Abstract
The present research work involves the study of AA 7075-TiB2-Gr in situ composite through stir casting route. This in situ method involves formation of reinforcements within the matrix by the chemical reaction of two or more compounds which also produces some changes in the matrix material within the vicinity. Titanium Diboride (TiB2) and graphite were the reinforcement in a matrix of AA 7075 alloy. The composite was prepared with the formation of the reinforcement inside the molten matrix by adding salts of Potassium Tetrafluoroborate (KBF4) and Potassium Hexafluorotitanate (K2TiF6). The samples were taken under casted condition and the properties of the composite were tested by conducting characterization using X-ray diffraction (XRD), hardness test, flexural strength by using three-point bend test, scanning electron microscope (SEM), optical microstructure, grain size analysis, and surface roughness. It was found that good/excellent mechanical properties were obtained in AA 7075-TiB2-Gr reinforced in situ hybrid composite compared to alloy due to particulate strengthening of ceramic particles of TiB2in the matrix. Further, Al 7075-3% TiB2-1% Gr hybrid in situ composite exhibited improved machinability over the alloy and composites due to self-lubricating property given by the Gr particles in the materials.
Highlights
Composite material is composed of two or more materials at a microscopic scale and has chemically distinct phases
The composite was prepared with the formation of the reinforcement inside the molten matrix of Titanium Diboride (TiB2) which was obtained by adding salts of Potassium Tetrafluoroborate (KBF4) and Potassium Hexafluorotitanate (K2TiF6) [11]
The following conclusions can be drawn as the result of the experimental study of AA 7075/x% TiB2/1% Gr and AA
Summary
Composite material is composed of two or more materials at a microscopic scale and has chemically distinct phases. In metal matrix composites (MMCs) high strength and fracture toughness and stiffness are offered by metal matrices compared to those offered by their polymer counterparts [1,2,3,4,5]. High elastic modulus, and increased wear resistance over conventional base alloys, AA 7075 alloy was selected because of its low specific weight and high strength-to-weight ratio and its excellent machinability, formability, and weldability [8]. This alloy is widely used in automotive industry, aircraft industry, and defense industries [9, 10]. TiB2 is well known as a ceramic material with relatively high strength and durability as characterized by the relatively high values of its melting point, hardness, strengthto-density ratio, and wear resistance [9]
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