Evaluating the microstructure and mechanical properties of friction stir processed Al–Si alloy

Abstract

In this study, mechanical behaviour and microstructural evolution in friction stir processing (FSP) of casting hypereutectic A390 aluminium alloy have been investigated. The mechanical behaviour of FSP samples was investigated by measuring the strain rate sensitivity using shear punch testing. The room-temperature shear punch tests were conducted at shear strain rates in the range of 10−4–10−1 s−1. The results indicate that the strain rate sensitivity index increases from about 0.015 to 0.120 for as-cast A390 after third FSP pass and then experiences a further growth in FSP passes. The increase in the grain size and CuAl2 intermetallic particle size result in a reduction in strain sensitivity index as well as shear strength after third FSP pass.

Corrosion behaviour of friction stir processed Al–Mg2Si composites

“…The microstructural modification is attributed to the severe thermomechanical treatment of the SZ caused by friction-induced material heating (created by the shoulder) and mechanical material mixing due to the tool pin–matrix interaction [11-15]. Figure 2(c) shows that the average size of primary Mg 2 Si particles in the as-cast sample was 112 ± 24.27 µm.…”

“…As shown in Figure 2, increasing the number of passes significantly reduced the grain size. Dynamic recrystallisation (DRX) mechanism has been reported as the main factor in grain refinement in SZ of FSPed alloys [11][12][13][14][15]17,18]. The observable grain refinement in SZ can be due to the simultaneous heat generation and intense plastic deformation in this area [17][18][19].…”

“…In addition to the above methods, FSP has been recognised as an effective technique for local modification of the microstructure of as-cast Al alloys and composites [11,12]. Moharrami et al [13] studied the effect of the FSP method on the microstructure and dry sliding wear behaviour of Al–20Mg 2 Si composite using three different tools.…”

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

“…e literature has shown some investigations on the influence of FSP on the microstructure and the tensile properties of AL-Si alloy [33]. Golafshani et al [34] and Saini et al [35] performed similar studies with the same alloy subjected to FSP. Process parameters used included tool tilted of angle 3°, while the rotational speed and welding speed were fixed at 1400 rpm and 42 mm/min, respectively.…”

Microstructural and mechanical studies of multi-walled CNTs/Mg composite fabricated through FSP

“…The tribological characteristics of the composites depend upon the microstructure of the material as well as contact of loading conditions thus the wear behavior also agrees with the literature. 37 The minimum weight loss observed for pure magnesium was 0.4321 gram at a combination of 4 m/s sliding velocity, 1000 mm grit size and 1000 m sliding distance respectively. Similarly, minimum weight loss observed for 10MWCNTs/Mg was 0.4031 gram at same input combination.…”