Tribological properties of Al 7075 alloy and Al 7075 metal matrix composite reinforced with SiC, sliding under dry, oil lubricated, and inert gas environments

Abstract

Tribological properties of silicon carbide-based aluminum metal matrix composite and aluminum matrix alloy have been studied for various sliding speeds of 3.14 and 3.77 m/s and load range from 10 to 30 N under dry, lubricated, and inert gas (argon) environment. Pin-on-disk tribometer were used for experiments. The composite was fabricated by stir casting route by using aluminum 7075 alloy as the matrix and 10% by weight silicon carbide as reinforced material. Results have revealed that the value of coefficient of friction is found to be maximum in case of inert condition in matrix alloy at sliding speed 3.77 m/s and minimum in case of lubricated condition in composite at sliding speed 3.14 m/s. The wear rate is least for both the alloy and the composite under lubricated condition compared with dry and inert condition. Wear rate increases with the normal load and sliding speed and it is maximum in inert condition of matrix alloy at 30 N. Uniform distribution of silicon carbide in aluminum matrix alloy reduces the values of coefficient of friction and wear rate for composites compared to aluminum matrix alloy under dry, lubricated, and inert condition which increases the life of the composites for longer duration. Silicon carbide significantly improves the strength the aluminum matrix alloy in dry, lubricated, and inert condition and acts as load-bearing members.

Effects of processing parameters on mechanical, material flow and wear behaviour of friction stir welded 6101-T6 and 7075-T651 aluminium alloys

“…MFTI7 software of the tribometer used generates the wear volume, depth and coefficient of friction while the wear rate and the wear resistance were calculated using equation (1) [35,36]. Table 4 shows the summary of the results obtained for the wear test for each processing parameter employed.…”

Review on properties of aluminium metal matrix composites

“…These wear damages are usually in the form of micro-cracks or localized plastic deformation. Adhesive wear, abrasion wear, surface fatigue wear and corrosive wear are the types of wear possible [13]. The apparatus commonly used for measuring sliding friction and wear characteristics are Pin-on-Disc, Pin-on-Flat, Pin-on Cylinder, thrust washers, Pin-into-Bushing, Rectangular Flats on a Rotating Cylinder [13].…”

“…Shrivastava1 et al investigated on the tribological properties of silicon carbide-based aluminium metal network composite and aluminium lattice compound have been read for different sliding velocities of 3.14 and 3.77 m/s and load extend from 10 to 30N under dry, greased up, and idle gas (argon) condition [13]. Nail to circle tribometer were utilized for tests.…”

“…The composite was manufactured by mix throwing course by utilizing Al7075 compound as the network and 10% by weight silicon carbide as strengthened material. The estimation of coefficient of erosion is seen as most extreme if there should be an occurrence of latent condition in framework amalgam at sliding speed 3.77 m/s and least if there should be an occurrence of greased up condition in composite at sliding rate 3.14 m/s [13]. Wear rate increments with the typical burden and sliding rate and it is most extreme in latent state of framework amalgam at 30 N.…”

Influence of graphene and multi-walled carbon nanotube additives on tribological behaviour of lubricants

“…The surfactants are used to avoid the agglomeration of nanoparticles and to enhance the thermal stability of nanofluids (Das et al, 2017;Tiara et al, 2017). Furthermore, the thin lubricating film between moving surfaces contains nanoparticles that are broken in smaller particles and reorient themselves at high load and temperature condition and reduces the coefficient of friction (Shrivastava et al, 2017). In another study of (Cong Mao et al, 2014), the addition of Al2O3 nanoparticles in deionized water reduced the friction coefficient by 34.20% and worn out the weight of the workpiece by 43.40% as compared to pure deionized water.…”