Process Optimization on Hardness of Precipitation Hardened Al6061 Alloy Using Design of Experiments


Article Preview

Aluminium is ranked after iron and steel in the metal market. Aluminium 6061 alloy has been selected by many designers and engineers for different kind of applications. Further, its strength can be improved by cold working, refinement of grains, precipitation and dispersion hardening. In this work, trials are conducted for the investigation of the effects due to age hardening parameters like, solutionizing time, temperature and time for aging on hardness of 6061 Aluminium alloy using Design of Experiments. The response is predicted by using linier regression model. From the results it can be perceived that, the ageing temperature and aging time have a substantial effect on the response whereas, solutionizing time does not have a significant effect. For a specific set of parameters the hardness is improved from 50 to 74 BHN, resulted in an increase in hardness by about 50%.



Edited by:

Mohd Hamdi Bin Abd Shukor, Omar S. Es-Said and J.H. Chang




G. Shankar et al., "Process Optimization on Hardness of Precipitation Hardened Al6061 Alloy Using Design of Experiments", Materials Science Forum, Vol. 909, pp. 27-32, 2017

Online since:

November 2017




* - Corresponding Author

[1] J.J. Gracio, F. Barlat, E.E. Rauch and P.T. Jones, International Journal of Plasticity: Vol. 20 (2004), p.427.

[2] M.C. Gowri Shankar, Achutha Kini and S.S. Sharma, Indian Journal of Science and Technology: Vol. 9(12) (2016), p.1.

[3] S. Rajasekaran, N.K. Udayashankar, and N. Jagannath, International Scholarly Research Network: Vol. 28 (2012), p.1.

[4] T.V. Rajan, C.P. Sharma, Ashok Sharma, Heat Treatment- Principles and Techniques, Eastern Economy Second Edition (2012), pp.20-27.

[5] A. Rafiq. Siddiqui, Hussein A. Abdullah, Khamis R. Al-Belushi, Influence of aging parameters on the mechanical properties of 6063 aluminium alloy, Journal of Materials Processing Technology, Vol. 102 (2000), pp.234-240.


[6] Siddiqui R. A, S.A. Abdul-Wahab, T. Pervez, Effect of aging time and aging temperature on fatigue and fracture behavior of 6063 aluminum alloy under seawater influence, Materials and Design, Vol. 29 (2008), p.70–79.


[7] Sidney H Anner, Introduction to Physical metallurgy-Second edition, 1976, pp.90-194.

[8] Vijendra Singh, Heat treatment of metals, Standard publishers distributors, 2012, P. 521-535.

[9] H.Q. Wang, Sun W. L, Xing Y. Q, Microstructure Analysis on 6061 Aluminum Alloy after Casting and Diffuses Annealing Process, Physics Procedia-Elsevier, 2013, p.68 – 75.


[10] Young S. Park, Sang B. Lee and Nack J. Kim, Microstructure and Mechanical Properties of Strip Cast Al-Mg-Si-X Alloys, Materials Transactions, Vol. 44(12), (2003) pp.2617-2624.


[11] G. Zaklina, Dusan Bozic, Mirjana Mitkov, The influence of SiC particles on the compressive properties of metal matrix composites Materials Characterization , Vol. 47 (2001), p.129– 138.


[12] Irwin Miller and J.E. Freund, Probability and Statistics for Engineers, Prentice Hall India Ltd., India, Vol. 2 (2001) pp.57-60.

[13] K. Mahadevan, K.T. Raghukandan, Senthilvelan, B.C. Pai, U.T.S. Pillai, Journal of Materials Processing Technology:, Vol. 171 (2006), pp.314-319.