Influence of Thermomecaniques Treatments on the Proprietes of Al-5.8%Zn-2.7%Mg Alloy

Mazouz Hamoudi, Bensaada Said, Mohamed Tewfik Bouziane

Laboratoire LARHYSS, Université de Biskra, Biskra, Algeria.

DOI: 10.4236/msa.2012.38071                

Abstract

The aim of this work is the demonstration of the effect of thermomechanical treatments on the properties of the alloy Al-5.8%Zn-2.7%Mg by thermal analysis techniques and calorimetry, which are methods of test widely used for research purposes and quality control. The effects of thermomechanical treatments on the two variables namely the coefficient of thermal expansion and heat capacity, we can provide further information for better understanding of the phenomena responsible for the thermodynamic behavior of the alloy. The results showed the one hand, there is great similarity between the linear coefficient of thermal expansion and heat capacity, and secondly the effect of plastic deformation is evidenced by changes in the shape of the curves from the rough. Similarly the kinetics of precipitation of η phase is accelerated in the case of samples homogenized and homogenized + distorted and accompanied by a shift in the temperature range to lower temperatures than those recorded in the case of the material state Gross.

Keywords

Aluminum Alloys; Thermomechanical Treatments; Linear Coefficient of Thermal Dilation; Heat Capacity; Precipitation

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	A. Deschanps, F. Livet and F. Bréchet, “Influence of Predeformation on Ageing in an Al-Zn-Mg Alloy,” Acta Materialia, Vol. 47, No. 1, 1999, pp. 281-292.
[2]	M. Benabdoun, “Thèse de Doctorat, Microstructure et Propriétés des Alliages D’aluminium,” Université de Constantine, Algérie, 2004.
[3]	A. Deschanps, “Thèse de Doctorat, Influence de la Prédéformation et des Traitements Thermiques sur la Microstructure et les Propriétés Mécaniques des Alliages Al- Zn-Mg-Cu,” Institut Polyclinique de Grenoble, 1997.
[4]	M. Benabdoun and D. Tahar, “Smail Hamamda Article Etude Dilatomètrique de L’alliage Al-6%Zn-3%Mg,” université de Constantine, Algérie, 2007.
[5]	R. M. Allen and J. B. Vander Sande, “The Oriented Growth of Precipitates on Dislocations in Al-Zn-Mg,” Acta Materialia, Vol. 28, No. 9, 1980, pp. 1185-1189. doi:10.1016/0001-6160(80)90074-7
[6]	P. Gomiero, Proceeding of 4th Intern Conference on Aluminium Alloys, Atlanta, 11-16 September 1994, pp. 644-651.
[7]	R. W. Balluffi, “Annealing Kinetics of Voids and the Self-Diffusion Coefficient in Aluminum,” Physica Status Solidi, Vol. 42, No. 4, 1970, pp. 11-17. doi:10.1002/pssb.19700420102
[8]	S. Ceresara and P. Fiorini, “Effect of Si Excess on the Ageing Behaviour of Al-Mg2Si 0.8% Alloy Mater,” Science & Engineering, Vol. 5, No. 4, 1972, pp. 220-227. doi:10.1016/0025-5416(70)90084-4
[9]	S. Komatsu, et al., “Influence of Predeformation on Ageing in an Al-Zn-Mg Alloy—I. Microstructure Evolution and Mechanical Properties,” Acta Materialia,Vol. 47, No. 1, 1998, pp. 281-292. doi:10.1016/S1359-6454(98)00293-6
[10]	L. S. Mondolfo, N. A. Gjostein and D. W. Lewinson, “Microstructural Evolution and Age Hardening in Aluminium Alloys: Atom Probe Field-Ion Microscopy and Transmission Electron Microscopy Studies,” Materials Characterization,Vol. 44, No. 1, 2000, pp. 101-131.
[11]	A. J. De Ardo and J. R. Simensen, “A Structural Investigation of Multiple Aging of Al-7-wt% Zn-2.3-wt% Mg,” Metallurgical and Materials Transactions B, Vol. 4, No. 10, 1973, pp. 2413-2421.