Effect of matrix powder and reinforcement content on tribological behavior of particulate 6061Al-TiB₂ composites

Abstract

In the present work, 6061Al-TiB2 composites were synthesized using two types of base 6061Al powder (prealloyed and premixed) through powder metallurgy route. Dry sliding wear test was performed on the specimens using pin on disk apparatus to investigate the effect of TiB2 content on tribological characteristics. The microstructure, worn surface, and subsurface were also characterized using scanning electron microscope to examine the wear mechanism of prealloyed- and premixed-based composites. A mathematical model was developed using parameters (composition and applied load) to predict wear rate and correlated with experimental results. Adequacy of developed model has been validated using analysis of variance. Results indicated that premixed 6061Al-TiB2 composites have superior tribological properties as compared to the prealloyed 6061Al-TiB2 composite.

Spark Plasma Sintering and Characterization of Al-TiB2 Composites

“…Porosity was decreased while the uniformity was increased by increasing the temperature from 500 • C to 550 • C due to an increase in sintered density. Compared with other (Mahesh Paidpilli [35], V. Jaya Prasad [36], Z.Sadeghian [20]) Al-TiB 2 composite microstructures, TiB 2 particles were not clearly visible in the current work microstructures.…”

“…The movement of dislocations under load was stopped by reinforcement particles and a hence substantial increase in tensile strength. As the TiB 2 volume increased in the matrix, the ductility was decreased due to the TiB 2 particles inhibiting the plastic flow [35]. A comparison (Table 4 shows a comparison of the tensile strength of the current work with other works with the other works (Selvaganesan M [42] Johny James.…”

“…The strength of the MMC proliferates due to Orowan's mechanism, which allows the TiB 2 particulates to become obstacles to the migration of dislocations [38,39]. During SPS, hard and brittle TiB 2 particles restrict local rearrangement and plastic deformation of aluminum particles [35]. Furthermore, pre-alloyed 6061 Al powders are harder due to solid solution strengthening during processing, and the presence of the TiB 2 reinforcement particles in the matrix increases the hardness [40].…”

“…Reinforcements like ZrSiO 4 , B 4 C, TiB 2 , and SiC are used to ameliorate the hardness and wear resistance of MMCs without considerably changing the density of the material [9][10][11][12][13][14][15][16]. Among these, TiB 2 has emerged as a good reinforcement due to its outstanding features such as thermal stability, oxidation resistance, high melting point (3225 • C), and exceptional hardness (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35) Vickers at room temperature). It is chemically stable for a wide range of temperatures, high modulus, and has good electrical conductivity [17].…”

Effect of Al2O3 nanoparticles on the mechanical behaviour of aluminium-based metal matrix composite synthesized via powder metallurgy

“…13 The PM-based fabrication process of MMCs initially mixes the metal and nanoparticle powders followed by cold or hot compaction and sintering. 14,15 The process parameters are selected based on the reinforcement particle size, their weight fraction, and distribution in the matrix. The smaller size nanoparticles are preferred in engineering applications due to their wide reach in the matrix and interfacial bonding with a matrix which helps in achieving uniform and homogenous static and wear properties of the MMCs.…”