Investigations on micro hardness, electrical and thermal conductivity of AA7075 surface hybrid composites produced through friction stir processing

Suganeswaran, K.; Parameshwaran, R.; Thangavel, Sivasakthivel; Nithyavathy, N.; Sivasakthivel, T.

doi:10.1088/2053-1591/ab47e3

Cited by 15 publications

(6 citation statements)

References 41 publications

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“…It is noted that the presence of the excitation level of the free electrons and phonons in the matrix alloy has a significant impact on thermal conductivity. 43 In the case of FSPed base Mg alloy, the intense plastic deformation produced by rotating FSP leads to evolutions in grain sizes and increases the number of grain boundaries. It tends to decrease thermal conductivity by scattering and creating obstacles in the way of free electrons and phonons.…”

Section: Resultsmentioning

confidence: 99%

Exploring the mechanical, metallurgical, and fracture characteristics of hybrid-reinforced magnesium metal matrix composite synthesized via friction stir processing route

Sagar,

Handa

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Low-cost hybrid-reinforced magnesium metal matrix composite (HMMC) materials present a revolutionary category of materials achieved by combining two or more distinct reinforcing elements within the magnesium (Mg) matrix. The main focus of this research is to fabricate Mg-based HMMCs with exceptional mechanical and other characteristics by utilizing Mg substrate AZ61A as the base material. To achieve this, nano-titanium carbide (TiC), nano-silicon carbide (SiC), and fly ash (FA) were selected as hybrid reinforcements, and the friction stir processing technique was employed for their incorporation. The microstructural, thermal, mechanical, wear, and fracture properties of synthesized HMMCs were carefully examined using a conventional testing approach. The findings demonstrate that the grain size of the base AZ61A alloy was measured at 32 µm, whereas the AZ61A/FA/TiC/SiC composite exhibited a remarkable reduction to 3.5 µm. Notably, this reduction in grain size leads to simultaneous enhancement in mechanical properties. The microhardness, ultimate tensile strength, and ultimate compressive strength of the developed HMMC showed an impressive increase, measuring 2.09 times, 2.75 times, and 2.10 times higher, respectively, compared to their initial values of the base material. Moreover, a significant enhancement in wear resistance was also observed, attributed to the increased hardness and homogenous hybrid reinforcement dispersion into the HMMCs. In addition, it was evident that the synergistic combination of different reinforcement particulates in Mg-based alloy improves overall fracture resistance and catastrophic failure and mitigates crack propagation.

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Section: Resultsmentioning

confidence: 99%

Exploring the mechanical, metallurgical, and fracture characteristics of hybrid-reinforced magnesium metal matrix composite synthesized via friction stir processing route

Sagar,

Handa

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Fine grain size increases the hardness of the SCs based on Hall petch relation. Dispersion strengthening [36][37][38] and hindering dislocation mechanism by emery and FA reinforcements [39][40][41] is also accountable for the increased hardness. Difference in thermal expansion coefficient values of the reinforcement particulates and parent matrix brings quench hardening effect into action.…”

Section: Microhardnessmentioning

confidence: 97%

Influence of Fly Ash and Emery based particulate reinforced AA7075 surface composite processed through friction stir processing

Suganeswaran

Parameshwaran

Sathiskumar³

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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The novel friction stir technology is adopted in modern automotive industries to meet the desired properties like hardness, impact toughness and tribological behaviour over the conventional techniques like stir casting, compo casting, squeeze casting, electroplating and infiltration methods. AA7075 surface composites fabricated with different volume fractions of fly ash and emery particles is said to enhance the aforementioned properties. The composites are processed through friction stir process (rotational speed −1200 rpm, transverse speed – 56 mm/min, tool tilt angle – 2 °). During characterization, the Microstructural examination of surface composites depicts fine and homogenous distribution of reinforcements in the friction stir process region owing to severe plastic deformation and dynamic recrystallization process. Substantially, good interface is formed between the reinforcement particulates and base substrate. Inclusion of Fe3O4, Al2O3 and SiO2 constituents through fly ash and emery reinforcements associated with the homogenous dispersion strengthening mechanism favours for the superior hardness of surface hybrid composite specimen 50E50FA. Decremented grain size and load bearing capacity of the reinforcements is beneficial for the crack propagation resistance that enhances the impact toughness behaviour (17.4 J/cm2) of the same specimen. Wear rate of the specimens are evaluated through pin on disc tribometer. The decrease in the wear rate of hard specimen 50E50FA is observed due to the reduced contact area between its surface and counter disc. The morphology of worn specimens using SEM analysis shows the combined abrasive and adhesive wear as the worn mechanism.

