Abstract
The present paper describes the effect of Hf and Ti additions on the microstructures and mechanical properties of two-phase composites based on the Cr2Nb–Nb eutectic. The microstructures of directionally solidified in situ composites containing 50–70% by volume of the Laves phase Cr2Nb which was modified with Hf (7.5–9.2%) and Ti (16.5–26%) are described. Partitioning of Hf and Ti between the two phases is discussed using microprobe and EDS results. The tensile properties at 1100 and 1200 °C are described and compared with those of an analogous niobium silicide-based composite. The Cr2(Nb)–(Nb) composite tensile yield strengths at 1200 °C were increased over that of monolithic Cr2Nb to ∼130 MPa. However, at 1200 °C the yield strengths of the silicide-based composites were approximately twice those of the Cr2(Nb)–(Nb) composites.
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References
D. L. Anton and D. M. Shah, Mater. Sci. Eng. A153, 410–415 (1992).
D. L. Anton and D. M. Shah, in High-Temperature Ordered Intermetallic Alloys IV, edited by L. A. Johnson, D. A. Pope, and J. O. Stiegler (Mater. Res. Soc. Symp. Proc. 213, Pittsburgh, PA, 1991), pp. 733–738.
H. J. Goldschmidt and J. A. Brand, J. Less-Comm. Met. 3, 44–61 (1961).
R. L Fleischer, C. L. Briant, and R. D. Field, in High-Temperature Ordered Intermetallic Alloys IV, edited by L. A. Johnson, D.A. Pope, and J. O. Stiegler (Mater. Res. Soc. Symp. Proc. 213, Pittsburgh, PA, 1991), pp. 463–474.
B. P. Bewlay, J. A. Sutliff, M. R. Jackson, and H.A. Lipsitt, Acta Metall. Mater. 42 (8), 2869–2878 (1994).
B. P. Bewlay, H. A. Lipsitt, M. R. Jackson, W. J. Reeder, and J. A. Sutliff, Mater. Sci. Eng. A192/193, 534–543 (1995).
M. Takeyama and C.T. Liu, Mater. Sci. Eng. A132, 61–66 (1991).
T. Takasugi, S. Hanada, and K. Miyamoto, J. Mater. Res. 8, 3069–3077 (1993).
M. R. Jackson and K. D. Jones, in Refractory Metals Extraction, Processing and Applications, edited by K. C. Liddell, D.R. Sadoway, and R. G. Bautista (TMS Publications, Warrendale, PA, 1991), pp. 310–320.
B. P. Bewlay and M. R. Jackson unpublished.
M. R. Jackson, D. W. Skelly, and R. G. Rowe Annual Reports, WRDC Contract #F33615-91-C-5613 (1994, 1995).
M. Venkatraman and J. P. Neumann, Bull. Alloy Phase Diagrams 7 (5), 462–466 (1986).
D.J. Thoma and J. H. Perepezko, in Intermetallic Matrix Composites, edited by D. L. Anton, P. L. Martin, D. B. Miracle, and R. McMeeking (Mater. Res. Soc. Symp. Proc. 194, Pittsburgh, PA, 1990), pp. 105–112.
D.J. Thoma and J. H. Perepezko, Mater. Sci. Eng. A156, 97–108 (1992).
T. B. Massalski, Binary Alloy Phase Diagrams (ASM INTERNATIONAL, Materials Park, OH, 1991).
D. L. Davidson and K.S. Chan, AFOSR Final Report (April 1995).
K. S. Kumar and D. B. Miracle, Intermetallics 2, 257–274 (1994).
K.S. Ravichandran, D. B. Miracle, and M. G. Mendiratta, in Intermetallic Matrix Composites III, edited by J. A. Graves, R. R. Bowman, and J.J. Lewandowski (Mater. Res. Soc. Symp. Proc. 350, Pittsburgh, PA, 1994), pp. 249–254.
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Bewlay, B.P., Jackson, M.R. The effect of Hf and Ti additions on microstructure and properties of Cr2Nb–Nb in situ composites. Journal of Materials Research 11, 1917–1922 (1996). https://doi.org/10.1557/JMR.1996.0242
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DOI: https://doi.org/10.1557/JMR.1996.0242