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Introduction To Electrodynamics

Recent advancement in the natural fiber polymer composites: A comprehensive review

A heat treatable TiB2/Al-3.5Cu-1.5Mg-1Si composite was successfully fabricated by selective laser melting (SLM). The results show that the Q phase forms in the matrix of the as-fabricated TiB2/Al-3.5Cu-1.5Mg-1Si composite. After T6 heat treatment, the Q phase disappears and the AlxMny, Mg2Si and Al2Cu(Mg) phases are formed. The same results can be observed before and after heat treatment in the unreinforced Al-Cu-Mg-Si alloy. EBSD and TEM analyses indicate that the addition of the TiB2 particles results in a remarkable grain refinement, leading to enhanced strength of the TiB2/Al-Cu-Mg-Si composite in comparison to the unreinforced Al-Cu-Mg-Si alloy in both the as-fabricated and heat-treated conditions. Both grain refinement and Orowan strengthening contribute to the high strength of the heat treated TiB2/Al-Cu-Mg-Si composite.

A heat treatable TiB2/Al-3.5Cu-1.5Mg-1Si composite fabricated by selective laser melting: Microstructure, heat treatment and mechanical properties

Metal matrix composites (MMCs), as advanced substitutes of monolithic metallic materials, are currently getting an increasing trend of research focus as well as industrial applications for demanding applications such as aerospace, nuclear and automotive because of their enhanced mechanical properties and relative lightweight. Nevertheless, machining of MMC materials remains a challenging task as a result of their structural heterogeneity which leads to deterioration of the machined surface integrity and rapid tool wear. While most of the research was focused on testing and analytical/numerical investigations of the tool wear, limited work was focused on machined surface integrity of MMCs. This paper presents a detailed literature survey on the conventional and non-conventional machining of metal matrix composites with the primary focus on the aspects related to workpiece surface integrity. The contribution of material mechanical and microstructural properties as well as the material removal mechanism upon the quality of workpiece surfaces/subsurface are discussed along with their influences on the fatigue performance of machined part.

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State-of-the-art of surface integrity in machining of metal matrix composites

Aluminum metal matrix composites (AMMCs) used in different industries from automotive to aerospace for specific purposes. Many problems hinder the full-scale industrialization of AMMCs but the main problems include wettability, particle distribution, porosity, and chemical reaction. These problems have explicit effects on mechanical, wear, and corrosion resistance properties of the composite materials. Therefore, it is essential to cope up with these problems for better quality of AMMCs. This paper focuses on issues related to AMMCs fabrication, corrosion resistance, wear resistance, machining parameter optimization, and chip analysis of AMMCs. Literature provides a guideline to researchers about present scenario of AMMC fabrication using stir casting process. Moreover, paper presents properties and applications of AMMCs.

Processing issues, machining, and applications of aluminum metal matrix composites

Intrinsically smart, metal matrix composites (MMCs) are lightweight and high-performance materials having ever expanding industrial applications. The structural and the functional properties of these materials can be altered as per the industrial demands. The process technologies indulged in fabrication and machining of these materials attract the researchers and industrial community. Hybrid electric discharge machining is a promising and the most reliable nonconventional machining process for MMCs. It exhibits higher competence for machining complex shapes with greater accuracy. This paper presents an up-to-date review of progress and benefits of different routes for fabrication and machining of composites. It reports certain practical analysis and research findings including various issues on fabrication and machining of MMCs. It is concluded that polycrystalline tools and diamond-coated tools are best suitable for various conventional machining operations. High speed, small depth of cut and low feed ra...

Fabrication and Machining of Metal Matrix Composites: A Review

The Electrical Discharge Machining (EDM) technique was performed under the magnetic field influence to determine the material removal mechanism as well as surface roughness (SR) of nonmagnetic mate...

Investigation of magnetic field-assisted EDM of composites

The present study deals with the optimization of parameters to check the effectiveness of thermoelectric machining of aluminum based SiC reinforced composites. Here, hybrid ED machining of Al-SiC metal matrix composites (MMCs) is investigated in magnetic field incorporated conventional Electrical Discharge Machining (EDM). The input processing parameters, such as pulse-on/off duration, current were assessed to analyze their outcome on the response parameters in terms of material erosion rate (MER), microhardness (MH), surface roughness (SR) and recast layer formation. The experimental results witnessed decrease in microhardness values and reduced thickness of recast layer, accompanied by a significant effect on MER and surface finish while machining in the magnetic field coupled higher spark energy. The experimental results conferred the process stability and an excellent correspondence with experimental verifications.

Magnetic Field Influence on Surface Modifications in Powder Mixed EDM

The present study deals with an investigation of the hybrid electric discharge (ED) machining process executed in a magnetic field for improving process performance. Previous magnetic field-assisted electric discharge machining (MFAEDM) techniques, however, are limited to use with a class of magnetic workpieces. In this particular study, the magnetic field was coupled with the conventional EDM plasma zone to test the hybrid process on Al-based metal matrix composites (MMCs). The machining parameters, for instance, peak current as well as duration of pulse-on were selected to nail down thereafter effects on the response parameters like the material removal rate (MRR) and the surface integrity. The experimental results show an improvement of 12.9% MRR and reduction in recast layer formation at higher spark energy in the magnetic field environment. As the experimental outcome implied that the MFAEDM imparted appreciable process stability, a highly efficient pertinent process of EDM with high quality of the m...

Study of Magnetic Field-Assisted ED Machining of Metal Matrix Composites

The current research study for hybrid machining of Al-based metal matrix composites (MMCs) employs magnetic field coupled traditional electrical discharge machining (EDM) to address the manufacturing demands in aeronautics, automobile, medical equipment, etc. The input processing parameters, for instance, magnetic field intensity, pulse-on/off duration, peak current, variant of electrodes as well as workpiece were evaluated to determine their after-effects on the responses in terms of microhardness (MH) and recast layer formation while machining of Al-SiC composites. The experimental results show 22% decrease in the surface microhardness values and thinner recast layer formation at magnetic field coupled higher spark energy. The results demonstrate the process stability and exhibit a good accord with experimental verification.

H. S. Payal

Papers

Fabrication and Machining of Metal Matrix Composites: A Review

Investigation of magnetic field-assisted EDM of composites

Magnetic Field Influence on Surface Modifications in Powder Mixed EDM

Study of Magnetic Field-Assisted ED Machining of Metal Matrix Composites

Magnetic Field Assisted EDM: New Horizons for Improved Surface Properties