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Porous Ti–Al Intermetallic Based Alloys Fabricated by Pressure-Sintering Elemental Powders with a Space Holder Powder

  • Naoki Takata (a1), Keisuke Uematsu (a1) and Makoto Kobashi (a1)
Abstract

In the present study, we have attempted to produce the porous Ti–Al intermetallic based alloys by pressure-sintering of the elemental powders of Ti and Al through a combustion reaction, with a NaCl space holder to achieve the development of a highly porous structure. The powders of Ti (particle size: <45 μm) and Al (particle size: <45 μm) were mixed to various total compositions of Ti–0-40 Al (at.%), and NaCl (particle size: 300-400 μm) was mixed with the Ti/Al powder to give a highly porous structure. The mixed powder was sintered at 700 oC under a constant pressure of 30 MPa to form cylindrical specimens with a diameter of 20 mm. The soaking of the specimens in pure water allows for the removal of NaCl (with a volume fraction of 60 %) and the formation of the pores to achieve a controlled relative density of 0.4. The present process can produce porous Ti–Al alloys with various compositions. In as-sintered Ti–Al specimens, an inhomogeneous microstructure consisting of Ti particles surrounded by the a Ti–Al alloy layer (various Ti–Al intermetallic phases) was observed. The as-sintered specimens exhibited the brittle behavior under compression, which is independent of their Al content. However, in a Ti–20Al alloy heat-treated at 1300 °C, a nearly Ti3Al single-phase microstructure appeared in the porous specimen. The heat-treated porous Ti–20Al alloy shows both a high plateau-strength level of approximately 100 MPa and a high plateau-end strain over 50%, resulting in a high absorption energy. The present results demonstrate that controlling the microstructure for the formation of the Ti3Al single-phase would be an effective method to achieve high energy absorption capacity of the porous Ti–Al alloy.

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*(Email: takata@numse.nagoya-u.ac.jp)
References
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1. Ashby, M. F., Evans, A., Fleck, N. A., Hutchinson, J. W., Wadley, H.N.G., Metals Foams : A Design Guide, Elsevier Science (2000).
2. Banhart, J., Prog. Mater. Sci. 46, 559 (2001).
3. Lefebvre, L.-P., Banhart, J. and Dunand, D., Adv. Eng. Mater. 10, 775 (2008).
4. Banhart, J., Adv. Eng. Mater. 15, 82 (2013) .
5. Koza, E., Leonowicz, M., Wojciechowski, S., Simancik, F., Mater. Let. 58, 132 (2003).
6. Kanetake, N., Kobashi, M., Journal of The Japan Institute of Light Metals 62, 122 (2012).
7. Lasalmonie, A., Intermetallics, 14 1123 (2006).
8. Wu, X., Intermetallics 14 1114 (2006).
9. Gaillard, C., Despois, J. F., Mortensen, A., Mater. Sci. Eng. A 374, 250 (2004).
10. Torres, Y., Pavon, J. J., Rodriguez, J. A., J Mater. Proc. Tech. 212, 1061 (2012).
11. Wenjuan, N., Chenguang, B., GuiBao, Q., Qiang, W., Mater. Sci. Eng. A 506, 148 (2009).
12. Kobashi, M., Miyake, S., Kanetake, N., Intermetallics 42, 32 (2013).
13. Kobashi, M., Inoguchi, N., Kanetake, N., Intermetallics 18, 1039 (2010).
14. Arakawa, Y., Kobashi, M., Kanetake, N., Intermetallics 41, 22 (2013).
15. Mansourighasri, A., Muhamad, N., Sulong, A.B., J. Mater. Proc. Tech. 212, 83 (2012).
16. Liu, Y., Li, S., Hou, W., Wang, S., Hao, Y., Yang, R., Sercombe, T. B., Zhang, L.-C., J. Mater. Sci. Tech. 32, 505 (2016).
17. Jha, N., Mondal, D.P., Majumdar, J. D, Badkul, A., Jha, A.K., Khare, A.K., Materials and Design 47, 810 (2013).
18. Lipsitt, H. A., Shechtman, D. S., Schafrik, R. E., Metall. Trans. A 11, 1369 (1980).
19. Inui, H., Toda, Y., Shirai, Y., Yamaguchi, M., Philos. Mag. A 69, 1161(1994).
20. Minonishi, Y., Philos. Mag. A 63, 1085 (1991).
21. Umakoshi, Y., Nakano, T., Ogawa, B., Scr. Mater. 34, 1161 (1996).
22. Naruse, W., Kondo, S., Kobashi, M., Kanetake, N., Iwata, Y., Nishiwaki, T., Journal of The Japan Institute of Light Metals 64, 598 (2014).
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MRS Advances
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