Dry sliding wear properties of unhybrid and hybrid Al alloy based nanocomposites

Kumar, Navneet; Prabhu, T. Ram; Shankar, G.S. Shiva; Basavarajappa, S.

doi:10.1080/17515831.2016.1247132

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…Most of the brake material studies on MMCs are Fe, Cu, Ni, Mg or Al-based MMCs with uniform size particle reinforcements. 12,[14][15][16][17][18][19][20][21][22][23][24][25] The factors influencing the wear and friction of MMCs are usually classified into two groups, one is the material and process parameters e.g. size, shape, volume fraction and size distribution of the particles, interface bonding strength, matrix type, type of processing and heat treatment, and other one is the testing conditions e.g.…”

Section: Introductionmentioning

confidence: 99%

Effect of bimodal size particles reinforcement on the wear, friction and mechanical properties of brake composites

Prabhu

2016

Tribology - Materials, Surfaces & Interfaces

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Novel bimodal size ranges of ceramic particles (SiC (115 μm)and SiO 2 (1.2 μm) (labelled as SIL)), SiC (115 μm) and mullite (4 μm) (labelled as MUL)) iron matrix composite structures were processed by powder metallurgy. The physical, mechanical and tribological properties were evaluated for these composites. The dry sliding wear and friction tests were conducted at ambient temperature and 60% humidity in a laboratory scale dynamometer for braking material applications. We have selected four braking speeds (5, 10, 15 and 20 m/s) and two braking loads (100 and 200 N) to cover the broad spectrum of braking conditions experienced in a typical automobile and military aircrafts. The particle morphology, microstructure, wear surface morphology and mechanisms were discussed based on the scanning electron microscopy equipped with energy-dispersive spectroscopy, optical microscope and stereoscope examinations. Our work provides the following important results: (1) bimodal particle structure composites can be easily fabricated using powder metallurgy, (2) the wear resistance and the braking performance of bimodal particle-reinforced composites is superior than the typical automobile asbestos or non asbestos, metallic, semi-metallic and Al/SiC composites based brake materials, (3) Between mullite and silica reinforcements, the mullite-reinforced bimodal composite (MUL) provides higher wear resistance, braking performance (high friction coefficient, stopping distance, stopping time), higher flexural strength, stiffness and hardness. These improvements are attributed to the better powder consolidation, high elastic modulus of mullite and better distribution of mullite in the iron matrix, (4) Increasing sliding speed decreases the wear rate and increases the friction coefficient in the MUL composites, whereas the variations in the wear rate and the friction coefficient are random in the SIL composites and (5) the combined effects of abrasive, delamination, oxidation and tribofilm-controlled wear mechanisms are observed to be operative at all sliding speeds and load conditions for both the composites.

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Section: Introductionmentioning

confidence: 99%

Effect of bimodal size particles reinforcement on the wear, friction and mechanical properties of brake composites

Prabhu

2016

Tribology - Materials, Surfaces & Interfaces

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“…Despite the fact that the traditional method of experiment design necessitates extensive resource consumption, assessing the combined effects of applicable components is difficult. In previous work [20], a thorough explanation of factor selection was provided, and it was concluded that, of the four factors considered, sliding speed has the least effect on wear rate. As a result, the least significant factor was removed from the current work, and because this work focuses on the influence of ageing temperature on wear behavior, it was decided to consider the important factors as load, sliding distance, and ageing temperature.…”

Section: Response Surface Methodologymentioning

confidence: 99%

“…Heat-treated composites have higher hardness when compared to unheated composites. The reason for this could be that a much harder intermetallic phase has formed, and ice quenching improves composite hardness by stabilizing the intermetallic phase [20]. Both quenching conditions resulted in changes in wear resistance.…”

Section: Optimizationmentioning

confidence: 99%

“…The aluminum alloy AA2219 is frequently used in rocket fuel tanks and airframe contact components due to its higher specific strength and stiffness, exceptional formability and fracture toughness, excellent cryogenic qualities, and great weldability [18]. Because of their high impact resistance, superior wear resistance, elevated melting point (2450 °C), and low density, B4C nano particles form a reinforcement phase added to AA2219 to improve wear performance [19][20]. Only a few studies have been conducted on B4C, the third hardest material, and its effects on Al alloy.…”

