Effect of tool pin profile on distribution of reinforcement particles during friction stir processing of B<sub>4</sub>C/aluminum composites

Proceedings of the Institution of Mechanical Engineers, Part E:

Zolghadr

et al. 2017

Self Cite

In this investigation, the mechanical and microstructural properties of aluminum composites reinforced by different reinforcing particles including SiC, TiC, ZrO 2 , and B 4 C were optimized using neural network and NSGA-II. In order to obtain the best microstructural and mechanical properties of aluminum composites, different friction stir processing parameters such as rotational and traverse speed and different reinforcing particles type were used in order to fabricate composites. Results show that friction stir processing significantly affect Si particles size as well as dispersion and fraction of reinforcing particles at the stir zone. Moreover, reinforcing particle types influence the mechanical properties of composites due to difference in hardness and thermal expansion of each reinforcement as well as bonding quality between each reinforcement and aluminum matrix. In order to model the correlation between the friction stir processing parameters and microstructural and mechanical properties of the composites, an artificial neural network model was developed. A modified NSGA-II by incorporating diversity preserving mechanism called the " elimination algorithm was employed to obtain the Pareto-optimal set of friction stir processing parameters. Finally, an approach based on TOPSIS method was applied for determining the best compromised solution from the obtained Pareto-optimal set.

Section: Composite Fabricationmentioning

confidence: 98%

Section: Composite Fabricationmentioning

confidence: 99%

Multicriteria optimization of mechanical properties of aluminum composites reinforced with different reinforcing particles type

Proceedings of the Institution of Mechanical Engineers, Part E:

Zolghadr

et al. 2017

Self Cite

“…Figure 8 illustrates the material flow during FSP of specimen fabricated with threaded pin profile. As shown in the figure, threaded pin profile produces a vertical motion of material in addition to the material revolution around the tool pin [37]. This movement can explain the reason of the elimination of different transverse bands formed in the case of the cylindrical tool pin profile.…”

Section: Resultsmentioning

confidence: 85%

“…Moreover, the material near the top surface of the plate revolves with FSP tool and finally located at the advancing side. As shown in the figure, no vertical motion of material was observed, and the vertical position of material remains almost constant in the specimen fabricated with circular pin profile [37]. Moreover, the material flow generated by square pin profile was studied in our previous work [31].…”

Section: Resultsmentioning

confidence: 92%

The effect of reinforcement type on the microstructure, mechanical properties, and wear resistance of A356 matrix composites produced by FSP

Shojaeefard

Int J Adv Manuf Technol

et al. 2016

Self Cite

Fabrication of particle-reinforced aluminum matrix composites has been pursued with a keen interest recently. However, a comparison of the effect of different reinforcements on the mechanical properties and wear resistance of A356 matrix composites fabricated by FSP is of great interest to be considered. In the present work, the microstructural, mechanical, and wear properties of A356 matrix composites reinforced by SiC, TiC, ZrO 2 , and B 4 C particles are investigated. Moreover, the effect of pin profile on distribution of reinforcing particles in the stir zone of the FSPed specimens is investigated. Hardness and wear tests are performed in order to investigate mechanical and wear properties of the composites. The composite reinforced by TiC particles exhibits higher hardness value compared with other reinforcements due to the excellent bonding between TiC and metal matrix as well as higher hardness value of reinforcement itself than other reinforcements. Moreover, wear test results show that the wear resistance of the composite is significantly improved compared with that of the base metal.

“…The pervious works have considered only single material in their models. [12][13][14][15] Moreover, stable time increment reduces with the ALE method due to the mesh distortion while it remains constant for the CEL method. This leads to higher computation time for ALE as compared with the CEL method.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar friction stir lap welding of aluminum to brass: Modeling of material mixing using coupled Eulerian–Lagrangian method with experimental verifications

Proceedings of the Institution of Mechanical Engineers, Part L:

2020

Self Cite

The intermetallic compounds formation and inter-material mixing have a critical impact on achieving a sound joint with fine mechanical properties in the case of dissimilar metal friction stir welding. In this investigation formation of intermetallic compounds as well as material flow that results in inter-material mixing during friction stir lap welding of aluminum and brass are studied. First, the 2.5-mm-thick aluminum sheet was laid on the same-thickness brass sheet and then, friction stir lap welding was applied using a tool with 4-mm pin length and 6-mm pin diameter. Next, experimental investigations were performed using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, microhardness, and tensile shear test to probe the chemical compositions and intermetallic formation in the stir zone. Moreover, the coupled Eulerian–Lagrangian method is employed to simulate the stir zone formation during the process to further study inter-material mixing. In this method, the workpiece is modeled using Eulerian formulation, while Lagrangian formulation is utilized to model the tool. The model successfully predicts the stir zone formation and inter-material mixing in the aluminum–brass interface. Results shows that by increasing tool rotational speed from 500 to 2000 r/min the amount of inter material mixing significantly increases. Therefore, to achieve a joint with the highest strength in friction stir lap welding of aluminum–brass, the rotational speed should be lowered as much as it can produce defect-free joint.