Efect of Tool Rotational Speed on Microstructure and Mechanical  Properties of Friction Stir Welded Al–16Si–4Cu–10SiC Composite/ Al–4Cu–Mg Alloy Joints

Aval, Hamed Jamshidi; Galvão, Ivan

http://hdl.handle.net/10400.21/17874

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Authors

Aval, Hamed Jamshidi

Galvão, Ivan

Abstract(s)

This study investigates the effects of different rotational speeds on the friction stir welding process of two distinct materials: an Al-16Si-4Cu-10SiC composite and an Al-4Cu-Mg alloy. The research primarily concentrates on the microstructure, mechanical properties, and corrosion resistance of the welded materials. The findings reveal that surface grooves and tunnel defects emerge at heat inputs of 1296 and 3024 J/mm, respectively. When the rotation speed decreases from 1200 to 800 rpm, the Zener parameter increases from 12.45 x 1013 to 14.78 x 1014, and the average grain size after recrystallization reduces from 3.7 +/- 0.3 to 2.1 +/- 0.4 mu m. The welding process results in the formation of theta-Al2Cu and S-Al2CuMg precipitates in the stir zones of the Al-16Si-4Cu-10SiC composite and Al-4Cu-Mg alloy, respectively. A reduction in rotational speed from 1200 to 800 rpm leads to hardness, ultimate tensile strength, and corrosion resistance values of 149.8 +/- 10.1 HV, 401.4 +/- 8.1 MPa, and 0.39 mm/year, respectively.