Section: Introductionmentioning

confidence: 99%

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Optimization and analysis of dry sliding wear behaviour of N-B4C/MOS2 unreinforced AA2219 nano hybrid composites using response surface methodology

Chitwadgi¹,

Siddesh²,

Shankar³

et al. 2022

Metall Mater Eng

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The effect of heat treatment on nano-size B4C particle reinforced hybrid composites is discussed in this paper. For this, hybrid reinforced AA2219 composites with 2% by weight nano B4C and 2% by weight MoS2 particulates were fabricated using a two-stage stir casting process, and the specimens were heat treated to assess their influence on wear behavior. Experiments were carried out to study the wear behavior by varying important factors such as aging temperature, load, and sliding distance. Response Surface Methodology (RSM) designed by Box-Behnken was used to identify the critical variables influencing wear rate and optimize wear behavior. To comprehend the wear mechanisms involved, an analysis of the worn surface was presented. Based on the analysis, a regression equation with a predictability of 97.2% was developed for the response to obtain the optimum wear rate. The following order effectively captures the relative importance of the various factors determining the alloy's wear resistance: sliding distance, load, and aging temperature. When compared to load and sliding distance, heat treatments via artificial aging in the temperature range of 200-240 °C have no significant effect on the wear resistance of hybrid AA2219 composites reinforced with n-B4C and MoS2 particulates. However, when a temperature range of 200-240 °C is considered, composites exhibit better wear resistance at the aging temperature of 240 °C with ice quenching.

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“…Dry condition sliding wear behavior of Al/B 4 C nanocomposites produced by mechanical milling and hot pressing [17], milling and hot extrusion [18,19], friction stir processing [20], stir casting [21] and ultrasonic assisted stir casting [22][23][24] are the few studies reported. Sharifi et al [17] produced Al-B 4 C bulk nanocomposites by ball milling and hot pressing method.…”

Section: Introductionmentioning

confidence: 99%

Dry sliding wear behavior of ultrasonic stir cast boron carbide reinforced aluminium nanocomposites

Shinde

Poria²,

Sahoo

2020

Surf. Topogr.: Metrol. Prop.

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In the present work ultrasonic stir casting method is used to fabricate aluminium metal matrix nanocomposites reinforced with nano boron carbide (nB 4 C) particles with varying (0.5, 1, 1.5 and 2) weight percentages. Microhardness and nanoindentaion hardness of the nanocomposite is found to increase with increasing reinforcement content. Pin on disk apparatus is used to study the room temperature dry sliding wear behavior of fabricated composites and base alloy. Nominal contact pressures of 0.354-1.412 MPa and sliding speeds of 0.16-0.66 m s −1 are employed. Each test run is conducted for the fixed contact period of 15 min. Field emission scanning electron microscopy (FESEM) equipped with energy dispersive spectroscopy (EDS) is used to observe worn surface and wear debris to understand the undergoing wear mechanisms. It is observed that base alloy underwent mild to severe plastic deformation led oxidative delamination wear. Nanocomposites are subjected to combination of oxidative, abrasive and mild delamination wear. Nanocomposites display less mass loss and wear rate as compared to base alloy due to the protective tribolayer formed in the contact interface. Part of the mechanically mixed transfer layer is found to adhere firmly to the composite surface under higher load-speed condition. Extremely hard nB 4 C particle reinforcement is found beneficial for improving the wear resistance of aluminium alloy at varying combinations of load and speed.

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Dry sliding wear properties of unhybrid and hybrid Al alloy based nanocomposites

Cited by 16 publications

References 32 publications

Effect of bimodal size particles reinforcement on the wear, friction and mechanical properties of brake composites

Effect of bimodal size particles reinforcement on the wear, friction and mechanical properties of brake composites

Optimization and analysis of dry sliding wear behaviour of N-B4C/MOS2 unreinforced AA2219 nano hybrid composites using response surface methodology

Dry sliding wear behavior of ultrasonic stir cast boron carbide reinforced aluminium nanocomposites

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