Publication: Fabrication and characterization of ultrafine-grained al5083 matrix nanocomposite joint by friction stir welding
| datacite.subject.fos | oecd::Engineering and technology::Materials engineering | |
| dc.contributor.author | Muhamad Nabil Bin Faizul Hilmy | |
| dc.date.accessioned | 2025-04-29T06:56:14Z | |
| dc.date.available | 2025-04-29T06:56:14Z | |
| dc.date.issued | 2023-05-01 | |
| dc.description.abstract | An investigation of friction stir welding (FSW) process parameters was onducted on ultrafine-grained (UFG) cryorolled AA5083 to determine the best combination processparameter. Prior to FSW, the as received AA5083 sample was cryorolled to produce UFG structure, which reduced the thickness by 50%. Welding parameters for the UFGcryorolled AA5083 includes tool rotational speed (10, 600, 865, 1140, 1500 rpm), welding speed (65, 127, 264, 367, 500 mm/min), and tool tilt angle (1, 1.5, 2, 2.5, 3°).To assess the quality of the welded joints, a visual inspection technique, macroscopic and microscopic analysis, Vickers microhardness test, tensile test, and fracture observation were used. The best combination of FSW process parameters was obtained at 865 rpm, 264 mm/min, and 2°. The sample welded at the best parameter combination had a smooth welded surface with no traces of surface defect, a defect- free welded joint, and the finest grain size within nugget zone (NZ) with an average size of 27.6 µm. Furthermore, the sample had the highest microhardness (91.8 HV), and the highest ultimate tensile strength (144.88 MPa). The surface of the sample had fine dimples with fewer cleavage facet structure, indicating that the sample fractured in ductile manner. However, the as-received welded joint had a better quality with higher microhardness (92.2HV) and ultimate tensile strength (149.2 MPa) than UFG welded joint. To improve the strength of UFG welded sample, nanoparticles AL2O3 was added as a reinforcement during FSW. When Al2O3 nanoparticles were added to the UFG sample, the grain was refined to 17.3 µm in the NZ, resulting in a higher microhardness of 102.5 HV and tensile strength of 163.8 MPa when compared to the Al2O3 reinforced welded joint of the as received sample. The spring back values of both unreinforced UFG (1.7⁰) an as-received (2.3°) were lower than reinforced of UFG (2.8°) and as-received (3.7⁰). At the highest applied load of 50N, Al2O3 nanoparticles reinforced welded joints of UFG cryorolled and as-received recorded low specific wear rate of 6.66 x 10-5 mm3 N -1 m-1 and 7.722 x 10-5 mm3 Nm-1 respectively | |
| dc.identifier.uri | https://erepo.usm.my/handle/123456789/21463 | |
| dc.language.iso | en | |
| dc.title | Fabrication and characterization of ultrafine-grained al5083 matrix nanocomposite joint by friction stir welding | |
| dc.type | Resource Types::text::thesis::master thesis | |
| dspace.entity.type | Publication | |
| oairecerif.author.affiliation | Universiti Sains Malaysia |