Production of Aa7075/B4c Composite Materials by Semi-Solid Stirring Method

Abstract

AA7075 aluminum alloy was reinforced with B4C particles to produce aluminum composite materials. In the production of AA7075/B4C composite materials, the semi-solid mixing method was used for homogenous reinforcement dispersion and low-pressure solidification. For determination of the mechanical properties of the obtained samples, three-point bending, compression and hardness tests were performed. Additionally, the microstructure, reinforcement matrix interface and chemical structure of the produced composite material were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD) analyses. As a result, it was observed that, by using the semi-solid mixing method, the reinforcing powders could be distributed homogeneously into the matrix, both chemical and mechanical bonding could be facilitated between the matrix and the reinforcing material, and this mixing technique could be easily used in production of particle-reinforced metal composites. As the reinforcement rate increased, bending strength increased, but there was a reduction in comparison to the non-reinforced aluminum alloy. As the reinforcement rate increased, compressive strength was observed to decreased, while the mean hardness value increased.

THE EFFECTS OF WELDING PRESSURE AND REINFORCEMENT RATIO ON WELDING STRENGTH IN DIFFUSION-BONDED AlMg3/SiCp COMPOSITES

“…With semi-solid stirring, the reinforcement material can be homogenously stirred into the matrix alloy in the desired ratio, and during stirring, problems such as flocculation of the reinforcement, separation from the mixture or precipitation are not encountered. Additionally, as reinforcement addition takes place at a relatively lower temperature than liquid stirring methods, formation of unwanted reaction products is minimized [20,23,25].…”

“…Besides this, problems such as formation of unwanted reaction products due to processing temperatures higher than the melting temperature, uncontrolled solidifications that form during cooling or cracking of welding zones by excessive reduction of the ductility of the material are also frequently encountered [10][11][12][13][14]. In solid-state welding methods where melting does not take place, it is aimed for the materials to be bonded to preserve their structures and properties before the welding process, while the welding parameters in the diffusion bonding/welding method are temperature, pressure, duration of pressure application and atmosphere, welding zones with adequate mechanical properties may be obtained by providing the optimum values, and this method may also be used to bond MMCs according to the reports in the literature [15][16][17][18][19][20][21][22][23]. However, welding particle-reinforced aluminium composites is difficult and requires taking special precautions.…”

The Effects of Different Reinforcement Ratios on Wear Behaviors in EN AW 5754 (AlMg3)/SiCp Composite Materials Produced with the Squeeze Casting Method

“…For composite production, various metals such as aluminum, steel alloys, magnesium, brass, bronze and cast irons can be used as matrix or reinforcement materials [5][6]. Composite materials, which gain a high strength/weight ratio, high tensile and compressive strength, good corrosion resistance and wear resistance, as well as the ductility and toughness of metals and high strength and high modulus of elasticity of ceramics, by combining the desired properties of different materials on a macro level, are advanced materials whose area of usage has increased today in almost all industrial fields, especially defense, automotive and aviation [7][8][9][10][11][12][13].…”

Machine Learning Based Predictive Model for Surface Roughness in Cylindrical Grinding of Al Based Metal Matrix Composite

“…For this reason, traditional materials in the fields of the automotive, aerospace, defense, and military are progressively being replaced by MMC materials [1,2]. Amid all others, Aluminum (Al) based MMC materials, which are reinforced by silicon carbide particles (SiCp) have quickly become one of the most preferred MMC materials of recent date [3,4]. In the machining process of such exclusive materials, it is deserved a more and more advance engineering point of view to reveal perfect items to the end-users.…”