Wear behavior of high volume Al₂O₃-reinforced Al7075 matrix composites fabricated by semi-solid powder processing

Abstract

The aim of the present study is to fabricate high volume Al2O3-reinforced Al7075 matrix composite by semi-solid powder processing method as an effective method to achieve the desired wear properties. The alloy powder (20 µm) was mixed with Al2O3 (120 µm) for 10 min and 5 h by planetary ball mill to overcome the powders agglomeration. The wear behavior of the composites was studied using the pin-on-disk tribometer. The effects of milling time, compact pressure, and reinforcement content were investigated to enhance the wear resistance. The results of the tribotests indicated that composites with coarser reinforcing particles (lower milling time) have good wear resistance. The role of compaction pressure in highly loaded composites is remarkable. The maximum wear resistance was observed for the 50% Al2O3 composite. The wear resistance increased as the reinforcement volume increased before reaching a critical value. Abrasive wear is the predominant mechanism in the wear of reinforced composites containing less than the load limit. However, adhesive and laminating wear are the controlling mechanisms at overloads. The results indicate valuable information in the development of aluminum-based composites.

The Effect of Powder Temperature on Semi-Solid Powder Rolling AA2024 Based on Experiments and Numerical Simulation

“…When the powder temperature is 580 • C, the grains are obviously refined and the large particles are basically invisible in Figure 5d. The liquid phase is distributed mainly on the grain boundary [29], and pores are in the form of micropores between grains. This is because the liquid fraction at 580 • C increases significantly, which is 12.1% in Figure 1b.…”

Tribological aspects of magnesium matrix composites: A review of recent experimental studies

“…The authors reported that a significant amount of Mg and O was detected for the EDS analysis. This shows the oxidation of the Mg matrix during the wear test [130]. It can be seen that the wear debris of the composite is finer than that of unreinforced alloy.…”

“…The authors reported that the agglomeration of CNT deteriorated the tribological performance. The agglomeration of reinforcement particles leads to abrasion, in which the counterface ploughs the sample and forms debris [130].…”

“…The authors reported that the agglomeration of CNT deteriorated the tribological performance. The agglomeration of reinforcement particles leads to abrasion, in which the counterface ploughs the sample and forms debris [130].

Figure 30 SEM images of worn surface of (a) 10B 4 C, (b) 10B 4 C/0.1MWCNTs, (c) 10B 4 C/0.5 MWCNTs and (d) 20B 4 C/0.5MWCNTs under load of 80 N and speed of 0.5 m/s [68].

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Effect of milling time on microstructure and hardness of AA7075-15 wt% SiC-1 wt% MWCNT nanocomposite

“…With the developments in nanotechnology in recent years, composite materials have been produced by using reinforcements such as SiC, [2][3][4] Al 2 O 3 , [5][6][7] ZrO 2 , 8-10 TiB 2 , [11][12][13] graphene nano plate (GNP), [14][15][16] and carbon nanotube (CNT) [17][18][19] in nano sizes. Carbon nanotubes (CNTs) have many outstanding material characteristics such as high surface-to-volume ratio, high tensile strength, high thermal conductivity, and low density.…”