High Temperature Microstructural Stability of Si3N4 in TiAl Alloys

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Alloys of Ti-50 at.% Al with (3 and 10)wt.% Si3N4 particles were prepared by a mechanical alloying-spark plasma sintering (MA-SPS) method. The matrix consisted primarily of TiAl, Ti2AlN, TiN. Si3N4 was unstable in the matrix and started to decompose forming a Ti5Si3 reaction layer on the surface of former Si3N4 particles during sintering and heat treatment at 1373 K.

Info:

Periodical:

Materials Science Forum (Volumes 534-536)

Edited by:

Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim

Pages:

1577-1580

Citation:

J. H. Choi and D. B. Lee, "High Temperature Microstructural Stability of Si3N4 in TiAl Alloys", Materials Science Forum, Vols. 534-536, pp. 1577-1580, 2007

Online since:

January 2007

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$38.00

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[46] 11(Ti+N) + 45. 18(Al) + 8. 71(O).

[4] [42] 94(Ti+N) + 40. 62(Al) + 10. 96(O) + 5. 48(Si).

[3] [59] 21(Ti+N) + 20. 74(Al) + 11. 95(O) + 8. 10(Si).

[2] [91] 98(Si) + 5. 69(Ti+N) + 1. 21(O) + 1. 12(Al).

[1] Concentration ( at% ) Position.

[46] 11(Ti+N) + 45. 18(Al) + 8. 71(O).

[4] [42] 94(Ti+N) + 40. 62(Al) + 10. 96(O) + 5. 48(Si).

[3] [59] 21(Ti+N) + 20. 74(Al) + 11. 95(O) + 8. 10(Si).

[2] [91] 98(Si) + 5. 69(Ti+N) + 1. 21(O) + 1. 12(Al).

[1] Concentration ( at% ) Position (b).

[45] 29(Ti+N) + 29. 51(Al) + 23. 16(O) + 2. 04(Si).

[3] [39] 75(Al) + 36. 09(Ti+N) + 22. 97(O) + 1. 19(Si).

[2] [73] 95(Si) + 17. 21(O) + 8. 84(Al).

[1] Concentration ( at% ) Position.

[45] 29(Ti+N) + 29. 51(Al) + 23. 16(O) + 2. 04(Si).

[3] [39] 75(Al) + 36. 09(Ti+N) + 22. 97(O) + 1. 19(Si).

[2] [73] 95(Si) + 17. 21(O) + 8. 84(Al).

[1] Concentration ( at% ) Position (b) 1 2 3 4 (a) 10㎛ 2 1 3 (a) 10㎛.

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