-76Ti-13.5Si and a temperature of approximately 1350 ‡C. No ternary eutectic was observed in the compositions that were investigated.

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Authors and Affiliations

  1. General Electric Company, Corporate Research and Development, 12301, Schenectady, New York

    B. P. Bewlay & M. R. Jackson

  2. Department of Mechanical and Materials Engineering, Wright State university, 45435, Dayton, Ohio

    H. A. Lipsitt

Authors
  1. B. P. Bewlay
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  2. M. R. Jackson
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  3. H. A. Lipsitt
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Bewlay, B.P., Jackson, M.R. & Lipsitt, H.A. The Nb-Ti-Si ternary phase diagram: Evaluation of liquid- solid phase equilibria in Nb-and Ti-rich alloys. JPE 18, 264–278 (1997). https://doi.org/10.1007/BF02647850

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  • DOI: https://doi.org/10.1007/BF02647850

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