Microstructure Control of Co3AlC-Base Heat Resistant Alloys Using Optical Floating Zone Melting

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Aiming for further improvement of mechanical properties of Co3AlC-based heat resistant alloys, microstructure control was conducted using optical floating zone (OFZ) melting. Unidirectional solidification was performed to align Co3AlC/a(Co) two-phase eutectic microstructure. Co3AlC single phase poly-crystal alloys were successfully fabricated for the first time by taking advantage of OFZ. Mechanical properties were evaluated for selected alloys by compression tests at ambient temperature, 1073 K and 1273 K. Excellent elevated temperature strength is achieved in Co3AlC single phase alloys and ductility is sufficiently improved in Co3AlC/a(Co) two-phase alloys.

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Periodical:

Materials Science Forum (Volumes 475-479)

Main Theme:

Edited by:

Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie

Pages:

833-836

Citation:

Y. Kimura et al., "Microstructure Control of Co3AlC-Base Heat Resistant Alloys Using Optical Floating Zone Melting", Materials Science Forum, Vols. 475-479, pp. 833-836, 2005

Online since:

January 2005

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$38.00

[1] H. Nowotny and F. Benesovsky: Phase Stability in Metals and Alloys, eds. R. S. Rudman, (McGraw Hill, New York 1967), p.319.

[2] H. H. Stadelmaier: Developments in the Structural Chemistry of Alloy Phases, ed. B. C. Giessen, (Plenum Press, New York 1969), p.141.

[3] H. Hosoda, M. Takahashi, T. Suzuki and Y. Mishima: High-Temperature Ordered Intermetallic Alloys VI, MRS Symp Proc. Vol. 288(1993), p.793, (Mater. Res. Soc., Pittsburgh).

[4] H. Hosoda: Doctor thesis, Tokyo Institute of Technology, (1993).

[5] Y. Kimura: Doctor thesis, Tokyo Institute of Technology, (1994).

[6] Y. Kimura, M. Takahashi, S. Miura, T. Suzuki and Y. Mishima: Intermetallics Vol. 3 (1995), p.413.

[7] Y. Kimura, M. Takahashi, H. Hosoda, S. Miura, Y. Mishima: Intermetallics Vol. 8 (2000), p.749.

[8] Y. Kimura, C. T. Liu and Y. Mishima: Intermetallics Vol. 9 (2001), p.1069.

[9] Y. Kimura, K. Iida and Y. Mishima: High-Temperature Ordered Intermetallic Alloys VI, MRS Symp Proc. Vol. 753(2003), p.433, (Mater. Res. Soc., Pittsburgh). Fig. 3 Temperature dependence of compressive 0. 2% flow stress of Co3AlC-base alloys.

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