“…This attribute enhances inter-material flow (around the tip of the pin tool), Mg 2 Si particle distribution, and consequently results in improved wear resistance (reduced friction coefficient) as compared to that of the TC sample. This finding agrees with the works of Paidar et al., 47 Eftekharinia et al., 50 Keneshloo et al., 51 and Moharrami et al. 52 that wear reduction was aided by refinement and even dispersion of reinforced particles.…”
Section: Resultssupporting
confidence: 92%
“…These findings corroborate the works of some reserahers. 47--49 The homogeneous dispersion and the extent of fragmentation/grain refinement of hard reinforcements are acknowledged as the factors that are responsible for the improvement of wear resistance in MMCs. Figure 15.Mass loss of 6061-T6/Al-Mg 2 Si as a function of sliding distance during the wear test.Figure 16.Wear rate of 6061-T6/Al-Mg 2 Si joint as a function of sliding distance.…”
This paper investigates the effect of different tool pin morphologies on the inter-mixing capability, microstructure, mechanical properties, corrosion, fracture, and wear behaviors of the dissimilar friction stir welded AA6061-T6 alloy--Al 20wt% Mg2Si composite. Grooved shoulder tools with varying pin profiles such as tapered cylindrical, threaded tapered cylindrical, and triangular tapered pins were used for joining the base materials. The parameter combination of 80 mm/min travel speed and 1000 r/min rotation speed (at which no visible flow-induced defect was obtained) was used for this study. Among the pin profiles, the triangular tapered pin produced significantly improved intermingling/inter-material flow, fragmentation, and dispersion of the primary Mg2Si particles in the AA6061-T6/Al-Mg2Si joint. The triangular tapered tool reduced the average grain sizes of the AA6061 alloy and the Mg2Si particles from 18.4 to 4.6 µm and from 115 to 7.5 µm, respectively. Intermetallic phases of Mg2Si, AlFe, Al3.21Si0.47, and Al0.7Fe3Si0.3 are formed in the weld nugget of all the AA6061/Al-Mg2Si joints. The tensile strengths of the joints fabricated with tapered cylindrical, threaded tapered cylindrical, and triangular tapered tools are 108, 139, and 141 MPa, respectively. Abrasive wear is promoted in the joints fabricated with triangular tapered tool due to the homogeneous dispersion and fragmentation of the inherent hard Mg2Si particles. The corrosion attack is dependent on the fragmentation level of the Mg2Si phase. Triangular tapered pin tool is recommended for dissimilar Al/composite welding due to favorable tool-induced material flow, dispersion, and fragmentation of reinforcement.
“…This attribute enhances inter-material flow (around the tip of the pin tool), Mg 2 Si particle distribution, and consequently results in improved wear resistance (reduced friction coefficient) as compared to that of the TC sample. This finding agrees with the works of Paidar et al., 47 Eftekharinia et al., 50 Keneshloo et al., 51 and Moharrami et al. 52 that wear reduction was aided by refinement and even dispersion of reinforced particles.…”
Section: Resultssupporting
confidence: 92%
“…These findings corroborate the works of some reserahers. 47--49 The homogeneous dispersion and the extent of fragmentation/grain refinement of hard reinforcements are acknowledged as the factors that are responsible for the improvement of wear resistance in MMCs. Figure 15.Mass loss of 6061-T6/Al-Mg 2 Si as a function of sliding distance during the wear test.Figure 16.Wear rate of 6061-T6/Al-Mg 2 Si joint as a function of sliding distance.…”
This paper investigates the effect of different tool pin morphologies on the inter-mixing capability, microstructure, mechanical properties, corrosion, fracture, and wear behaviors of the dissimilar friction stir welded AA6061-T6 alloy--Al 20wt% Mg2Si composite. Grooved shoulder tools with varying pin profiles such as tapered cylindrical, threaded tapered cylindrical, and triangular tapered pins were used for joining the base materials. The parameter combination of 80 mm/min travel speed and 1000 r/min rotation speed (at which no visible flow-induced defect was obtained) was used for this study. Among the pin profiles, the triangular tapered pin produced significantly improved intermingling/inter-material flow, fragmentation, and dispersion of the primary Mg2Si particles in the AA6061-T6/Al-Mg2Si joint. The triangular tapered tool reduced the average grain sizes of the AA6061 alloy and the Mg2Si particles from 18.4 to 4.6 µm and from 115 to 7.5 µm, respectively. Intermetallic phases of Mg2Si, AlFe, Al3.21Si0.47, and Al0.7Fe3Si0.3 are formed in the weld nugget of all the AA6061/Al-Mg2Si joints. The tensile strengths of the joints fabricated with tapered cylindrical, threaded tapered cylindrical, and triangular tapered tools are 108, 139, and 141 MPa, respectively. Abrasive wear is promoted in the joints fabricated with triangular tapered tool due to the homogeneous dispersion and fragmentation of the inherent hard Mg2Si particles. The corrosion attack is dependent on the fragmentation level of the Mg2Si phase. Triangular tapered pin tool is recommended for dissimilar Al/composite welding due to favorable tool-induced material flow, dispersion, and fragmentation of reinforcement.
“…More details regarding FSW tool geometry and welding conditions are in Table 1. As the tool start forming the joint, the material is heated and plasticized by the leading edge of the tool and transported to the trailing face of the pin, where, upon consolidation, it forms a solid-phase weld [1,15,23].…”
Section: B Fsw's Tool and Processmentioning
confidence: 99%
“…In an explanation of these results, initially the material is extruded at the surface, but as the tool shoulder contacts the upper face of the specimens, the deformed material is compressed between the shoulder, parent material and backing plate. It was found that the main contributor to the frictional heat is the tool shoulder once the tool has penetrated the material [15,23]. Pressure provided by the shoulder forces plastic-like material to the rear of the pin where it consolidates and cools to form a bond.…”
Section: Microstructure Of Fsw Specimensmentioning
“…Most of the earlier studies has been focused on bulk Aluminum composites only, very limited work has been carried in selective region composite welding of Al alloys. M. Paider, (2018) [10] employed WC nano particles as a reinforcement in Al5182 alloy to enhance the mechanical and wear properties of the friction stir welded joint. Refined grain size, uniform dispersion of reinforcement in the composite without clustering effect with base alloy.…”
Recent Years Friction Stir Welding (FSW) is used for joining of metal matrix composites. In this study TiC nano particles were inserted as reinforcements in Al6082 alloy and friction stir welded with three different rotational speeds (750mm, 1000rpm & 1250rpm). The mechanical properties of the welded joints and base alloy were investigated. The specimen welded with 1000rpm rotational speed exhibited better tensile strength and hardness. The enhancement of weld strength is attributed to the uniform dispersion of nano reinforcement particles in the alloy.
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