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Patil, Shanawaz
- Effect of beryl and graphene nano platelets reinforcements on the wear behaviour of AL7075- beryl graphene particulate hybrid nano composites
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Authors
Affiliations
1 School of Mechanical Engineering, REVA University, Bengaluru 560 064, IN
2 Aerospae Engineering Department, King Abdulaziz University, Jeddah 21589, SA
3 Aircraft Research and Design Centre, HAL, Bangalore-560037, Karnataka, IN
1 School of Mechanical Engineering, REVA University, Bengaluru 560 064, IN
2 Aerospae Engineering Department, King Abdulaziz University, Jeddah 21589, SA
3 Aircraft Research and Design Centre, HAL, Bangalore-560037, Karnataka, IN
Source
Journal of Mines, Metals and Fuels, Vol 69, No 12A (2021), Pagination: 84-91Abstract
The effect of beryl particles and graphene nano platelets (GNPs) on the wear behaviour of Al7075-beryl-graphene hybrid composites has been studied. The hybrid composites were developed containing Al7075 matrix as matrix materials and 6 weight percentage of beryl and varying 0.5 to 2 weight percentage of graphene by using novel two step stir casting technique and wear behaviour of the newly developed hybrid composites were studied. The dry sliding wear studies conducted using a pin-on-disc tribo-tester under atmospheric conditions revealed that the wear loss of Al7075-beryl-graphene hybrid composites are lower than that of the matrix Al7075 alloy and further with increasing weight percentage of graphene decreased the wear loss of the hybrid composites. The wear studies also showed that the increase in load, sliding speed and sliding distance, the wear loss of the composites increased. The microstructure of the worn out surface revealed that a huge amount of plastic deformation appeared on the unreinforced Al7075 alloy when compared to the reinforced hybrid composites. The incorporation of beryl and graphene into Al7075 showed worn out surface that is not smooth and grooves, scratches and parallel lines were observed. The addition of beryl and GNPs into the matrix reduces erosion and small grooves like structure were noticed in the hybrid composites which leads to a reduction in wear in Al7075-beryl-GNPs hybrid compositesKeywords
Al7075, beryl, graphene, microstructure, wear
References
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- Effect of hydrogen embrittlement on the characteristics of copper-based shape memory alloy
Abstract Views :100 |
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Authors
Affiliations
1 Dept. of Mechanical Engg., Siddaganga Institute of Technology, Tumkur, Karnataka-572103, IN
2 Aircraft Research And Design Centre, HAL, Bangalore 560 037, IN
3 School of Mechanical Engineering, REVA University, Bangalore, Karnataka, IN
1 Dept. of Mechanical Engg., Siddaganga Institute of Technology, Tumkur, Karnataka-572103, IN
2 Aircraft Research And Design Centre, HAL, Bangalore 560 037, IN
3 School of Mechanical Engineering, REVA University, Bangalore, Karnataka, IN
Source
Journal of Mines, Metals and Fuels, Vol 69, No 12A (2021), Pagination: 159-162Abstract
Because of the good shape memory effect and superelasticity, copper-based shape memory alloys (SMAs) with aluminum and beryllium as binary and ternary elements are widely used in many applications (Cu-Al-Be SMAs). However, they are prone to corrosion in atmospheric conditions. This alloy is susceptible to corrosion due to hydrogen. This affects the characterization of the SMAs by absorbing the hydrogen and results in hydrogen embrittlement, makes changes in SME and SE effect. The process of hydrogen absorption was carried out under electrolytic charging under constant current density and the charged specimens were aged in the air at room temperature. The results show the decrement in SME from 99.8 % to 62%, and the tensile test revealed an increment in the transformation stress level from 200MPa-290MPa in the case of the charged specimen.Keywords
Shape memory alloy; Shape memory effect; Cu-Al-Be SMAs; hydrogen embrittlement; corrosion.References
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- Influence of micro graphite particles on the microstructure and wear behaviour of aluminium 6061 alloy composites developed by two step casting process
Abstract Views :103 |
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Authors
Affiliations
1 Aircraft Research and Design Centre, HAL, Bangalore 560037, IN
2 Department of Mechanical Engineering, Siddaganga Institute of Technology, Tumkur 572103, IN
3 School of Mechanical Engineering, Reva University, Bangalore 560064, IN
4 Department of Mechanical Engineering, KNS Institute of Technology, Bangalore, IN
5 Department of Mechanical Engineering, APS Polytechnic, Bangalore, Karnataka, IN
1 Aircraft Research and Design Centre, HAL, Bangalore 560037, IN
2 Department of Mechanical Engineering, Siddaganga Institute of Technology, Tumkur 572103, IN
3 School of Mechanical Engineering, Reva University, Bangalore 560064, IN
4 Department of Mechanical Engineering, KNS Institute of Technology, Bangalore, IN
5 Department of Mechanical Engineering, APS Polytechnic, Bangalore, Karnataka, IN
Source
Journal of Mines, Metals and Fuels, Vol 69, No 12A (2021), Pagination: 199-206Abstract
In the present research, the effect of micron sized graphite addition on the microstructure and wear behaviour of Al6061 alloy has been studied. The Al6061 alloy metal matrix composites reinforced with 6, 9 and 12 varying wt.% of graphite particles were fabricated by novel two step stir cast route which helps in improving the wettability of Al6061 alloy matrix with graphite particles. The created composites were exposed to microstructural studies and wear properties evaluation. Microstructural characterizations of achieved samples were carried out by SEM microscopy, EDS and XRD patterns. The occurrence of graphite particles were confirmed by the XRD patterns. The wear behaviour of Al6061 alloy with 6, 9 and 12 weight percentages of graphite composites were evaluated using pin on disc wear apparatus. All the experiments were conducted by varying applied loads of 1, 3 and 5 kg at 400 rpm sliding speed and varying sliding speeds of 100, 200, 400 and 600 rpm at 5 kg constant load. Wear mechanisms were studied by using SEM micrographs of worn surfaces and wear debris.Keywords
Al6061 alloy, graphite particles, microstructure, wear, worn surface, wear debrisReferences
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- Madeva Nagaral, V Auradi, S A Kori, Vijayakumar Hiremath, (2019): “Investigations on mechanical and wear behaviour of nano Al2O3 particulates reinforced AA7475 alloy composites”, Journal of Mechanical Engineering and Sciences, 13, 1, pp. 4623-4635.
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