Microstructure and Mechanical Characterization of an Al-Zn-Mg Alloy after Various Heat Treatments and Room Temperature Deformation

Abstract:

Article Preview

In this study, the effect of various solution and aging treatments on microstructure and mechanical properties of an as cast Al-5.5Zn-1.2Mg alloy has been investigated by optical microscopy, hardness measurements and room temperature tensile test. The solution heat treatments performed at temperatures between 400 and 490°C have little effects on hardness while electrical conductivity values increased at the lower temperature because of dissolved atoms and vacancy rich clusters. Concerning aging, only T6 improves mechanical properties of the undeformed alloy, while aging performed on tensile tested samples results in a decrease of hardness due to accelerated kinetics and heterogeneous nucleation of equilibrium phase stimulated by dislocation network. Tensile tested samples of the as cast alloy exhibits the fastest recrystallization time during annealing because of the absence of fine precipitates and the high strain hardening.

Info:

Periodical:

Materials Science Forum (Volumes 604-605)

Edited by:

Marcello Cabibbo and Stefano Spigarelli

Pages:

67-76

DOI:

10.4028/www.scientific.net/MSF.604-605.67

Citation:

P. Leo et al., "Microstructure and Mechanical Characterization of an Al-Zn-Mg Alloy after Various Heat Treatments and Room Temperature Deformation", Materials Science Forum, Vols. 604-605, pp. 67-76, 2009

Online since:

October 2008

Export:

Price:

$35.00

[1] T. Engdahl, V. Hansen, P.J. Warren, K. Stiller: Mater. Sci. Eng. A Vol. 327 (2002), p.59.

[2] K. Stiller, P.J. Warren, V. Hansen, J. Angenete, J. Gjonnes: Mater. Sci. Eng. A Vol. 270 (1999), p.55.

[3] S.K. Maloney, K. Hono, I.J. Polmear, S.P. Ringer: Scripta Mater. Vol. 41, 10 (1999), p.1031.

[4] H.Z. Li, V. Hansen, J. Jonnes, L. R. Wallenberg : Acta Mater. Vol. 47, 9. (1999), p.2651.

[5] L.K. Berg, G. Gjonnes, V. Hansen et al.: Acta Mater Vol. 49 (2001), p.3493.

[6] J.C. Werwnskiold, A. Deschemps, Y. Bréchet: Mater. Sci. Eng. A Vol. 293 (2000), p.267.

[7] H. Loffer, I. Kovacs, J. Lendvai: J. Mater. Sci. Vol. 18 (1983), p.2215.

[8] Z. Katz, N. Ryum: Scripta Met. Vol. 15 (1981), p.265.

[9] G. Waterloo, V. Hansen, J. Gjonnes, S.R. Skjervold: Mater. Sci. Eng. A Vol. 303 (2001), p.226.

[10] Bjorn Ronning, PH.D. Thesis Constitutive relationships for AlZnMg, AlZnMgCr and AlZnMgZr alloys, October 1998, NTNU , Trondheim a b.

DOI: 10.1007/s11661-001-0092-z

[11] J. Polmear: Light alloys -Metallurgy of light metals, 3rd Edition, Butterworth-Heinmann, Oxford (2000), Chapter 2, 3, 4.

[12] S.T. Lim, S.J. Yun, S.W. Nam: Mater. Sci. Eng. A Vol. 371 (2004), 82 pp.844-864.

[13] A.V. Benedetti, P.L. Cabot, J.A. Garrido and A.H. Moreira: J. Appl. Elettroch. 31 (2001), p.293.

[14] S. Naiyu et al : Mater. Sci. Eng. A Vol. 416 (2006), p.232.

[15] O. Engler, J. Hirsch, K. Lucke: Acta Metall. Mater Vol. 43 n. 1 (1995), p.121.

[16] I.J. Polmear: J. Inst. Metals Vol. 86 (1957), p.113.

[17] J.D. Embury, R.B. Nicholson: Acta Metall. Vol. 13 (1965), p.403.

[18] N. Ryum: Z. Metallkd Vol. 66 (1975), p.344.

[19] J. Lendvai: Mater. Sci. Forum Vol. 43 (1996), p.217.

[20] D.S. Thomson in: R.F. Schwenker, R.F. Schwenker Jr, P.D. Garn, Thermal Analysis, vol. e, Academic Press, (1969), 1147.

[21] M. Baki Karamis, I. Halici: Mater. Letters Vol. 61 (2007), p.944.

[22] J. Dutkiewicz, J. Bonarski: Materials & Design Vol. 18 n. 46(1997), p.247.

In order to see related information, you need to Login.