Microstructures and mechanical properties of Al₂O₃/AZ91 surface nanocomposite layer produced by friction stir processing

Abstract

In this paper, the effects of friction stir processing (FSP) parameters on the mechanical properties and microstructures of as-cast magnesium AZ91 alloy are investigated. Grain-growth and microhardness of friction-stir-processed specimens with and without nano-sized aluminium oxide (Al2O3) particles are compared. The effects of process parameters on tunnelling cavity and other friction stir processing defects are discussed. The paper describes the proper process parameters under which a uniform distribution of nano Al2O3 composite reinforcement with good interfacial integrity and significant grain refinement can be produced. Hardness studies revealed that the incorporation of nano-sized Al2O3 particulates in magnesium matrix caused the SZ hardness to increase.

Mathematical modeling and optimization of friction stir welding process parameters in AA5083 and AA7075 aluminum alloy joints

“…FSW is considered as a solid-state process in which the base materials are placed next to each other and then a non-consumable tool comprising shoulder and pin is placed at the center of the joint line. 25–27 Then, the joint is created due to heat generated by shoulder and stirring of plasticized materials by rotation of the tool pin with its traverse movement. 28–30 A schematic view of the FSW process for dissimilar joint of Al alloys is shown in Figure 1.…”

Investigations into the mechanical, morphological and thermal analyses of friction stir processing of high-density polyethylene composites

“…However, adding powders to the HDPE matrix would reduce chain mobility, which caused a decrease in tensile strength. The reduction in the composite materials in tensile strength can also be explained by the model 26…”

“…Increasing the transverse speed would decrease the maximum temperature and the amount of molten material inside the processed zone but increase the heating and cooling rates. 26 It led to the formation of a large number of voids ( Figure 5(e)). When the transverse speed was too high (90 mm/min), there would be high heterogeneity in the processed zone ( Figure 5(f)).…”

“…In FSP, the ''processing time,'' the time during which the material has undergone the thermalmechanical influence, was influenced by transverse speed. 26 It is true that the processing time is longer at low transverse speeds, which promote the mixing of Cu powders and matrix. 7 Meanwhile, the matrix flow stress was reduced at a lower transverse speed, and the particle flow in the matrix became easy.…”

Fabrication of Metal Matrix Composites Using Friction Stir Processing: A Review

“…Optical and scanning electron micrographs shows a uniform distribution of needle shape Al 3 Zr particles in the aluminum matrix. G Faraji et al [12] found the effects of friction stir processing (FSP) parameters on the mechanical properties and microstructures of as-cast magnesium AZ91 alloy and also compared Grain growth and microhardness of friction-stir-processed specimens with and without nano-sized aluminium oxide (Al 2 O 3 ) particles. Yong X. Gan et al [13] did a review of friction stir processing (FSP) technology and its application for microstructure modification of particle reinforced composite materials.M.Puviyarasan et al [14] applied Friction Stir Processing (FSP) a recent grain refinement technique to disperse micron-sized (2µm) SiCp particles into aluminum alloy AA6063.…”