Ti₂AlC/TiAl Matrix Intermetallic Compound Prepared by In Situ Hot Pressing

Abstract:

As the new structural material, TiAl intermetallic compound has great potential application in aerospace engine, energy and automotive fields. But the bottleneck problems including poor room temperature ductility and high-temperature oxidation resistance limit its application. Ti₂AlC possesses an unusual combination of the merits of both metals and ceramics, which is considered the best reinforcement for TiAl intermetallic compound. In the present work, Ti₂AlC/TiAl matrix intermetallic compound was successfully fabricated by in situ hot pressing method from the mixture of Ti/Al/TiC. The phase transitions were investigated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The microstructure of the product was studied by scanning electron microscopy (SEM). Ti reacted with Al liquids to form Ti-Al intermetallics below 900 °C firstly. With increasing temperature (above 900 °C), a part of TiAl intermetallics reacted with TiC to form Ti₂AlC reinforcement. The as-sintered product presented dense and typical lamellar structure. The in-situ synthesized fine Ti₂AlC contributed to improve the strength of TiAl matrix intermetallic compound.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 515-518
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.515
• Online since: March 2014
• Authors: Tao Tao Ai*, Fen Wang, Chen Hui Yang
• Keywords: Hot-Pressing, Intermetallic, Microstructure, Ti₂AlC, TiAl

References

[1] S.L. Shu, F. Qiu, B. Xing, S.B. Jin, Y.W. Wang, Q.C. Jiang, Study of effect of Mn addition on the mechanical properties of Ti2AlC/TiAl composites through first principles study and experimental investigation, Intermetallics 28 (2012) 65-70.

DOI: 10.1016/j.intermet.2012.03.053

[2] Fritz Appel, Jonathan D.H. Paul, Michael Oehring, Gamma Titanium Aluminide Alloys: Science and Technology, John Wiley & Sons Inc, (2011).

DOI: 10.1002/9783527636204

[3] Y.G. Zhang, Y.F. Han, G.L. Chen, J.T. Guo, X.J. Wan, D. Feng, Structural Intermetallics National Defence Industry Press, Beijing, (2001).

[4] Y. -W. Kim, Ordered intermetallic alloys, part III: Gamma titanium aluminides, JOM 46 (1994) 30-39.

DOI: 10.1007/bf03220745

[5] F. Yang, F.T. Kong, Y.Y. Chen, S.L. Xiao, Effect of spark plasma sintering temperature on the microstructure and mechanical properties of a Ti2AlC/TiAl composite, J. Alloy. Compd. 496 (2010) 462-466.

DOI: 10.1016/j.jallcom.2010.02.077

[6] T.T. Ai, Microstructures and mechanical properties of in-situ Al2O3/TiAl composites by exothermic dispersion method, Acta Metall. Sin. (English Letters) 21 (2008) 437-443.

DOI: 10.1016/s1006-7191(09)60006-5

[7] M.L. VanMeter, S.L. Kampe, L. Christodoulou, Mechanical properties of near-γ titanium aluminides reinforced with high volume percentages of TiB2, Scripta Mater. 34 (1996) 1251-1256.

DOI: 10.1016/1359-6462(95)00671-0

[8] C.L. Yeh, R.F. Shen, Formation of TiAl-Ti5Si3 and TiAl-Al2O3 in situ composites by combustion synthesis, Intermetallics 16 (2008) 64-70.

DOI: 10.1016/j.intermet.2007.07.016

[9] J.F. Zhu, W.W. Yang, Y.P. Gong, Fabrication of TiAl/Ti2AlC composite by reaction hot pressing, Applied Mechanics and Materials 52-54 (2011) 842-845.

DOI: 10.4028/www.scientific.net/amm.52-54.842

[10] M.W. Barsoum, The Mn+1AXn phases: a new class of solids; thermodynamically stable nanolaminates, Prog. Solid State Ch. 28 (2000) 201-281.

DOI: 10.1016/s0079-6786(00)00006-6

[11] X.H. Wang, Y.C. Zhou, Layered machinable and electrically of conductive Ti2AlC and Ti3AlC2 ceramics: a review, J. Mater. Sci. Technol. 26 (2010) 385-416.

DOI: 10.1016/s1005-0302(10)60064-3

[12] S.L. Shu, F. Qiu, S.J. Lü, S.B. Jin, Q.C. Jiang, Phase transitions and compression properties of Ti2AlC/TiAl composites fabricated by combustion synthesis reaction, Mat. Sci. Eng. A 539 (2012) 344-348.

DOI: 10.1016/j.msea.2012.01.108

[13] T.T. Ai, F. Wang, Thermodynamic analysis and synthetic reaction process of Ti-Al-TiO2 composite, Heat Treatment of Metals (in Chinese), 34 (2009)  85-89.

[14] M. Yamaguchi, Y. Umarkoshi, The deformation behavior of intermetallic superlattice compounds, Prog. Mater. Sci. 34 (1990) 1-148.

[15] K.S. Chan, Toughening mechanisms in titanium aluminides, Metall. Trans. A 24 (1993) 569-582.

[16] K.S. Chan, Y.M. Kim, Relationships of slip morphology, microcracking, and fracture resistance in a lamellar TiAl-alloy, Metall. Mater. Trans. A 259 (1994) 1217-1228.

DOI: 10.1007/bf02652296

[17] C.S. Kwai, S.S. Donald, Fatigue and fracture behavior of a fine-grained lamellar TiAl alloy, Metall. Mater. Trans. A 28 (1997) 79-89.

DOI: 10.1007/s11661-997-0084-8