Commenced in January 2007
Paper Count: 30172
Effect of Heat Treatment on the Portevin-Le Chatelier Effect of Al-2.5%Mg Alloy
Abstract:An experimental study is presented on the effect of microstructural change on the Portevin-Le Chatelier effect behaviour of Al-2.5%Mg alloy. Tensile tests are performed on the as received and heat treated (at 400 ºC for 16 hours) samples for a wide range of strain rates. The serrations observed in the stress-time curve are investigated from statistical analysis point of view. Microstructures of the samples are characterized by optical metallography and X-ray diffraction. It is found that the excess vacancy generated due to heat treatment leads to decrease in the strain rate sensitivity and the increase in the number of stress drop occurrences per unit time during the PLC effect. The microstructural parameters like domain size, dislocation density have no appreciable effect on the PLC effect as far as the statistical behavior of the serrations is considered.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1084157Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1847
 A. Sarkar, A. Chatterjee, P. Barat and P. Mukherjee, "Comparative study of the Portevin-Le Chatelier effect in interstitial and substitutional alloy," Mat. Sci. Eng. A, vol. 459, pp. 361-365, June 2007.
 P. Barat, A. Sarkar, P. Mukherjee, S.K. Bandyopadhyay, " Scaling behavior of the Portevin-Le Chatelier effect in Al-2.5%Mg alloy," Phy. Rev. Lett., vol. 94, pp. 055502.1-055502.4, Feb. 2005.
 A.H. Cottrell, Dislocations and plastic flow in crystals, London, Oxford University Press, 1953.
 P.G. McCormick, "A model for the Portevin-Le Chatelier effect in the substitutional alloys," Acta Metall., vol. 20, pp. 351-354, March, 1972.
 J.D. Baird, The Inhomogeneity of Plastic Deformation, American Society of Metals, OH, 1973.
 A. Van den Beukel, "Theory of the effect of dynamic strain aging on mechanical properties," Phy. Status Sol (a), vol. 30, pp. 197-206, Feb. 1975.
 A. Van den Beukel, U.F. Kocks, "The strain dependence of static and dynamic strain aging," Acta Metall., vol. 30, pp. 1027-1034, May 1982.
 J. Schliph, "On the kinetics of static and dynamic strain aging," Scripta Metall. Mater., vol. 31, pp. 909-914, Oct. 1994.
 R.C. Picu, "A mechanism for the negative strain rate sensitivity of dilute solute solutions," Acta Mater., vol. 52, pp. 3447-3458, July 2004.
 H. Jiang, Q. Zhang, X. Chen, Z. Chen, Z. Jiang, X. Wu, J. Fan, "Three types of Portevin -Le Chatelier effect: Experiment and modeling," Acta Mater., vol. 55, pp. 2219-2228, April 2007.
 A.W. Sleeswyk, " Slow strain hardening of ingot iron," Acta Metall., vol. 6, pp. 598-603, Sep. 1958.
 R.A. Mulford, U.F. Kocks, "New observations on the mechanisms of dynamic strain aging and of jerky flow," Acta Metall., vol. 27, pp. 1125- 1134, July 1979.
 F. Chmelik, F.B. Klose, H. Dierke, J. Sachl, H. Neuhauser, P. Lukac, "Investigating the Portevin- Le Chatelier effect in strain rate and stress rate controlled tests by the acoustic emission and laser extensometry techniques," Mat. Sci. Eng. A, vol. 462, pp. 53-60, July 2007.
 J.M. Robinson and M.P. Shaw, "The influence of specimen geometry on the Portevin- Le Chatelier effect in an Al-Mg alloy," Mat. Sci. Eng. A, vol. 159, pp. 159-165, Dec. 1992.
 K. Chihab, Y. estrin, L.P. Kubin and J. Vergnol, " The kinetics of the Portevin-Le Chatelier bands in in an Al-5at%MG alloy," Scripta Metall., vol. 21, pp. 203-208, Feb. 1987.
 J. Balik, P. Lukac and L.P. Kubin, " Inverse critical strains for Jerky flow in Al-Mg alloys," Scripta Mater., vol. 42, pp. 465-471, Feb. 2000.
