The Impact of nanoparticles (B4C-Al2O3) on mechanical, wear, fracture behavior and machining properties of formwork grade Al7075 composites
This study explores how ageing temperature and the volume percentage of Al2O3+B4C nanoparticles influence the machinability and hardness of stir-cast Al-7075 Metal Matrix Composite (MMC). Using liquid metallurgy techniques, hybrid materials were created by reinforcing Al7075 metal matrix with varyi...
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Gruppo Italiano Frattura
2024-05-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/4938 |
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| author | T. B. Prakash M. Gangadharappa Santhosh Somashekar M. Ravikumar |
| author_facet | T. B. Prakash M. Gangadharappa Santhosh Somashekar M. Ravikumar |
| author_sort | T. B. Prakash |
| collection | DOAJ |
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This study explores how ageing temperature and the volume percentage of Al2O3+B4C nanoparticles influence the machinability and hardness of stir-cast Al-7075 Metal Matrix Composite (MMC). Using liquid metallurgy techniques, hybrid materials were created by reinforcing Al7075 metal matrix with varying weight percentages of nanosized B4C (1.5%, 3%, and 4.5%) and Al2O3 (1%, 1.5%, and 2%). After fabrication, the samples were subjected to five-hour ageing process at temperatures of 100, 120, and 140 degrees Celsius, followed by cooling to ambient temperature (27 degrees Celsius). Hybrid nano composites that had been heat treated were tested for wear, tensile strength, and hardness. Results shows that, the addition of nanoparticles and heat treatment considerably improves the tensile strength, hardness, and wear resistance of hybrid composites by 3%, 17%, and 10%, respectively, for samples reinforced with 4.5% B4C + 2% Al2O3. SEM analysis was used to investigate the type of wear and the tensile fracture mode of nano composite samples by analyzing the wornout surface and the surface where tensile fracture occurred. Machinability was assessed using L27 orthogonal array tests, focusing on three key process parameters: feed rate (0.1 mm/min), depth of cut (0.2 mm/min), and spindle speed (1000 rpm). Outcomes show that, increasing the wt. % of nano-Al2O3/B4C leads to higher machining force and surface roughness (Ra) of MMCs. Conversely, higher ageing temperatures result in decreased machining force and surface roughness. Optimal surface roughness and machining force were achieved with 1% Al2O3 + 1.5% B4C and an ageing temperature of 140°C. These findings offer valuable insights into the ease of machining of composite metal alloys, emphasizing the importance of parameter selection and optimization for desired machining outcomes.
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| format | Article |
| id | doaj-art-df2c28c6e0ac4f27b8f897b4d9e874a0 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2024-05-01 |
| publisher | Gruppo Italiano Frattura |
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| series | Fracture and Structural Integrity |
| spelling | doaj-art-df2c28c6e0ac4f27b8f897b4d9e874a02025-01-03T01:01:41ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932024-05-011869The Impact of nanoparticles (B4C-Al2O3) on mechanical, wear, fracture behavior and machining properties of formwork grade Al7075 compositesT. B. Prakash0M. Gangadharappa1Santhosh Somashekar2https://orcid.org/0009-0000-1640-3179M. Ravikumar3https://orcid.org/0000-0002-4958-839XDepartment of Civil Engineering, B M S Evening College of Engineering, Bangalore, Karnataka, India Graphite India Limited, Bangalore, Karnataka, IndiaDepartment of Mechanical Engineering, B M S College of Engineering, Bangalore, Karnataka, India Dept. of Mechanical Engineering, B M S College of Engineering, Karnataka 560019, India This study explores how ageing temperature and the volume percentage of Al2O3+B4C nanoparticles influence the machinability and hardness of stir-cast Al-7075 Metal Matrix Composite (MMC). Using liquid metallurgy techniques, hybrid materials were created by reinforcing Al7075 metal matrix with varying weight percentages of nanosized B4C (1.5%, 3%, and 4.5%) and Al2O3 (1%, 1.5%, and 2%). After fabrication, the samples were subjected to five-hour ageing process at temperatures of 100, 120, and 140 degrees Celsius, followed by cooling to ambient temperature (27 degrees Celsius). Hybrid nano composites that had been heat treated were tested for wear, tensile strength, and hardness. Results shows that, the addition of nanoparticles and heat treatment considerably improves the tensile strength, hardness, and wear resistance of hybrid composites by 3%, 17%, and 10%, respectively, for samples reinforced with 4.5% B4C + 2% Al2O3. SEM analysis was used to investigate the type of wear and the tensile fracture mode of nano composite samples by analyzing the wornout surface and the surface where tensile fracture occurred. Machinability was assessed using L27 orthogonal array tests, focusing on three key process parameters: feed rate (0.1 mm/min), depth of cut (0.2 mm/min), and spindle speed (1000 rpm). Outcomes show that, increasing the wt. % of nano-Al2O3/B4C leads to higher machining force and surface roughness (Ra) of MMCs. Conversely, higher ageing temperatures result in decreased machining force and surface roughness. Optimal surface roughness and machining force were achieved with 1% Al2O3 + 1.5% B4C and an ageing temperature of 140°C. These findings offer valuable insights into the ease of machining of composite metal alloys, emphasizing the importance of parameter selection and optimization for desired machining outcomes. https://www.fracturae.com/index.php/fis/article/view/4938Hybrid nano CompositeStircastingMechanicalWearFracture surfaceMachining force |
| spellingShingle | T. B. Prakash M. Gangadharappa Santhosh Somashekar M. Ravikumar The Impact of nanoparticles (B4C-Al2O3) on mechanical, wear, fracture behavior and machining properties of formwork grade Al7075 composites Fracture and Structural Integrity Hybrid nano Composite Stircasting Mechanical Wear Fracture surface Machining force |
| title | The Impact of nanoparticles (B4C-Al2O3) on mechanical, wear, fracture behavior and machining properties of formwork grade Al7075 composites |
| title_full | The Impact of nanoparticles (B4C-Al2O3) on mechanical, wear, fracture behavior and machining properties of formwork grade Al7075 composites |
| title_fullStr | The Impact of nanoparticles (B4C-Al2O3) on mechanical, wear, fracture behavior and machining properties of formwork grade Al7075 composites |
| title_full_unstemmed | The Impact of nanoparticles (B4C-Al2O3) on mechanical, wear, fracture behavior and machining properties of formwork grade Al7075 composites |
| title_short | The Impact of nanoparticles (B4C-Al2O3) on mechanical, wear, fracture behavior and machining properties of formwork grade Al7075 composites |
| title_sort | impact of nanoparticles b4c al2o3 on mechanical wear fracture behavior and machining properties of formwork grade al7075 composites |
| topic | Hybrid nano Composite Stircasting Mechanical Wear Fracture surface Machining force |
| url | https://www.fracturae.com/index.php/fis/article/view/4938 |
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