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“…It reveals that the hardness of 90% B 4 C reinforced sample I record a high value of 191Hv as compared to 136Hv of the base metal. This is because of the homogeneous dispersion of reinforcements in the composite zone [44,45]. Hybrid sample III, sample IV, and sample V record their maximum hardness values as 184Hv, 177Hv, and 171Hv respectively.…”

Section: Microhardnessmentioning

confidence: 99%

Optimization and effect of B₄C/Al₂O₃ with graphite particulates on tribological properties of Al7075 surface hybrid nanocomposite

Gobikannan¹,

Gopalakannan²,

Balasubramanian³

2022

Surf. Topogr.: Metrol. Prop.

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Aluminium alloy surface hybrid nanocomposite, reinforced with boron carbide (B4C), aluminium oxide (Al2O3), and Graphite (Gr) at different combination mixtures by weight ratio have been fabricated on Al7075-T6 aluminium plate by employing friction stir processing (FSP). The mixtures of definite proportions were packed in an array of blind holes 2.5mm in diameter and 3mm deep which are 6mm apart from each other. FSP was done with processing factors of 750 rpm revolving speed, 20mm/min feed, and tool angle of 3o. The prepared hybrid composites were sectioned for microstructure, macrostructure, wear, and hardness evaluation. In the metal matrix surface composite, the scanning electron microscope (SEM) and field emission scanning electron microscope (FESEM) depict the homogeneity in the distribution of reinforcement elements, microstructure, and wear behaviour. Under dry sliding conditions, the nanocomposite's wear behaviour was investigated by adopting a central composite design (CCD) at 3 levels in response surface methodology (RSM) for optimization. The wear characteristics are analyzed using pin on disc apparatus. The wear property of the nanocomposites with distinct reinforcement ratios was evaluated. Higher hardness values (maximum of 191Hv) were found in hybrid nanocomposite samples than in the plain FSPed samples (149Hv) without reinforcement. It is evident, that the wear loss depends on the relative weight ratio of B4C and Al2O3 with a constant amount of graphite and the minimum wear loss of 2.9421mm3 is obtained from composite with 30B4C+60Al2O3+10Gr reinforcement ratio than the wear loss of 8.2292mm3 obtained from plain FSPed composite. The optimal combination of parameters, Al2O3 60%, load 20N, and velocity 1 m/s was identified from RSM. The hybrid nanocomposite having a reinforcement mixture of 30B4C+60Al2O3+10Gr exhibits a significant wear resistance than other combination ratios. This is endorsed by the enhancement in binding strength of the matrix and the pinning effect of hard reinforcements, which act against the applied shear force.

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Investigations on micro hardness, electrical and thermal conductivity of AA7075 surface hybrid composites produced through friction stir processing

Cited by 15 publications

References 41 publications

Exploring the mechanical, metallurgical, and fracture characteristics of hybrid-reinforced magnesium metal matrix composite synthesized via friction stir processing route

Exploring the mechanical, metallurgical, and fracture characteristics of hybrid-reinforced magnesium metal matrix composite synthesized via friction stir processing route

Influence of Fly Ash and Emery based particulate reinforced AA7075 surface composite processed through friction stir processing

Optimization and effect of B₄C/Al₂O₃ with graphite particulates on tribological properties of Al7075 surface hybrid nanocomposite

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Investigations on micro hardness, electrical and thermal conductivity of AA7075 surface hybrid composites produced through friction stir processing

Cited by 15 publications

References 41 publications

Exploring the mechanical, metallurgical, and fracture characteristics of hybrid-reinforced magnesium metal matrix composite synthesized via friction stir processing route

Exploring the mechanical, metallurgical, and fracture characteristics of hybrid-reinforced magnesium metal matrix composite synthesized via friction stir processing route

Influence of Fly Ash and Emery based particulate reinforced AA7075 surface composite processed through friction stir processing

Optimization and effect of B4C/Al2O3 with graphite particulates on tribological properties of Al7075 surface hybrid nanocomposite

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Optimization and effect of B₄C/Al₂O₃ with graphite particulates on tribological properties of Al7075 surface hybrid nanocomposite