TiAl에 석출한 질화물의 결정구조와 형태

한창석; 구경완; Chang-Suk Han; Kyung-Wan Koo

Korean Journal of Materials Research, Vol.18, No.1, 51-56, January, 2008

DOI10.3740/MRSK.2008.18.1.051 Export Citation

TiAl에 석출한 질화물의 결정구조와 형태

Crystal Structure and Morphology of Nitride Precipitates in TiAl

한창석^†, 구경완

호서대학교 국방과학기술학과

Chang-Suk Han^†, and Kyung-Wan Koo

Dept. of Defense Science & Technology, Hoseo University, 165 Sechul-Ri, Baebang-Myun, Asan City, Chungnam 336-795, KOREA, Korea

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The crystal structures and morphologies of precipitates in L10-ordered TiAl intermetallics containing nitrogen were investigated by transmission electron microscopy (TEM). Under aging at an approximate temperature of 1073 K after quenching from 1423 K, TiAl hardens appreciably due to the nitride precipitation. TEM observations revealed that needle-like precipitates, which lie only in one direction parallel to the [001] axis of the L10-TiAl matrix, appear in the matrix preferentially at the dislocations. Selected area electron diffraction (SAED) pattern analyses showed that the needle-shaped precipitate is perovskite-type Ti3AlN (Pphase). The orientation relationship between the P-phase and the L10-TiAl matrix was found to be (001)P//(001)TiAl and [010]P//[010]TiAl. By aging at higher temperatures or for longer periods at 1073 K, plate-like precipitates of Ti2AlN (H-phase) with a hexagonal structure formed on the {111} planes of the L10-TiAl matrix. The orientation relationship between the Ti2AlN and the L10-TiAl matrix is (0001)H//(111)TiAl and H//TiAl.

Keywords:intermetallic compound;TiAl;precipitation;perovskite

[References]

Song SH, Kim SH, Hong YH, Oh MH, Wee DM, Met. Mater. Int., 10, 307 (2004)
Van Thyne RJ, Kessier HD, Trans. AIME, 196, 213 (1954)
Schuster JC, Nowotny H, Vaccaro C, J. Solid State Chem., 32, 213 (1980)
Schuster JC, Bauer J, J. Solid State Chem., 53, 260 (1984)
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Mabuchi H, Morimoto H, Kakitsuji A, Tsuda H, Matsui T, Morii K, Scripta materialia, 44, 2503 (2001)
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Loiseau A, Lasalmonie A, Mat. Sci. Eng., 67, 163 (1984)
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Kawabata T, Tadano M, Izumi O, ISIJ International, 31, 1161 (1991)
Vujic D, Li Z, Whang SH, Met. Trans., 19A, 2445 (1988)
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Loomis WT, Freeman JW, Sponseller DL, Met. Trans., 3, 989 (1972)

[Referenced By]

[1] Song SH, Kim SH, Hong YH, Oh MH, Wee DM, Met. Mater. Int., 10, 307 (2004)

[2] Van Thyne RJ, Kessier HD, Trans. AIME, 196, 213 (1954)

[3] Schuster JC, Nowotny H, Vaccaro C, J. Solid State Chem., 32, 213 (1980)

[4] Schuster JC, Bauer J, J. Solid State Chem., 53, 260 (1984)

[5] Hayes FH, Ternary Alloys, Ed. Petzow G, Effenberg G, Weinheim, 7, 557 (1992)

[6] Zakharov A, Ternary Alloys, Ed. Petzow G, Effenberg G, VCH, Weinheim, 7, 305 (1992). (1992)

[7] Mabuchi H, Morimoto H, Kakitsuji A, Tsuda H, Matsui T, Morii K, Scripta materialia, 44, 2503 (2001)

[8] Kaufman MJ, Konitzer DG, Shull RD, Fraser HL, Scr. Metall. Mater., 20, 103 (1986)

[9] Loiseau A, Lasalmonie A, Mat. Sci. Eng., 67, 163 (1984)

[10] Loiseau A, Lasalmonie A, Acta Cryst. B, 39, 580 (1983)

[11] Kawabata T, Tadano M, Izumi O, ISIJ International, 31, 1161 (1991)

[12] Vujic D, Li Z, Whang SH, Met. Trans., 19A, 2445 (1988)

[13] Kelly A, Nicholson RB, Progress in Materials Science, Ed. B. Chamers, 10, 149 (1963)

[14] Von Hornbogen E, Roth M, Metalkde Z., 58, 842 (1967). (1967)

[15] Loomis WT, Freeman JW, Sponseller DL, Met. Trans., 3, 989 (1972)