Effect of Cold Plastic Deformation Prior to Ageing on Creep Resistance of an Al-Cu-Mg-Ag Alloy

Abstract:

Article Preview

Effect of thermomechanical processing on creep resistance at 150°C of an Al-5.6Cu-0.72Mg-0.5Ag-0.32Mn-0.17Sc-0.12Zr (wt. %) alloy was examined. It was shown that increasing strain prior to artificial aging provides achieving high strength. However, a degradation of the creep resistance, i.e., significant decrease in the rupture time and increase in the minimal creep rate, took place, concurrently. The effect of cold rolling on the strength and creep resistance is discussed in relation with the strain effect on the dispersion of secondary phases. The increase in strength and degradation of creep properties of the alloy subjected to cold working before ageing result from superposition of two competitive processes. First, an increase in the lattice dislocation density facilitates the precipitation of Ω-phase plates with high aspect ratio, leading to increase in the static strength at room temperature. Second, acceleration of the diffusion processes results in coarsening of strengthening phase in grain/subgrain interiors and precipitation of Ω-phase on deformation-induced boundaries during creep that deteriorates creep resistance.

Info:

Periodical:

Materials Science Forum (Volumes 794-796)

Edited by:

Knut Marthinsen, Bjørn Holmedal and Yanjun Li

Pages:

278-283

Citation:

M. Gazizov et al., "Effect of Cold Plastic Deformation Prior to Ageing on Creep Resistance of an Al-Cu-Mg-Ag Alloy", Materials Science Forum, Vols. 794-796, pp. 278-283, 2014

Online since:

June 2014

Export:

Price:

$38.00

* - Corresponding Author

[1] I.J. Polmear, G. Pons, Y. Barbaux, H. Octor, C. Sanchez, A.J. Morton, W.E. Borbidge, S. Rogers, After Concorde: Evaluation of creep resistant Al-Cu-Mg-Ag alloys, Mater. Sci. Tech. 15 (1999) 861-868.

DOI: https://doi.org/10.1179/026708399101506599

[2] D. Bakavos, P.B. Prangnell, B. Bes, F. Eberl, The effect of silver on microstructural evolution in two 2xxx series Al-alloys with a high Cu: Mg ratio during ageing to a T8 temper, Mater. Sci. Eng. A491 (2008) 214-223.

DOI: https://doi.org/10.1016/j.msea.2008.03.014

[3] M. Vural, J. Caro, Experimental analysis and constitutive modeling for the newly developed 2139-T8 alloy, Mater. Sci. Eng. A520 (2009) 56-65.

DOI: https://doi.org/10.1016/j.msea.2009.05.026

[4] J. Wang, X. Wu, K. Xia, Creep behaviour at elevated temperatures of an Al-Cu-Mg-Ag alloy, Mater. Sci. Eng. A234-236 (1997) 287-290.

DOI: https://doi.org/10.1016/s0921-5093(97)00141-x

[5] Y. Li, Z. Liu, S. Bai, X. Zhou, H. Wang, S. Zeng, Enhanced mechanical properties in an Al-Cu-Mg-Ag alloy by duplex aging, Mater. Sci. Eng. A528 (2011) 8060-8064.

DOI: https://doi.org/10.1016/j.msea.2011.07.055

[6] M. Gazizov, V. Teleshov, V. Zakharov, R. Kaibyshev, Solidification behaviour and the effects of homogenisation on the structure of an Al-Cu-Mg-Ag-Sc alloy, J. Alloys Compd. 509 (2011) 9497-9507.

DOI: https://doi.org/10.1016/j.jallcom.2011.07.050

[7] M. Gazizov, R. Kaibyshev, Effect of over-aging on the microstructural evolution in an Al-Cu-Mg-Ag alloy during ECAP at 300°C, J. Alloys Compd. 527 (2012) 163-175.

DOI: https://doi.org/10.1016/j.jallcom.2012.02.144

[8] M. Gazizov, I. Zuiko, R. Kaibyshev, Effect of plastic deformation on a dispersion of omega-phase and mechanical properties of an Al-Cu-Mg-Ag alloy (Proceedings of International Conference THERMEC, Dec. 2-6, 2013, Las Vegas, USA).

DOI: https://doi.org/10.4028/www.scientific.net/amr.922.189

[9] J.F. Nie, B.C. Muddle, Microstructural design of high-strength aluminum alloys, J. Ph. Equilib. 19(6) (1998) 543-551.

[10] I.J. Polmear, G. Pons, H. Octor, C. Sanchez, A.J. Morton, W.E. Borbidge, S. Rogers, After Concorde: Evaluation of creep resistant Al-Cu-Mg-Ag alloy for use in the proposed European SST, Mater. Sci. Forum. 217-222 (1996) 1759-1764.

DOI: https://doi.org/10.4028/www.scientific.net/msf.217-222.1759

[11] A.W. Thompson, J.C. Chesnutt, "Identification of a Fracture Mode: The Tearing Topography. Surface, Metall. Trans. A 10A (1979) 1193-1196.

Fetching data from Crossref.
This may take some time to load.