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Synthesis, microstructure and mechanical properties of (Ti,Mo)Al/Al2O3 in situ composites by reactive hot pressing

Published online by Cambridge University Press:  27 February 2017

Jianfeng Zhu ,
Haijun Peng  and
Fen Wang
Jianfeng Zhu
Affiliation:
School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi’an 710021, People’s Republic of China
Haijun Peng*
Affiliation:
School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi’an 710021, People’s Republic of China
Fen Wang
Affiliation:
School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi’an 710021, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: penghj15114810593@163.com
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Abstract

(Ti,Mo)Al/Al2O3 composites were successfully synthesized utilizing in situ reactive hot pressing method with Ti, Al, and MoO3 powders as starting materials. A possible synthesis mechanism was proposed to explain the formation of (Ti,Mo)Al/Al2O3 composites. The investigation results indicate a probable reaction process that molten Al reacted with MoO3 to form Al2O3 and Mo, and the TiAl matrix grains were refined increasingly by Al2O3 with the addition of MoO3 increased, accompanying with a small quantity of Mo containing phase AlMoTi2 formed in the fabricated composites. Meanwhile, the microstructure and mechanical properties of the (Ti,Mo)Al/Al2O3 composites were characterized. The as-synthesized composites exhibited lamellar structure of TiAl intermetallic compound and the in situ formed fine Al2O3 particles dispersed at the stratified TiAl matrix grain boundaries hindering the growth of the grain size of the matrix. And the Rockwell hardness, flexural strength, and fracture toughness of the as-prepared (Ti,Mo)Al/Al2O3 composite were 44.08 HRC, 684 MPa, 7.63 MPa·m1/2, which improved by 57.4%, 107.3%, and 38.7% compared to monolithic TiAl, respectively. The reinforcing mechanism of the material was also discussed.

Keywords

microstructuremechanical propertiescompositeAl2O3stratified structure
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 6 , 28 March 2017 , pp. 1129 - 1137
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