 M. Abbadi,P. Hahner and A. Zeghloul, "On the characteristics of the Portevin-Le Chatelier bands in aluminum alloy 5182 under stress controlled and strain controlled tensile testing," Mat. Sci. Eng. A, vol. 337, pp. 194-201, Nov. 2002.
 B.J. Roopchand and J.G. Morris, "The effect of cold work on the strain rate sensitivity of 5086 aluminum alloy," Scripta Metall., vol. 7, pp. 839- 845, Aug. 1973.
 Wei Wen and J.G. Morris, "The effect of cold rolling and annealing on the serrated yielding phenomenon of AA5182 aluminum alloy," Mat. Sci. Eng. A, vol. 373, pp.204-216, May 2004.
 Defect and microstructure analysis by diffraction, R.L. Synder, J. Fiala and H.J. Bunge, Ed. New York, Oxford University Press, 1999.
 Diffraction analysis of the microstructure of materials, vol. 68, E.J. Mittemeijer and P. Scardi Ed. Berlin, Springer-Verlag, 2004.
 I. Groma, "X-ray line broadening due to an inhomogeneous dislocation distribution," Phy. Rev. B, vol. 57, pp. 7535-7542, April 1998.
 A. Borbely, I. Groma, "Variance method for the evaluation of the particle size and dislocation density from x-ray Bragg peaks," App. Phy. Lett., vol. 79, pp. 1772-1774, Sep. 2001.
 Th. H.de Keijser J. I.Langford E. J.Mittemeijer A. B. P.Vogels, "Use of the Voigt function in a single-line method for the analysis of X-ray diffraction line broadening," J. Appl. Cryst., vol. 15, pp. 308-314, June 1982.
 R.C. Picu, G. Vincze, J.J. Gracio and F. Barlat, "Effect of solute distribution on the strain rate sensitivity of solute solutions," Scripta Mater., vol. 54, pp. 71-75, Jan 2006.
 M.A. Lebyodkin, Y. Brechet, Y. Estrin and L.P. Kubin, "Statistics of the Catastrophic Slip Events in the Portevin-Le Ch├ótelier Effect," Phy. Rev. Lett., vol. 74, pp. 4758-4761, June 1995.
 M. Lebyodkin, Y. Brechet, Y. Estrin and L.P. Kubin, "Statistical behavior and strain localization pattern in the Portevin-Le Chatelier effect," Acta Mater., vol. 44, pp. 4531-4541, Nov. 1996.
 J. May, H.W. Hoppel and M. Goken, "Strain rate sensitivity of ultrafinegrained aluminum processed by severe plastic deformation," Scripta Mater., vol. 53, pp. 189-194, July 2005.
 L.P. Kubin and Y. Estrin, "Evolution of the dislocation densities and the critical conditions for the Portevin-Le Chatelier effect," Acta Metall. Mater., vol. 38, pp. 697-708, May 1990.
 R. Shabadi, S. Kumar, H.J. Roven and E.S. Dwarakadasa, "Characterization of the PLC band parameters using laser speckle technique," Mat. Sci. Eng. A, vol. 364, pp. 140-150, Jan. 2004.
 H. Louche, P. Vacher and R. Arrieux, "Thermal observations associated with the Portevin-Le Chatelier effect in an Al-Mg alloy," vol. 404, pp. 188-194, Sep. 2005.
 Q. Zhang, Z. Jiang, H. Jiang, Z. Chen and X. Wu, "On the propagation and pulsation of Portevin-Le Chatelier deformation bands: An experimental study with digital speckle pattern metrology," Int. J. Plasticity, vol. 21, pp. 2150-2173, Nov. 2005.
 F. B. Klose, A. Ziegenbein, F. Hagemann, H. Neuh├ñuser, P. H├ñhner, M. Abbadi, A. Zeghloul, "Analysis of Portevin-Le Chatelier serrations of type B in Al-Mg," Mat. Sci. Eng. A, vol. 369, pp. 76-81, March 2004.