Mechanical Characterization of Aluminium Alloy 6061 Powder Deposit Made by Friction Stir Based Additive Manufacturing

Abstract:

Additive Friction Stir (AFS) has the potential for extensive future application in metal based additive manufacturing. Powder based AFS is specifically useful for fabricating functionally graded structures. But, the consolidation of powder inside the hollow tool used in this operation hinders the powder based AFS process. This problem could be resolved by Additive Friction Stir Processing (AFSP) while maintaining the key advantages of AFS. A 3D deposit structure of height 5 mm and width 64 mm was made from Al6061 alloy powder by AFSP. Mechanical properties like ultimate tensile strength, yield strength and micro-hardness of the deposit were evaluated in both longitudinal and transverse directions. The ultimate tensile strength and micro-hardness of the deposit were comparable to Al6061-O and there was a significant increment in tensile yield strength. Also, the isotropic nature of the deposit could be inferred from similar mechanical properties in the longitudinal and transverse direction. Dimple ruptures seen in fractographic analysis gave evidence to the ductile nature of the deposit.

• Periodical: Key Engineering Materials (Volume 846)
• Pages: 110-116
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.846.110
• Online since: June 2020
• Authors: Akash Mukhopadhyay*, Probir Saha
• Keywords: 3D Structure, Additive Friction Stir, Additive Friction Stir Processing, Aluminium 6061 Alloy Powder, Fractographic Analysis, Micro-Hardness, Tensile Strength

References

[1] S. Palanivel, P. Nelaturu, B. Glass and R. S. Mishra: Friction stir additive manufacturing for high structural performance through microstructural control in an Mg based WE43 alloy. Mater Des. Vol. 65 (2015), pp.934-952.

DOI: 10.1016/j.matdes.2014.09.082

[2] S. L. Sing, W. Y. Yeong, F. E. Wiria, B. Y. Tay, Z. Zhao, L. Zhao, Z. Tian and S. Yang: Direct selective laser sintering and melting of ceramics: a review. Rapid Prototyp. J. Vol. 23, No. 3 (2017), pp.611-623.

DOI: 10.1108/rpj-11-2015-0178

[3] A. I. Mertens, J. Delahaye and J. Lecomte-Beckers: Fusion-based additive manufacturing for processing aluminum alloys: state-of-the-art and challenges. Adv. Eng. Mater. Vol 19, No. 8, 1700003 (2017), pp.1-13.

DOI: 10.1002/adem.201700003

[4] S. Palanivel, H. Sidhar and R. S. Mishra (2015) Friction stir additive manufacturing: route to high structural performance. JOM. Vol. 67, No. 3 (2015), pp.616-621.

DOI: 10.1007/s11837-014-1271-x

[5] K. Kandasamy, L.E. Renaghan, J.R. Calvert, Creehan, D. Kevin, Schultz and P. Jeffrey: Solid-state additive manufacturing of aluminium and magnesium alloys. In: Proceedings of Materials Science and Technology, Montreal, Quebec, Canada (2013), pp.59-69.

[6] J. R. Calvert: Microstructure and Mechanical Properties of WE43 Alloy Produced Via Additive Friction Stir Technology. Master thesis. Virginia Tech. (2015).

[7] O.G. Rivera, P.G. Allison, J.B. Jordon, O.L. Rodriguez, L.N. Brewer, Z. McClelland, W.R. Whittington, D. Francis, J. Sue, R.L. Martens and N. Hardwicke: Microstructures and mechanical behavior of Inconel 625 fabricated by solid-state additive manufacturing. Mater. Sci. Eng. A. Vol. 694 (2017), pp.1-9.

DOI: 10.1016/j.msea.2017.03.105

[8] W.K. Daye, I. Pelletiers and W. Thomas: Property development of new generation pm aluminum materials via innovative processing. Int. J. Powder Metall. Vol. 54, No. 2 (2018), pp.35-51.

[9] K. Kumara, A. Pooleery, K. Madhusoodanan, R.N. Singh, J.K. Chakravartty, B.K. Dutta and R.K. Sinha, Use of miniature tensile specimen for measurement of mechanical properties. Procedia Eng. Vol. 86 (2014), p.899–909.

DOI: 10.1016/j.proeng.2014.11.112

[10] ASM Metals Handbook, Properties and Selection: Nonferrous Alloys and Special-purpose Materials, vol. 2, 10th ed., ASM International, Materials Park, OH (1990), ISBN 0-87170-378-5.

DOI: 10.31399/asm.hb.v02.9781627081627