Experimental Investigations on Microstructural and Mechanical Behavior of Friction Stir Welded Aluminum Matrix Composite


Department of Mechanical Engineering, National Institute of Technology, Kurukshetra, Haryana, India


The welding of materials by applying Friction Stir Welding technique is a new solid-state joining technique. The main advantage of this method compared to the traditional joining process is that it minimizes problem-related to metal resolidification as the method incorporates no melting phase. In this experimental work, the effect of friction stir welding (FSW) technique on the microstructure and mechanical properties of the cast composite matrix AA6063 reinforced with 7wt % SiC particles is studied. Friction stir welding, owing to the simultaneous effect of intense plastic deformation and frictional heat generated throughout welding, had impacts each on the reinforcement agents and the matrix alloy. FSW produced a notable reduction in the size of reinforcement agents and their homogeneous distribution in the weld region. It also induced the grain refinement due to dynamic recrystallization of the aluminum matrix alloy in the weld area. The frictional heat generated during friction stir welding had impacts on the growth, dissolution and reprecipitation of the hardening precipitates. The microstructural changes resulted in improved mechanical properties such as UTS, elongation, and hardness of the joint. A joint efficiency of 98.84% was observed for the welded joint. The XRD and EDX analysis of the welded area confirmed that there was no formation of any other compound due to the frictional heat produced during welding. The SEM fracture morphology of the welded joint revealed that the fracture behavior was changed from ductile to brittle following to FSW.


1.     Rezaei, G. and Arab, N.B.M., "Investigation on tensile strength of friction stir welded joints in pp/epdm/clay nanocomposites", International Journal of Engineering-Transactions C: Aspects,  Vol. 28, No. 9, (2015), 1382-1391.

2.     Hasanzadeh, R., Azdast, T., Doniavi, A., Babazadeh, S., Lee, R., Daryadel, M. and Shishavan, S., "Welding properties of polymeric nanocomposite parts containing alumina nanoparticles in friction stir welding process", International Journal of Engineering Transactions A: Basics,  Vol. 30, No. 1, (2017), 143-151.

3.     Mishra, R.S. and Ma, Z., "Friction stir welding and processing", Materials Science and Engineering: R: Reports,  Vol. 50, No. 1-2, (2005), 1-78.

4.     Singh, R., Rizvi, S.A. and Tewari, S., "Effect of friction stir welding on the tensile properties of aa6063 under different conditions", International Journal of Engineering Transactions A: Basics,  Vol. 30, No. 4, (2017), 597-603.

5.     Chidambaram, A. and Bhole, S., "Metallographic preparation of aluminum-alumina metal-matrix composites", Materials Characterization,  Vol. 38, No. 3, (1997), 187-191.

6.     Azdast, T. and Hasanzadeh, R., "Tensile and morphological properties of microcellular polymeric nanocomposite foams reinforced with multi-walled carbon nanotubes", International Journal of Engineering, Transaction C-Aspects,  Vol. 31, (2018), 504-510.

7.     Amirizad, M., Kokabi, A., Gharacheh, M.A., Sarrafi, R., Shalchi, B. and Azizieh, M., "Evaluation of microstructure and mechanical properties in friction stir welded a356+ 15% sicp cast composite", Materials Letters,  Vol. 60, No. 4, (2006), 565-568.

8.     Ma, Z., Feng, A., Xiao, B., Fan, J. and Shi, L.K., "Microstructural evolution and performance of friction stir welded aluminum matrix composites reinforced by sic particles", in Materials science forum, Trans Tech Publ. Vol. 539, (2007), 3814-3819.

9.     Vijay, S. and Murugan, N., "Influence of tool pin profile on the metallurgical and mechanical properties of friction stir welded al–10 wt.% tib2 metal matrix composite", Materials & Design,  Vol. 31, No. 7, (2010), 3585-3589.

10.   Chen, X.-G., Da Silva, M., Gougeon, P. and St-Georges, L., "Microstructure and mechanical properties of friction stir welded aa6063–b4c metal matrix composites", Materials Science and Engineering: A,  Vol. 518, No. 1-2, (2009), 174-184.

11.   Guo, J., Gougeon, P. and Chen, X., "Characterisation of welded joints produced by fsw in aa 1100–b4c metal matrix composites", Science and Technology of Welding and Joining,  Vol. 17, No. 2, (2012), 85-91.

12.   Nami, H., Adgi, H., Sharifitabar, M. and Shamabadi, H., "Microstructure and mechanical properties of friction stir welded al/mg2si metal matrix cast composite", Materials & Design,  Vol. 32, No. 2, (2011), 976-983.

13.   Dinaharan, I. and Murugan, N., "Effect of friction stir welding on microstructure, mechanical and wear properties of aa6061/zrb2 in situ cast composites", Materials Science and Engineering: A,  Vol. 543, (2012), 257-266.

14.   Langari, J., Kolahan, F. and Aliakbari, K., "Effect of tool speed on axial force, mechanical properties and weld morphology of friction stir welded joints of a7075-t651", International Journal of Engineering,  Vol. 29, (2016), 403-410.

15.   Zarooni, M. and Eslami-Farsani, R., "Effect of welding heat input on the intermetallic compound layer and mechanical properties in arc welding-brazing dissimilar joining of aluminum alloy to galvanized steel", International Journal of Engineering-Transactions B: Applications,  Vol. 29, No. 5, (2016), 669-678.

16.   Nikoi, R., Sheikhi, M. and Arab, N.B.M., "Experimental analysis of effects of ultrasonic welding on weld strength of polypropylene composite samples", International Journal of Engineering-Transactions C: Aspects,  Vol. 28, No. 3, (2014), 447-453.

17.   Toptan, F., Kilicarslan, A., Karaaslan, A., Cigdem, M. and Kerti, I., "Processing and microstructural characterisation of aa 1070 and aa 6063 matrix b4cp reinforced composites", Materials & Design,  Vol. 31, (2010), S87-S91.

18.   Minak, G., Ceschini, L., Boromei, I. and Ponte, M., "Fatigue properties of friction stir welded particulate reinforced aluminium matrix composites", International Journal of Fatigue,  Vol. 32, No. 1, (2010), 218-226.

19.   Baxter, S. and Reynolds, A., "Characterization of reinforcing particle size distribution in a friction stir welded al‐sic extrusion", Lightweight Alloys for Aerospace Application,  (2001), 283-293.

20.   Prado, R., Murr, L., Shindo, D. and Soto, K., "Tool wear in the friction-stir welding of aluminum alloy 6061+ 20 al 2 o 3: A preliminary study", Scripta Materialia,  Vol. 1, No. 45, (2001), 75-80.

21.   Kumar, B.A. and Murugan, N., "Metallurgical and mechanical characterization of stir cast aa6061-t6–alnp composite", Materials & Design,  Vol. 40, (2012), 52-58.