[Retracted] Evaluation of Microstructure, Hardness, and Tensile Properties: A Comparative Study of Stir Cast and Extruded Al7005/Glass‐/Fly‐Ash‐Reinforced Hybrid MMCs

Swamy, Praveen Kumar; Mylaraiah, Shantharaja; Basheer, Dadapeer

doi:10.1155/2021/8601484

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…The ASTM E384 standard was used to measure the hardness of AA6026 and SiC reinforced AA6026 composite samples [21][22][23][24][25]. The coupons were polished using coarse emery sheets and the final polishing completed using very fine alumina particulates.…”

Section: Hardness Testmentioning

confidence: 99%

Characterization and optimization of abrasive water jet machining parameters of aluminium/silicon carbide composites

Gowthama,

Somasheker,

Suresha

et al. 2023

Mater. Res. Express

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Due to the complexity of high temperature and cutting tool wear, most machined components are still facing problems in terms of harder functional fillers that reinforce aluminium matrix composites. Conversely, abrasive water jet machining (AWJM) incredibly useful for the cutting of anisotropic and non-homogeneous metal matrix composites. In this research article, silicon carbide (SiC) particulates were utilized as reinforcement in the AA6026 matrix material (AA6026/SiC) and machined using AWJM under different process parameters namely SiC loading, traverse speed and stand-off distance. Two different compositions of SiC (4, and 8 wt%) were considered to fabricate AA6026 composites using the stir casting. In addition, outputs have been examined, e.g., surface roughness, material removal rate, and kerf angle. An optical microscope, scanning electron microscope, Brinell hardness tester and universal testing machine have been used to characterize the matrix material AA6026 and its composites. Microstructural analysis revealed that the inclusion of SiC particulates in AA6026 affects the very fine grain size of the composite. Furthermore, the 8 wt% composite exhibits the evolution of the Al-Si eutectic phase during solidification. Processing of these composites was performed using the L27 orthogonal geometry, successfully improving the parameters of the abrasive water jet process. The output response shows that reducing the SiC load improves the surface roughness under the key parameters of traverse speed and stand-off distance. However, increasing the SiC loading increases the material removal rate and kerf angle under the key parameters, namely traverse speed, and stand-off distance.

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Section: Hardness Testmentioning

confidence: 99%

Characterization and optimization of abrasive water jet machining parameters of aluminium/silicon carbide composites

Gowthama,

Somasheker,

Suresha

et al. 2023

Mater. Res. Express

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“…This type of disc braking system has been widely adopted for use in high-speed trains due to its highly effective braking and heat dissipation properties, and aluminium-based hybrid composites with various reinforcements have attracted wide attention because of their multi-functional properties. These composites have not only good mechanical properties, but also improved wear resistance and thermal properties [7][8][9]. During braking, the kinetic energy and potential energies of a moving vehicle are converted into thermal energy through frictional heat between the brake discs and the pads.…”

Section: Introductionmentioning

confidence: 99%

On the Impact of Surface Morphology and Transfer Film on Brake System Performance of High-Capacity Metro Train

et al. 2022

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The brake system of Melbourne’s High-Capacity Metro Train (HCMT) suffers from consistently extended braking distances after repeating a set of high-speed tests and the commission process. The degradation of brake system performance affects the safety of rolling stock and its conformance to the design standard. In this paper, the root cause leading to the degraded brake performance was analyzed. The brake discs and brake pads of the affected train and another train with normal working conditions were removed and a series of examinations was to determine the reason for the change of friction coefficient between friction surfaces. The results revealed that brake disc samples from the affected TS02 trainset suffered from changed transfer film and surface morphology after multiple consecutive high-speed braking applications. The factors that may affect the brake system performance were analyzed in the laboratory. It was found the brake disc surface had a lower hardness level, coefficient of friction, and smaller contacting area with the brake pad when compared to the brake disc and pad samples from another trainset. These factors harmed the performance of the braking system, and the decrease in the braking effort led to a longer braking distance than expected and failed braking tests.

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“…Tis article has been retracted by Hindawi, as publisher, following an investigation undertaken by the publisher [1]. Tis investigation has uncovered evidence of systematic manipulation of the publication and peer-review process.…”

mentioning

confidence: 99%