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IJSTR >> Volume 3- Issue 9, September 2014 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Effect Of Macro Additions Of Zinc And Nickel On The Mechanical And Microstructural Properties Of A Modified 7xxx Aluminium Alloy

[Full Text]

 

AUTHOR(S)

Andrew Idoko Haruna, Innocent Uduehi Abhulimen

 

KEYWORDS

KEYWORDS: hardening, intermetallic, mechanical properties, stir casting and tempering.

 

ABSTRACT

ABSTRACT: There has been large interest in combining the light weight of aluminium with varied excellent mechanical properties that a metal should poses for various industrial applications. This interest has led to vigorous researches in improving the mechanical properties of aluminium.This paper therefore investigatesthe effect of macro additions of zinc and nickel on the mechanical and microstructural properties of a modified 7xxx aluminium alloy. In this investigation, a corresponding relationship has been established between the microstructure and the properties of aluminium. Using the process of stir casting, Zinc was added to Al2.5Mg7Ni and Al2.5Mg2Ni to cast samples which were later homogenized at 550 oC and tempered (T6). Mechanical properties including, tensile strength, tensile elongation, hardness and fracture strength were investigated. Result shows that cast samples containing 15wt%Zn and 2wt%wtNi exhibited superior tensile strength (128.5MPa) and (0.0419) which is attributed to the presence and even distribution of Mg2Si and NiAl3 intermetallic, in the microstructure of the as-cast material. Solution treatment at 550oC led to a good combination of tensile strength and elongation (111.72MPa and 10%). Increase in Nickel content led to a stabilization of the material structure but did not impart strength and ductility. T6 tempering of solution treated samples did not give any increase in the mechanical properties. Microstructure of cast structure shows the presence of three intermetallic including NiAl3, AlFeSi and Mg2Si in the α-aluminium matrix.

 

REFERENCES

[1] C. E. da Costa, W Zapata, F Velasco, Ruiz-Prieto and J. M. Torralba, Journal of Processing Technology, 66, (1999) p. 93-96

[2] F. Ebrahimi, T.G. Hoyle, Acta Mater. (1997) p. 323-327

[3] M. A. Bello Balderas TesisMaestría, Universidad AutónomaMetropolitana México, (2006)

[4] J. Cintas, J. A. Rodríguez y E. J. Herrera, GandiaEspaña, (2002) p. 523-526

[5] M. Gögerbakan, O. Uzun, T. Karaaslan T. and E. J. Herrera, Journal of Materials Processing Technology 142, (2003) p. 87-90

[6] J. M. Martin and F. Castro, Journal of Processing Technology, 143, (1993) p. 814-818

[7] S.M. Barinov, V. Y. Evdokimov, J. Mater. Sci. (1996)

[8] I. J. POLMEAR, ‘Light Alloys –Metallurgy of the Light Metals’, 1995, St. Edmundsbury Press Ltd, UK.

[9] X.-M. Li and M. J. Starink, Mater. Sci. Techn, 2001, vol. 17, 1324-28

[10] F. Hernández-Méndez, A. Altamirano-Torres, José Miranda-Hernández, E. Térres-Rojas and E. Rocha-Rangel, Materials Science Forum Vol. 691 (2011) pp 10-14

[11] NianMei Han: Effects of pre-stretching and ageing on the strength and fracture toughness of aluminium alloy 7050 (2011) Pp 8-12

[12] Pathak, B N, Arvind, K, Sahoo, K L, Talukdar, P., Effect of Ni-Mg on the microstructure and properties of Al-(4-5)Fe-1V-1Si alloys, Elsevier publications, India, 2006, pp 310-315.

[13] Dixit, Mishra and Sankaran ‘Structure–property correlations in Al 7050 and Al 7055 high-strength aluminum alloys’ Materials Science and Engineering A 478 (2008), Pp 163–172.

[14] Gubicza, J, Chinh N Q, Horita, Z, Langdon, T G., Effect of Mg addition on microstructure and mechanical properties of aluminium, Elsevier publications on materials science and engineering, 2004, pp 55-59.