Investigations on microstructure, mechanical, and tribological behaviour of AA 7075–xwt.% TiC composites for aerospace applications

Ramkumar, K.; Sivasankaran, S.; Al-Mufadi, Fahad A.; Siddharth, S.; Raghu, R.

doi:10.1016/j.acme.2018.12.003

Cited by 92 publications

(26 citation statements)

References 28 publications

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“…The grain structure of the unreinforced matrix is weaker, with a low resistance to deformation. 33 According to the law of wear, materials with higher hardness exhibit greater resistance to wear. In agreement, the inclusion of hard ceramic reinforcements increased the hardness and wear resistance of the composites.…”

Section: Resultsmentioning

confidence: 99%

“…Hard ceramic particles penetrate the surface of the steel counterface and extract the material by microcutting. 33,44 Peaks that correspond to carbide, nitride and boride in the respective composites illustrate the ceramic particles. Thus, the peaks corresponding to iron, oxygen and titanium compounds confirm the formation of tribolayer on the surface of the pins at higher normal and sliding speed.…”

Section: Resultsmentioning

confidence: 99%

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Tribological behaviour of AZ91D/ultra-high-temperature ceramic composites at room and elevated temperatures

Surendran

Gnanavelbabu

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this research work, the tribological behaviour of an AZ91D alloy and its composites reinforced with different titanium-based ultra-high-temperature ceramic particulates was investigated. Titanium-based ultra-high-temperature ceramic materials (5 wt%) such as titanium carbide, titanium boride and titanium nitride was used for the fabrication of three different composites, namely ATC, ATB and ATN, respectively. The proposed composites were prepared using a novel ultrasonic treatment-assisted stir-squeeze casting technique. Material characterization was performed using scanning electron microscopy and X-ray diffraction techniques. The porosity and hardness of the composites were determined prior to the wear test. In the pin-on-disc tribometer, the wear test was carried out at room temperature by varying the normal load (12.5–50 N) and the sliding speed (0.25–1 m/s). In addition, at a temperature of up to 200 °C, the tribological behaviour of the composites was assessed. The homogeneous distribution of ultra-high-temperature ceramic particles in the matrix was confirmed by the analysis of the microstructure using scanning electron microscopy images. The X-ray diffraction results showed that the reinforcement materials in the matrix were thermally stable. The hardness of the ATC, ATB and ATN was improved by approximately 31%, 33.8% and 29.6%, respectively. In comparison, at all wear testing conditions, ATB demonstrated superior tribological performance, while the performance of ATN was poor and ATC was moderate. Abrasion, oxidation and delamination were the wear mechanisms at room temperature. At elevated temperatures, oxidation, delamination, thermal softening and plastic deformation wear mechanisms were significant..

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tribological behaviour of AZ91D/ultra-high-temperature ceramic composites at room and elevated temperatures

Surendran

Gnanavelbabu

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Suresh et al 16,20 found reduction in both COF and wear rate with increasing weight percentages of nano-SiC reinforcement. Ramkumar et al 17 also found increased wear resistance in case of AA7075/TiC composites owing to effective bonding, dispersion strengthening, and enhancement in the strength of matrix. Also, COF and wear rate increased with increase in load and sliding speed.…”

Section: Introductionmentioning

confidence: 93%

“…have led to an improvement in the wear resistance of the AA7075 matrix. [9][10][11][12][13][14][15][16][17][18][19] Baradeswaran and Perumal 9 reported increased wear resistance with the incorporation of B 4 C particles in AA7075. Rajan et al 10 also found enhanced wear resistance in case of in situ cast AA7075/TiB 2 composites.…”

Section: Introductionmentioning

confidence: 99%

Tribological characteristics of AA7075 composites reinforced with rice husk ash and carbonized eggshells

Gupta

Singh

Mishra

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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This paper investigates dry sliding friction and wear behavior of AA7075 composites reinforced with rice husk ash and carbonized eggshells. Composites with varying weight percentages of rice husk ash and carbonized eggshells in the range of 0–5 wt.% were fabricated through stir-casting technique. Density, porosity content, and microhardness were computed before tribological testing. Friction and wear tests were conducted on pin-on-disc type tribometer at room temperature. The samples were tested at different loads (10–50 N) with constant speed of 1 m/s and constant sliding distance of 1500 m. Samples were also tested at different sliding speeds (3 and 5 m/s) with constant normal load of 30 N. The addition of natural reinforcements decreased the density of composites. Microhardness of sample having 5 wt% rice husk ash increased by 15.08% over base composition. Maximum wear resistance was shown by sample with 5 wt% rice husk ash. Highest coefficient of friction was shown by sample with 3.75 wt% rice husk ash and 1.25 wt% carbonized eggshells. Wear loss varied directly with increasing load and sliding speeds for all composites, whereas coefficient of friction increased with increasing load and decreased with increasing sliding speed for all composites. Delamination and ploughing are dominant wear mechanisms at low speed whereas ploughing is the dominant wear mechanism at high speed as depicted by scanning electron microscopic images of worn surfaces. Composites with improved wear-resistant properties can be used for different tribological applications particularly in automotive industry.

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“…Aluminum matrix composites can be applied to missile shells, light tank trackpads, armor piercing sabots, tank engine pistons, and other military products closely related to national security. [1][2][3][4][5] Pistons are one of the core components of engines, and their working conditions are severe bearing huge mechanical and thermal loads in internal combustion engines. Besides, as one of the most important friction pairs of internal combustion engines, pistons have an important influence on the reliability and mechanical efficiency of internal combustion engines.…”

Section: Introductionmentioning

confidence: 99%

Tribofilm formation on the VN/7075 composite surface under sulfur-containing boundary lubrication

Bai

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, Al7075 alloy and 15 wt% VN/7075 composite were prepared by ball milling and hot-press sintering. The microstructure, hardness, and wear behavior under different working conditions (environmental condition: dry friction, sulfur-containing boundary lubrication, and oil lubrication) were studied. The results showed that the distribution of VN was dispersive and uniform in 15 wt% VN/7075 composite without obvious agglomeration. The hardness (119.5 Hv) of 15 wt% VN/7075 composite was 46.1% higher than the Al7075 alloy (81.8 Hv). Friction and wear behavior test results showed that under sulfur-containing boundary lubrication condition, according to the tribofilm layer on the worn surface of 15 wt% VN/7075 composite, the friction coefficient of 15 wt% VN/7075 composite decreased by 37.6% compared with the Al7075 alloy. The main wear mechanism of 15 wt% VN/7075 composite was delamination wear and abrasive wear under dry friction, while under sulfur-containing boundary lubrication and oil lubrication, it changed to mild abrasive wear.

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Investigations on microstructure, mechanical, and tribological behaviour of AA 7075–xwt.% TiC composites for aerospace applications

Cited by 92 publications

References 28 publications

Tribological behaviour of AZ91D/ultra-high-temperature ceramic composites at room and elevated temperatures

Tribological behaviour of AZ91D/ultra-high-temperature ceramic composites at room and elevated temperatures

Tribological characteristics of AA7075 composites reinforced with rice husk ash and carbonized eggshells

Tribofilm formation on the VN/7075 composite surface under sulfur-containing boundary lubrication

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