Effect of Si Content on the Creep Properties of Ti-6Al-4Fe-xSi Alloys

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Effect of silicon content on the creep properties of Ti-6Al-4Fe-xSi was studied. Creep resistance of Ti-6Al-4Fe-xSi alloys was superior to that of Ti-6Al-4V. Ti-6Al-4Fe-0.5Si alloy exhibited the highest rupture strength and creep resistance among the Ti-6Al-4Fe-xSi alloys investigated. The minimum creep rate of the alloys decreased with increasing silicon content up to 0.5wt.% and then it increased again when the silicon content was higher than 0.5wt.%. TiFe precipitates were formed mainly at the β phase area of Ti-6Al-4Fe-xSi alloys by consuming titanium and iron in β phase, when the alloys were thermally exposed at 500 and 600°C during the creep test. During the creep test, microvoids were induced at the TiFe/α phase interfaces and the cracks were formed along the TiFe/α phase interfaces by the coalescence of the voids. Those cracks were finally connected each other through the α phase.

Info:

Periodical:

Key Engineering Materials (Volumes 261-263)

Edited by:

Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka

Pages:

1141-1146

Citation:

J. W. Yoon et al., "Effect of Si Content on the Creep Properties of Ti-6Al-4Fe-xSi Alloys", Key Engineering Materials, Vols. 261-263, pp. 1141-1146, 2004

Online since:

April 2004

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$38.00

[1] H. W. Jeong, S. E. Kim, Y. T. Hyun and Y. T. Lee: J. Kor. Inst. Metall. & Mater., 38 (2000) 1203.

[2] H. W. Jeong, S. E. Kim, Y. T. Hyun and Y. T. Lee: J. Kor. Inst. Metall. & Mater., 39 (2001) 32.

[3] S. Amelinckx : The Direct Observation of Dislocations, Academic Press, New York, (1964), 381.

[4] B. Lu, R. Yang, Y.Y. Cui, and D. Li: Metall. & Materials. A, 31A (2000) 2205.

[5] C. Ramachandra and V. Singh: Metall Trans. A, 16A (1985) 227.

[6] D. Hoeppner : Metallography, 11(1978), 1299.

[7] S. E. Kim and Y. T. Lee: Metals and Materials, 4 (1998) 47.

[8] C. Ramachandra and V. Singh: Metall. Trans. A, 13A (1982) 771.

[9] F. C. Monkman and N. J. Grant: Proc. ASTM, 56 (1956) 593.

[10] R. L. Orr, O. D. Sherby and J. E. Dorn: Trans. ASME, 46 (1954) 113.

[11] P. Villare and L. Calvert: Pearson's Handbook of Crystallographic Data for Intermetallic Phases, 2nd edition, ASM, 4 (1991).

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