Evaluation of mechanical properties of Al7075-SiC composites fabricated through stir casting technique

Raghuvaran, P.; Baskaran, J.; Aagash, C.; Ganesh, A. Sri; Krishna, Sri

doi:10.1016/j.matpr.2020.09.191

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…Al 7075 is used as matrix material for the present study. The composition of Al7075 is given in Table 1 [24]. Silicon Carbide particles measuring around 30 µm is used as reinforcement.…”

Section: Methodsmentioning

confidence: 99%

Effect of Shot Peening and Heat Treatment on Fatigue Strength and Microstructure of Stir Casted Al7075-SiC Composites

2022

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Aluminium matrix composites are analyzed by many researches already to improve the properties such as wear, hardness, tensile and compressive strengths in order to use it for automobile, aircraft and other applications. Limited attempts were taken to improve the cyclic load carrying capacity of these materials. The present study focuses on improving the fatigue strength of Al7075 composite reinforced with SiC particles. 8 vol.% of SiC is used as reinforcement to produce composite specimens. Stir casting, an economic and best chosen method, is employed to produce composite samples. A portion of the casted samples are machined to ASTM standards and heat treated to T6 conditions. Shot peening is carried out using steel shots on some of the heat treated and non-heat treated composite specimens. Almen strip test is conducted earlier to predict the peening time. High cycle fatigue tests are conducted on heat treated shot peened samples and are compared with Al7075 and composites at as cast, heat treated non-shot peened and shot peened non-heat treated conditions. Improvement of around 6% is found for heat treated shot peened samples than that of Al7075. Microstructural analysis revealed the surface modifications because of shot peening and heat treatment.

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“…Al 7075 is used as matrix material for the present study. The composition of Al7075 is given in Table 1 [24]. Silicon Carbide particles measuring around 30 µm is used as reinforcement.…”

Section: Methodsmentioning

confidence: 99%

Effect of Shot Peening and Heat Treatment on Fatigue Strength and Microstructure of Stir Casted Al7075-SiC Composites

2022

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“…8 wt% of SiC particles, with an average size of 30 μm, are used as reinforcement material. Table 1 provides the composition [19] of Al7075, indicating the presence of different elements in varying amounts. 'A' type Almen strip is used for the Almen strip test.…”

Section: Experimental Details 21 Materialsmentioning

confidence: 99%

Enhancing the fatigue strength of stir-casted Al7075-SiC composites through heat treatment and shot peening

Raghuvaran,

Suresh,

Narasimharaj

et al. 2023

Phys. Scr.

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An attempt has been made in the present study to analyze the impact of shot peening on fatigue strength of Al-SiC (8 wt.%) composites. Composite samples prepared using stir casting method is machined to ASTM E466 standards and a portion of them are exposed to T6 heat treatments. Shot peening is done on various combinations of specimens and fatigue tests are carried out and compared. Fatigue strength of Al7075 is 156.5 MPa and it is found to be increased to 165.8 MPa for heat treated and shot peened Al-SiC composites. Design expert software is used for design of experiments in order to optimize the process parameters and enhance the fatigue strength of the specimens further. Fatigue strength of the specimens was increased to 174 MPa on repeating the test with optimized experimental parameters. The fatigue test results revealed that heat treated cum shot peened Al-SiC composite exhibited maximum results than other samples. Surface residual stress of the specimens are measured and is found that shot peening increases the compressive residual stress on the surface of the specimen. Surface roughness of the specimen is increased on shot peening. Microstructural analysis is done on the specimens to find the impact of shot peening on the surface of the composite specimens. The strengthening mechanisms of the composite samples are discussed with the help of microstructural images.

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“…During this process, the reinforcement precursors could be added from outside or generated from an in situ reaction. [ 6 ] However, in terms of the stir casting technique, due to the poor wettability and density difference between the ceramic particles and aluminum, the poor dispersion uniformity of these particles in the molten melts will deteriorate the service performance (such as the strength, toughness, and hardness) of the AMCs. Several reports [ 7,8 ] indicated that factors such as the fluid field of the melts in the stir tank and the delivering way of particles precursors are dominant to the distribution of reinforcements.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Stirring Velocity and the SiO₂ Precursor Particles Feeding Rate on the Microstructure of the Al₂O₃/SiO₂/Al Composites Prepared via Stir Casting Process

et al. 2022

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Evaluation of mechanical properties of Al7075-SiC composites fabricated through stir casting technique

Cited by 16 publications

References 26 publications

Effect of Shot Peening and Heat Treatment on Fatigue Strength and Microstructure of Stir Casted Al7075-SiC Composites

Effect of Shot Peening and Heat Treatment on Fatigue Strength and Microstructure of Stir Casted Al7075-SiC Composites

Enhancing the fatigue strength of stir-casted Al7075-SiC composites through heat treatment and shot peening

Effect of the Stirring Velocity and the SiO₂ Precursor Particles Feeding Rate on the Microstructure of the Al₂O₃/SiO₂/Al Composites Prepared via Stir Casting Process

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Evaluation of mechanical properties of Al7075-SiC composites fabricated through stir casting technique

Cited by 16 publications

References 26 publications

Effect of Shot Peening and Heat Treatment on Fatigue Strength and Microstructure of Stir Casted Al7075-SiC Composites

Effect of Shot Peening and Heat Treatment on Fatigue Strength and Microstructure of Stir Casted Al7075-SiC Composites

Enhancing the fatigue strength of stir-casted Al7075-SiC composites through heat treatment and shot peening

Effect of the Stirring Velocity and the SiO2 Precursor Particles Feeding Rate on the Microstructure of the Al2O3/SiO2/Al Composites Prepared via Stir Casting Process

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Effect of the Stirring Velocity and the SiO₂ Precursor Particles Feeding Rate on the Microstructure of the Al₂O₃/SiO₂/Al Composites Prepared via Stir Casting Process