Fabrication of Hybrid Surface Composite through Friction Stir Processing and Its Impression Creep Behaviour

Abstract

Al-Ni in situ surface composites were fabricated by friction stir processing method. Friction stir processing produced a composite with nickel and NiAl 3 as reinforcement particles in aluminium matrix. The particles were fine and were in the submicrometer size range. The separation distance between the particles was very small. Impression creep experiments were conducted on the samples both at friction stir zone and base material zone at various temperatures. Steady state creep rates were estimated, and activation energy for creep was calculated. It is observed that the friction stir zone offered a higher creep resistance compared to the base metal zone. Higher creep resistance is attributed to the dissolution of nickel atoms into aluminium matrix and the presence of fine nickel particles and NiAl 3 precipitates. The measured activation energy indicated that the associated creep mechanism is the dislocation creep in the temperature range of 30-150 ∘ C, both in friction stir zone and base metal zone. At higher temperatures (150-180 ∘ C) the diffusion creep mechanism is suggested.

Fabrication of Friction Stir Processed Al-Ni Particulate Composite and Its Impression Creep Behaviour

“…An attempt is being made in the present investigation to assess the creep behavior of friction stirred Al with nickel powder processed with 8 kN load at different tip rotation speed of 800 rpm. The processing parameters are entirely different compared to those reported earlier in reference [19]. Microstructural features and mechanical properties of FSP Al-Ni composite with 10 kN normal force and 1200 rpm are reported in [19].…”

“…The processing parameters are entirely different compared to those reported earlier in reference [19]. Microstructural features and mechanical properties of FSP Al-Ni composite with 10 kN normal force and 1200 rpm are reported in [19]. Reduction in normal load and tool rotation speed is expected to alter the severity of the stirring, microstructural features, and mechanical properties.…”

Friction stir process: a green fabrication technique for surface composites—a review paper

“…15b. Kishan et al [83] observed that composite having 4 vol % TiB 2 exhibited wear resistance properties as compared with 2 and 8 vol % of TiB2 reinforced composites. Fig.…”

“…Fig. 15 Effects of reinforcement and volume % on Wear [82,83] In the hybrid nanosurface composite of Al/Al 2 O 3 -Al 3 Ni, it was accounted for that NiO particles react with Al and formed Al 3 Ni and Al 2 O 3 favorable properties improvement compounds during FSP and tribological properties of fabricated composites were significantly improved [84]. In the surface composite of Al6063/SiO 2 , it was reported that the hardness of surface composites was directly proportional to the volume percentage of SiO 2 .…”

Aluminium matrix hybrid composites: a review of reinforcement philosophies; mechanical, corrosion and tribological characteristics

“…This has become necessary because metal matrix composites developed via stir casting and powder metallurgy are often reported to have increased strength and stiffness at the expense of ductility and toughness. Friction stir processing offers the opportunity of developing SMMCs with higher surface hardness [76,77] and improved creep resistance while maintaining the ductility and toughness of the metallic substrates [78]. The first result on SMMCs was published in 2003 by Mishra et al [79].…”