TY  - JOUR
T1  - Ni/Al7475 Surface Composites Fabricated by Friction Stir Processing
AU - Odah, Jafer Fahdel 
JO  - Journal of Engineering and Applied Sciences
VL  - 13
IS  - 22
SP  - 9532
EP  - 9539
PY  - 2018
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2018.9532.9539
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2018.9532.9539
KW  - friction stir processing
KW  -nickel particles
KW  -AA7475-aluminium
KW  -Surface composite
KW  -retrogression
KW  -intermetallics
AB  - The major object of this study is to fabrication surface Aluminum Matrix Composites (AlMCs) with optimum hardness and the adjusted microstructural as addition to high erosion resistance. Friction Stir Processing (FSP) is used to production the surface composite-Al7475 with nickel particulates as the reinforcements under several parameters. Furthermore, FSP with a rotational speed of 2500 rpm and a traveling speed of 35 mm/min was carried out on the Al7475 matrix composite. The FSPed composites samples were homogenized at 400EC/90 min+430EC/12 h +490EC/10 min and then ageing at 130EC/20 h as well as the retrogression and reaging treatment at 130EC/20 h+190EC/15 min+130EC/20 h were done. Microstructures observations were performed through Optical Microscopy-(OM) and Scanning Electron Microscopy-(SEM) as well as with energy-dispersive X-Ray Spectroscopy-(EDS) and X-Ray Diffraction-(XRD) to identify the intermetallics and precipitations phases of the Al-7475 composites specimens. Results gave that the Al7075 with the nickel reinforces underwent FSP have optimum mechanical properties and uniform microstructural compared with base Al7475-alloy. The grain refiner and uniform dispersions of the Ni-reinforcements within the Al-7475 matrix were acquired due to the optimized parameters of FSP. The more of Ni-intermetallics with the precipitations phase having after heat treatments. The roles of Ni-intercompounds and grain refinements with the hardening of precipitation led to a significant increase in Vickers hardness of the FSPed Al-composites.
ER  -