열기계적 처리한 Ti-45.4%Al-4.8%Nb 합금의 고온산화

김재운; 이동복; Jae-Woon Kim; Dong-Bok Lee

Korean Journal of Materials Research, Vol.14, No.7, 457-461, July, 2004

DOI10.3740/MRSK.2004.14.7.457 Export Citation

열기계적 처리한 Ti-45.4%Al-4.8%Nb 합금의 고온산화

High Temperature Oxidation of Thermomechanically Treated Ti-45.4%Al-4.8%Nb Alloys

김재운, 이동복^†

성균관대학교 플라즈마응용 표면기술 연구센터

Jae-Woon Kim, and Dong-Bok Lee^†

Center for Advanced Plasma Surface Technology, Sungkyunkwan University, Suwon 440-746, South Korea

E-mail:

The thermomechanically treated Ti?45.4%Al?4.8%Nb(at%) alloy was oxidized between 800 and 1000 ? C in air, and the oxidation characteristics were studied. The dissolution of Nb in the oxide scale was observed from the TEM study. The Pt marker test revealed that the oxidation process was controlled by the outward diffusion of Ti ions and the inward diffusion of oxygen ions. During oxidation, the evaporation of Nb-oxides was found to occur to a small amount. Niobium tended to pile-up at the lower part of the oxide scale, which consisted primarily of an outer TiO 2 layer, and an intermediate Al 2 O 3 ?rich layer, and an inner mixed layer of ( TiO 2 +Al 2 O 3 ).

Keywords:Aluminide;Titanium;Niobium;Oxidation

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[1] Froes FH, Suryanarayana C, Physical Metallurgy and Processing of Intermetallic Compounds, Chapman & Hall, Inc., NY, p.297 (1996) (1996)

[2] Kim YW, J. Met., 46(7), 30 (1994)

[3] Welsch G, Kahveci AI, Oxidation of High Temperature Intermetallics, TMS, Warrendale, PA, p.207 (1989) (1989)

[4] Okafor ICI, Reddy RG, J. Met., 51(6), 35 (1999)

[5] Haanappel VAC, Clemens H, Stroosnijder MF, Intermetallics, 10, 293 (2002)

[6] Kim BG, Kim GM, Kim CJ, Scripta Metall. Mater., 33, 1117 (1995)

[7] Shida Y, Anada H, Mater. Trans., 35, 623 (1994)

[8] Yoshihara M, Miura K, Intermetallics, 3, 357 (1995)

[9] Ternary Alloys edited by Petzow G, Effenberg G, 7, 390, MSI VCH, (1993) (1993)

[10] Brady MP, Brindley WJ, Smialek JL, Locci IE, J. Met., 48(11), 46 (1996)

[11] Brady MP, Brindley WJ, Smialek JL, Locci IE, Russ. J. Inorg. Chem., 34, 741 (1989)

[12] Fedorov NF, Mel'nlkova OV, Saltykova VA, Plovovarova AP, Dib M, Strakhov VI, Russ. J. Inorg. Chem., 34, 741 (1989)