Purpose The paper aims to clarify the hybrid Mg alloy composites reinforced with multi-walled carbon nanotube (MWCNT) and Cerium (Ce) rare earth element tribological properties were investigated by using pin-on-disk test configuration under dry and lubricated sliding conditions. Design/methodology/approach The paper opted for an experimental study with composite samples under lubricated conditions. Their tribological properties were investigated by using pin-on-disk test configuration under dry and lubricated sliding conditions. Wear tests were carried out at 20°C temperature. Wear behavior of Mg alloy composites was evaluated as maximum coefficient of friction and the variation of the maximum frictional forces of the samples. Findings The reinforcements such as Ce and MWCNT have a decreasing effect between 100 and 200 rpm speed tests for friction coefficient and friction force of Mg alloy. The microstructure has an important effect on the wear mechanism. There can be both adhesive and abrasive wear mechanism for the same composite at different sliding speeds. It is determined that there is no systematic relationship between reinforcement percent and sliding speed related to wear behavior of AZ 41 matrix composites reinforced with CNT and Ce. The results indicate that different wear mechanisms occur at different sliding speeds. The sliding speed has effect on both an increment and decrement for wear. Research limitations/implications Because of the chosen research approach, the research results may lack generalizability. Therefore, researchers are encouraged to test the different reinforced composite samples further. Practical implications The paper includes implications for the development of a hybrid composite reinforced with rare earth elements and MWCNT. Originality/value This paper fulfils an identified need to study a hybrid composite reinforced with rare earth elements and MWCNT.

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The reciprocating extrusion (RE) method was developed to fabricate the fine grain AA 6061 and AA 6063 alloys and to obtain their optimum mechanical properties. While 6061/72 μm aluminium alloy powder and AA 6063 bar material were used as a matrix material separately, SiC/20 μm ceramic particles were used as reinforcement. Billets were produced from AA 6061 powders and AA 6063 materials mixed with SiC ceramic particles by sintering and stir casting method respectively. Using the RE process, which was performed at 573 K for one, five and nine passes, the billets were extruded again to investigate the microcharacterisation of the products. The hardness, microstructure, grain size and distribution of the extruded samples were examined and analysed using an SEM. High resolution electron backscatter diffraction and TEM methods were also applied for grain analysis. The manufacturing method of the billets to be extruded reciprocatively affects the hardness that occurs after the deformation. The hardnesses of all samples increase first and then decrease with pass number. After extrusion passes, the longer or larger silicon particles were broken into finer particles and microstructures were changed from the initial to a new structure. A homogeneous distribution of SiCp and refined grain structure of the test materials were obtained by RE. However, the process temperature applied during the process has a greater effect on the change in grain size than that of the occurring deformation.

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