Radhika chada,N. Shyam Kumar,



Friction Stir welding (FSW) AA 6061-T6 Hardness Reinforcement particles Microstructure,


Joining of heat-treated alloys(AA6061-T6) by Welding process often results a deterioration of mechanical properties because of the coarsening and dissolution of the strengthening precipitates(Mg2Si,Al3FeSi,Al12FeSi) at the weld nugget. However, its scares the applications of AA6061-T6 alloy. In order to enhance mechanical properties of Friction stir welded(FSW) AA6061-T6 alloy and to minimize the loss of T6 condition , four butt joints (FSW-SiC, FSW- B4C, FSW- Zn and FSW- Al2O3)were fabricate with the addition of harder reinforcement materials such as SiC, B4C,Zn and Al2O3 particles. In this study, the microstructure, tensile strength and  hardness of reinforced friction stir welded AA6061-T6 alloy joints were investigated, while the base metal and the welded joint prepared without reinforcement material were utilized as reference to control the process. The grains refinement ,which had been the reason for improved mechanical properties was increased with the addition of reinforced particles in the weld region. Due to the high density of homogeneous dispersion of harder reinforcement particles and  considerably increased grain refinement in the entire welded joints, all the reinforced welded joints resulted improvements over the unreinforced joint in terms of strength and hardness. The addition of SiC, B4C,Zn and Al2O3 reinforcements  particles increases the tensile strength by 24.2% ,1.79%,32.46 and 10.83% respectively, whereas the elongation decreased as compared to unreinforced welded. Due to extremely high hardness value and homogeneous dispersion of B4C particles in the FSW- B4C joint .It showed the highest percentage of hardness enhancement that was about 54.9% followed by Al2O3, SiC and Zn with improved hardness percentage as 50.37% 40.9%, and 23.2% respectively.


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