REFERENCES

Liu, D., Li, X., Su, Y., Guo, J., and Fu, H.: Microstructure evolution in directionally solidified Ti–(50,52) at.% Al alloys. Intermetallics 19(2), 175 (2011).Google Scholar
Palm, M., Engberding, N., Stein, F., Kelm, K., and Irsen, S.: Phases and evolution of microstructures in Ti–60 at.% Al. Acta Mater. 60(8), 3559 (2012).Google Scholar
Liu, X.W., Zhang, Z.L., Sun, R., Liu, F.C., Fan, Z.T., and Niu, H.Z.: Microstructure and mechanical properties of beta TiAl alloys elaborated by spark plasma sintering. Intermetallics 55(31), 177 (2014).CrossRefGoogle Scholar
Shiue, R.K., Wu, S.K., and Chen, S.Y.: Infrared brazing of TiAl intermetallic using pure silver. Intermetallics 12(7), 929 (2004).CrossRefGoogle Scholar
Li, Y.L., He, P., and Feng, J.C.: Interface structure and mechanical properties of the TiAl/42CrMo steel joint vacuum brazed with Ag–Cu/Ti/Ag–Cu filler metal. Scr. Mater. 55(2), 171 (2006).Google Scholar
Tetsui, T.: Effects of brazing filler on properties of brazed joints between TiAl and metallic materials. Intermetallics 9(3), 253 (2001).Google Scholar
Yamaguchi, M., Inui, H., and Ito, K.: High-temperature structural intermetallics. Acta Mater. 48(1), 307 (2000).Google Scholar
Wu, X.H.: Review of alloy and process development of TiAl alloys. Intermetallics 14(10–11), 1114 (2006).Google Scholar
Zhang, S.Z., Zhang, C.J., Du, Z.X., Hou, Z.P., Lin, P., and Chen, Y.Y.: Microstructure and tensile properties of hot forged high Nb containing TiAl based alloy with initial near lamellar microstructure. Mater. Sci. Eng., A 642, 16 (2015).Google Scholar
Song, X.G., Cao, J., Wang, Y.F., and Feng, J.C.: Effect of Si3N4-particles addition in Ag–Cu–Ti filler alloy on Si3N4/TiAl brazed joint. Mater. Sci. Eng., A 528(15), 5135 (2011).Google Scholar
Hu, L.F., Chen, D.M., Meng, Q.S., and Zhang, H.: Microstructure characterization and mechanical properties of (TiC–TiB2)–Ni/TiAl/Ti functionally gradient materials prepared by FAPAS. J. Alloys Compd. 636, 298 (2015).CrossRefGoogle Scholar
Horvitz, D., Gotman, I., Gutmanas, E.Y., and Claussen, N.: In situ processing of dense Al2O3–Ti aluminide interpenetrating phase composites. J. Eur. Ceram. Soc. 22(6), 947 (2002).CrossRefGoogle Scholar
Yeh, C.L. and Li, R.F.: Formation of TiAl–Ti5Si3 and TiAl–Al2O3 in situ composites by combustion synthesis. Intermetallics 16(1), 64 (2008).Google Scholar
Alman, D.E.: Reactive sintering of TiAl–Ti5Si3 in situ composites. Intermetallics 13(6), 572 (2005).CrossRefGoogle Scholar
Rao, K.P. and Vyas, A.: Comparison of titanium silicide and carbide reinforced in situ synthesized TiAl composites and their mechanical properties. Intermetallics 19(8), 1236 (2011).CrossRefGoogle Scholar
Wu, Y. and Hwang, S.K.: Microstructural refinement and improvement of mechanical properties and oxidation resistance in EPM TiAl-based intermetallics with yttrium addition. Acta Mater. 50(6), 1479 (2002).Google Scholar
Zhu, J.F., Yang, W.W., Yang, H.B., and Wang, F.: Effect of Nb2O5 on the microstructure and mechanical properties of TiAl based composites produced by hot pressing. Mater. Sci. Eng., A 528(21), 6642 (2011).CrossRefGoogle Scholar
Wang, J., Zhao, N.Q., Nash, P., Liu, E., He, C.N., Shi, C.S., and Li, J.J.: In situ synthesis of Ti2AlC–Al2O3/TiAl composite by vacuum sintering mechanically alloyed TiAl powder coated with CNTs. J. Alloys Compd. 578, 481 (2013).Google Scholar
Lindahl, P., Guatafson, P., Rolander, U., Stals, L., and Andrén, H-O.: Microstructure of model cermets with high Mo or W content. Int. J. Refract. Met. Hard Mater. 17(6), 411 (1999).Google Scholar
Li, Y., Liu, N., Zhang, X.B., and Rong, C.L.: Effect of Mo addition on the microstructure and mechanical properties of ultra-fine grade TiC–TiN–WC–Mo2C–Co cermets. Int. J. Refract. Met. Hard Mater. 26(3), 190 (2008).CrossRefGoogle Scholar
Liu, N., Xu, Y.D., Li, Z.H., Chen, M.H., Li, G.H., and Zhang, L.D.: Influence of molybdenum addition on the microstructure and mechanical properties of TiC-based cermets with nano-TiN modification. Ceram. Int. 29(8), 919 (2003).CrossRefGoogle Scholar
Clementi, E., Raimondi, D.L., and Reinhardt, W.P.: Atomic screening constants from SCF functions. II. Atoms with 37 to 86 electrons. J. Chem. Phys. 47(4), 1300 (1967).Google Scholar
Niu, G.B., Wang, D.P., Yang, Z.W., and Wang, Y.: Microstructure and mechanical properties of Al2O3/TiAl joints brazed with B powders reinforced Ag–Cu–Ti based composite fillers. Ceram. Int. 43, 439 (2016).Google Scholar
Li, A.B., Cui, X.P., Wang, G.S., Qu, W., Li, F., Zhang, X.X., Gan, W.C., Geng, L., and Meng, S.H.: Fabrication of in situ Ti5Si3/TiAl composites with controlled quasi-network architecture using reactive infiltration. Mater. Lett. 185, 351 (2016).Google Scholar
Peng, L.M., Li, Z., Li, H., Wang, J.H., and Gong, M.: Microstructural characterization and mechanical properties of TiAl–Al2Ti4C2–Al2O3–TiC in situ composites by hot-press-aided reaction synthesis. J. Alloys Compd. 414(1), 100 (2006).CrossRefGoogle Scholar
Zhu, T. and Li, J.: Ultra-strength materials. Prog. Mater. Sci. 55(7), 710 (2010).Google Scholar
Choi, S-M., Honda, S., Nishikawa, T., Awaji, H., Gnanam, F.D., Vishista, K., and Kuroyama, T.: Design concept of strengthening and toughening mechanisms in nanocomposites. J. Ceram. Soc. Jpn. 112(5), s912 (2004).Google Scholar
Meng, F.L., Zhou, Y.C., and Wang, J.Y.: Strengthening Ti2AlC by substituting Ti with V. Scr. Mater. 53(12), 1369 (2005).Google Scholar
Zhu, J.F. and Pan, R.J.: Synthesis and mechanical properties of (Ti,Mo)2AlC/Al2O3 composite by a reaction hot pressing method. Ceram. Int. 39(5), 5609 (2013).Google Scholar
Wu, Q.L., Yang, C.D., Xue, F., and Sun, Y.S.: Effect of Mo addition on the microstructure and wear resistance of in situ TiC/Al composite. Mater. Des. 32(10), 4999 (2011).CrossRefGoogle Scholar
Humenik, M. and Parikh, N.M.: Cermets: I. Fundamental concepts related to microstructure and physical properties of cermet systems. J. Am. Ceram. Soc. 39(2), 60 (1956).CrossRefGoogle Scholar
Liu, Y. and Ning, X.S.: Influence of α-Al2O3 (0001) surface reconstruction on wettability of Al/Al2O3 interface: A first-principle study. Comput. Mater. Sci. 85(85), 193 (2014).Google Scholar
Sun, H.F., Li, X.W., Feng, J., and Fang, W.B.: Characterization of TiAl-based alloy with high-content Nb by powder metallurgy. Trans. Nonferrous. Met. Soc. China 22(Suppl. 2), s491 (2012).Google Scholar