Abstract
This paper describes the influence of the strain rate on plastic instabilities in some aluminium alloys. These instabilities associated with the Portevin-La Chatelier effect are investigated at room temperature. Experimental data were obtained in tensile tests with a constant crosshead speed giving a strain rate in the range of about 1.6×10−6 to 6×10−2 s−1. The critical strain for the onset of the instabilities are found to decrease with increasing strain rate. In order to explain this “inverse” or “anomalous” behaviour some tensile tests were connected with acoustic emission measurements. The observed experimental data are compared with the Kubin and Estrin model.
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References
Thomas, A.T. (1966) The tensile deformation behaviour of an Al-Mg alloy, Acta Metall. 14, 1363–1374.
Matsuura, K., Nishiyama, T., and Koda, S. (1969) Portevin-Le Chatelier effect in Al-Mg alloys, Trans. JIM 10, 429–436.
Brindley, B.J. and Worthington, P.J. (1969) Serrated yielding in Al-3%Mg, Acta Metall. 17, 13571361.
Miura, S. and Yamauchi, H. (1972) Influence of grain size on the Portevin-Le Chatelier effect in Al-Mg alloys, Trans. JIM 13, 82–88.
Tensi, H.M. and Pless, W. (1972) Einfluss von Temperatur und Abgleitgeschwind-igkeit auf den Portevin-Le Chatelier Effekt bei AlMg Einkristallen, Z. Metallkunde 63, 479–484.
Tensi, H.M., Dropmann, P., and Borchers, H. (1972) Portevin-Le Chatelier Effekt in Al-Mg Einkristallen, Acta Metall. 20, 87–93.
Guillot, J. and Grilhe, J. (1972) Phenomene Portevin-Le Chatelier dans les alliages Al-Mg a hautes temperatures, en function de la concentration, Acta Metall. 20, 291–295.
Pink, E. and Grinberg, A. (1982) Stress drops in serrated flow curves of AI5Mg, Acta Metall. 30, 2153–2160.
Robinson, J.M. and Shaw, M.P. (1992) The influence of specimen geometry on the PLC effect in an Al-Mg alloy, Mater. Sci. Eng. A 159, 159–165.
Batik, J. and Lukâc, P. (1993) Portevin-Le Chatelier instabilities in Al-3Mg conditioned by strain rate and strain, Acta Metall. Mater. 41, 1447–1454.
Chmelik, F., Trojanovâ, Z., Prevorovskÿ, Z., and Lukâc, P. (1993) The PLC effect in AI-2.9%Mg0.38%Mn alloy and linear location of acoustic emission, Mater. Sci. Eng. A 164, 260–265.
Kumar, S. and McShane, H.B. (1993) Serrated yielding in Al-Li alloys, Scripta Metall. 28, 1149–1154.
Park, D. and Morris, J.G. (1993) The Portevin-Le Chatelier effect in an Al-Mn-Mg alloy, Scripta Metall. 29, 365–369.
Robinson, J.M. and Shaw, M.P. (1994) Observation on deformation characteristics and microstructure in an Al-Mg alloy during serrated flow, Mater. Sci. Eng. A 174, 1–7.
Robinson, J.M. and Shaw, M.P. (1994) Microstructural and mechanical influences on dynamic strain aging phenomena, Int. Mater. Rev. 39, 113–122.
Robinson, J.M. (1994) Serrated flow in aluminium base alloys, Int. Mater. Rev. 39, 217–227.
Lukâc, P., Batik, J., Chmelik, F., and Trojanovâ, Z. (1994) Plastic instabilities in AI-3%Mg, Solid State Phenomena 35–36, 423–428.
Pink, E. and Krol, J. (1995) Precipitation and serrated flow in AlZn10, Acta Metall. Mater. 43, 2351–2357.
Kumar, S. (1995) Inverse behaviour of the onset strain of serrated flow, Scripta Metall. Mater. 33, 81–86.
Rodriguez, P. amd Venkadesan, S. (1995) Serrated plastic flow revisited, Key Eng. Mater. 103, 257–266.
Chan, K.S., Chen, L.H., and Lui, T.S. (1995) The effect of particles on the critical strain associated with the Portevin-Le Chatelier effect in Al alloys, J. Mater. Sci. 30, 212–218.
Lukâc, P. (1996) Characterisation and modelling of the plastic behaviour of Al alloys, Mater. Sci. Forum 217–222, 71–82.
Chmelik, F., Batik, J., Lukâc, P., Pink, E., and Cepovâ, M. (1996) The Portevin- Le Chatelier effect in an AIZn l0 alloy investigated by the acoustic emission technique, Mater. Sci. Forum 217–222, 10191024
Kral, R., Lukâc, P., and Janecek, M. (1996) Critical conditions for Portevin- Le Chatelier instabilities in AI-4.8%Mg and AI-2.57%Mg alloys Mater. Sci. Forum 217–222, 1025–1030.
Rodriguez, P. (1988) in R.W. Cahn (ed.), Encyclopedia of Materials Science and Engineering, Suppl. Vol. 1, Pergamon Press, Oxford, pp. 504–508.
Penning, P. (1972) Mathematics of the Portevin-Le Chatelier effect,.Acta Metall. 20, 1169–1175.
Kubin, L.P. and Estrin, Y. (1990) Evolution of dislocation densities and the critical conditions for the Portevin-Le Chatelier effect, Acta Metall. Mater. 38, 697–708.
Mulford, R.A. and Kocks, U.F. (1979) New observation on the mechnisms of dynamic strain aging and of jerky flow, Acta Metall. 27, 1125–1134.
Batik, J. and Lukâc, P. (1989) Influence of solute mobility on dislocation motion, Czech. J. Phys. B 39, 447–457.
Louat, N. (1981) On the theory of the Portevin-Le Chatelier effect, Scripta Metall. 15, 1167–1170.
Van den Beukel, A. and Kocks, U.F. (1982) The strain dependence of static and dynamic strain aging, Acta Metall. 30, 1027–1034.
Lukâc, P., Balik, J., and Chmelik, F. (1997) Physical aspects of plastic instabilities, Mater. Sci. Eng. A 234–236, 45–51
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Lukác, P. (1998). The Effect of Strain Rate on Plastic Instabilities in Some Aluminium Alloys. In: Ciach, R. (eds) Advanced Light Alloys and Composites. NATO ASI Series, vol 59. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9068-6_37
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DOI: https://doi.org/10.1007/978-94-015-9068-6_37
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