Activation Energy in Hot Forming of Selected Fe-40at.%Al Type Intermetallic Compounds

• Authors: I. Schindler , R. Kawulok , H. Kulveitová , P. Kratochvíl , V. Šíma , M. Knapiński
• Languages of publication: EN

Abstracts

EN

Promising potential of the Fe-40at.%Al type alloys is used only in a limited way as yet, mainly due to their high brittleness. With regard to attraction of the given type material, the plastometric research at temperatures 800C to 1200C was carried out as a basic one, namely using the uniaxial compression tests at strain rates 10^{-2} s^{-1} to 10^1 s^{-1}. Cylindrical samples were manufactured from laboratory castings, gained by means of the vacuum induction furnace. Two materials were tested - Fe-40Al and Fe-40Al+TiB_2. From the measured flow stress curves the values of maximum stress were obtained and used for determination of the activation energy in hot forming according to the classical equation of the hyperbolic sine type. Enumeration of its parameters led to a possibility to predict maximum deformation resistance values of the investigated alloys in dependence on temperature and strain rate. Pronounced effect of the added titanium diboride particles (< 10 μm) on the activation energy value and to a resistance to the formation of cracks was observed. Thanks to the obtained value of activation energy an equation sufficiently describing the initiation of dynamic recrystallization process in the Fe-40Al+TiB_2 material as a function of the Zener-Hollomon parameter could be derived.

Keywords

EN

81.05.Bx; 81.70.-q; 81.10.Jt

Discipline

• 81.10.Jt: Growth from solid phases (including multiphase diffusion and recrystallization)
• 81.05.Bx: Metals, semimetals, and alloys
• 81.70.-q: Methods of materials testing and analysis(see also 82.80.-d Chemical analysis and related physical methods of analysis)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 3
• Pages: 610-613

Dates

published

2012-09

Contributors

author

I. Schindler

• Faculty of Metallurgy and Materials Engineering, VŠB - Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava, Czech Republic

author

R. Kawulok

• Faculty of Metallurgy and Materials Engineering, VŠB - Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava, Czech Republic

author

H. Kulveitová

• Faculty of Metallurgy and Materials Engineering, VŠB - Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava, Czech Republic

author

P. Kratochvíl

• Department of Physics of Materials, Charles University in Prague, Ke Karlovu 5, 121 16 Prague, Czech Republic

author

V. Šíma

• Department of Physics of Materials, Charles University in Prague, Ke Karlovu 5, 121 16 Prague, Czech Republic

author

M. Knapiński

• Faculty of Materials Processing Technology and Applied Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland

References

• [1] S.C. Deevi, V.K. Sikka, Nickel Iron Aluminides 4, 357 (1996)
• [2] I. Schindler, M. Šula, Application for the patent PV 2008-301, Czech Patent and Trademark Office, 2008
• [3] I. Schindler, P. Kratochvíl, P. Prokopčáková, P. Kozelský, Intermetallics 18, 745 (2010)
• [4] I. Schindler, K. Konečná, H. Kulveitová, J. Kopeček, M. Jarošová, P. Hanus, V. Šíma, M. Cagala, P. Kozelský, M. Legerski, P. Kawulok, S. Rusz, V. Šumšal, Hutnické Listy 63, 26 (2010)
• [5] D.L. Lin, D.Q. Li, Y. Liu, Intermetallics 6, 243 (1998)
• [6] R. Lyszkowski, J. Bystrzycki, T. Plocinski, Intermetallic 18, 1344 (2010)
• [7] C.M. Sellars, W.J. McTegard, Int. Metallurg. Rev. 17, 1 (1972)
• [8] C.M. Sellars, W.J. McTegard, Acta Metall. 14, 1136 (1966)
• [9] I. Schindler, I. Schindler, J. Plura, M. Heger, J. Bořuta, E. Hadasik, J. Dänemark, in: 12th Int. Conf. Forming 2005, VSB-TUO, Ostrava, 2005, p. 145
• [10] C. Zener, J.H. Hollomon, J. Appl. Phys. 15, 22 (1944)
• [11] Y.V.R.K. Prasad, D.H. Sastry, R.S. Sundar, S.C. Deevi, in: 3rd Int. Symp. on Structural Intermetallics, Ed. K.J. Hemker, The Minerals, Metals and Materials Society, Warrendale 2001, p. 233
• [12] D.Q. Li, D.L. Lin, T.L. Lin, Trans. Nonfer. Met. Soc. China 7, 16 (1997)
• [13] M. Kupka, Intermetallics 12, 295 (2004)
• [14] M. Eggersmann, B. Sepiot, G. Vogl, H. Mehrer, Def. Diff. Forum 339, 143 (1997)
• [15] Y.C. Lin, M.S. Chen, J. Zhong, Computat. Mater. Sci. 42, 470 (2008)
• [16] D. Lin, L. Lin, A. Shan, M. Chen, Intermetallics 4, 489 (1996)
• [17] A. Fraczkiewicz, A.S. Gay, M. Biscondi, Mater. Sci. Eng. A 258, 108 (1998)
• [18] C. Rossard, in: Third Int. Conf. on Strength of Metals and Alloys, Vol. II, Institute of Metals and Steel Institute, London 1973, p. 175
• [19] T. Sakai, J.J. Jonas, Acta Mater. 32, 189 (1984)

Identifiers

DOI

10.12693/APhysPolA.122.610