Aluminum powder size and microstructure effects on properties of boron nitride reinforced aluminum matrix composites fabricated by semi-solid powder metallurgy (original) (raw)
Related papers
Mechanical characterization of aluminum reinforced with boron carbide metal matrix composites
1ST INTERNATIONAL CONFERENCE ON MANUFACTURING, MATERIAL SCIENCE AND ENGINEERING (ICMMSE-2019), 2019
Advanced engineering materials with high end mechanical, electrical and magnetic properties are required for Material technology and Engineering design field. Mostly Ceramic particles like Al2O3, BORON are reinforced with Aluminum metal matrix for their rectified mechanical properties like hardness, toughness, and low wear rate to befit engineering industries requirements. Boron carbide reinforced Al metal matrix composites has inviting properties like good tensile strength, high hardness and low density on comparing with Al-BORON composites have been shown by recent researches. This paper deals with developing lightweight Aluminum-Boron carbide composites and also evaluate the mechanical properties with consequences of calcium carbide particles addition. To fabricate & testing mechanical properties of Aluminum metal matrix composites with Boron Carbide and Calcium Carbide reinforcements at various volume proportions is the goal of this paper. By integrating boron carbide and calcium carbide particles, Mechanical properties like tensile strength, impact strength and hardness of newly developed metal matrix composites rectified indicatively.
Production and characterization of Al-BN composite materials using by powder metallurgy
2018
Aluminum matrix composites containing 3, 6, 9, 12 and15% BN has been fabricated by conventional microwave sintering at 550 and BN powders is observed after sintering under Ar shroud. XRD, SEM (Scanning Electron Microscope), mechanical testing and measurements were employed to characterize the properties of Al + BN composite. Experimental results suggest that the best properties as hardness 42, 62 HV were obtained for Al+12% BN composite.
Mechanical Properties of a Novel Aluminum Matrix Composite Containing Boron
Journal of the Mechanical Behavior of Materials, 2001
A new alloy series manufactured from commercial aluminum boron alloys has been investigated as insitu aluminum matrix composites. Aluminum diboride particles acting as ceramic reinforcements of the mostly pure aluminum matrix greatly increase cold work hardening of the composite. After alloying aluminum boron composites with copper in less than 5 weight percent, the matrix of the composite becomes hardenable by heat treatment. Microhardness analyses conducted during heat treatment indicates that precipitation hardening is enhanced with respect to regular aluminum copper alloys.
An attempt is made to synthesize the nano h-BN powders by high energy ball milling and also aluminium reinforced h-BN composite by powder processing route. The impact of ball milling time on microstructure and particle size reduction of h-BN powder was investigated by FESEM, FTIR, XRD, UV-vis diffuse reflectance spectroscopy and particle size analyser.It was indicated that high energy ball milling is effective up to 10 hours in reducing the particles size a further increase in time is resulting in agglomeration. Microhardness of the composite increases in proportion to increases in weight percentage of reinforcement, h-BN exhibited a poor sinterability without any accelerating agentand with tin addition up to 0.5% low melting point metal.TGA and DTA study shows that there is reduction in melting point from 641ºC to 638 ºC with addition of 2% weight fraction of h-BN.
Fabrication and mechanical properties of aluminium-boron carbide composites
With the increasing demand of lightweight materials in the emerging industrial applications, fabrication of aluminium-boron carbide composites is required. In this context aluminium alloy-boron carbide composites were fabricated by liquid metallurgy techniques with different particulate weight fraction (2.5, 5 and 7.5%). Phase identification was carried out on boron carbide by X-ray diffraction studies. Microstructure analysis was done with scanning electron microscope. Scanning electron microscopy images shows that boron carbide particles are uniformly distributed in aluminium matrix. The composites were characterized by hardness and compression tests. With the increase the amount of the boron carbide, the density of the composites decreased whereas the hardness is increased. The ultimate compressive strength of the composites was increased with increase in the weight percentage of the boron carbide in the composites.
Experimental Investigation on Mechanical Properties of Aluminium - Boron carbide Composites
International Journal of Scientific Research in Science, Engineering and Technology, 2023
In this investigation, metal-matrix composites of Aluminium matrix reinforced with boron carbide (B4C) particles were fabricated by stir casting technique. Aluminium is selected as the matrix material and boron carbide as reinforced particles are mixed in different weight percentages (0, 2.5, 5 and 7.5 wt %). The test samples were prepared as per ASTM standards to investigate mechanical properties. The experimental result reveals that the tensile strength and hardness increases with the increase in B4C percentage, whereas percentage elongation decreases with the increase in B4C percentage.
Microstructure and Mechanical Properties of Al2024-B4C-hBN Reinforced Metal Matrix Composites
2018
In the present work, Al2024 MMC is processed using boron carbide [B4C] and h-BN particulates as reinforcement by stir casting method. B4C is used because of its high stiffness and hardness and h-BN is used because smooth machining properties and act as solid lubricants. Stir casting technique is gaining importance due to its easy setup, low cost, uniform dispersion of reinforcement compare to other technique. MMC is obtained by incorporation of reinforcements by keeping B4C 6% constant and h-BN varied as 3%, 6%, 9% to investigate mechanical properties. Microstructural study shows that the B4C particulates in the molten matrix forms strong matrix reinforcement interface. The mechanical properties like tensile test and hardness test are investigated for Al2024-B4C and h-BN reinforcedMMC. From optical metallurgical microscopic analysis uniform distribution of B4C and h-BN particles along the aluminium matrix is observed. The hardness of Aluminium matrix increased with addition of 3%, 6...
Gas atomized Al (6061) powder particles were used to synthesize nano-structured Al based composite powders reinforced with 2 and 5wt.% of nano and micro sized boron carbide particles by mechanical alloying. These composite powders as well as the un-reinforced Al powders were compacted by cold uniaxial pressing. In order to investigate the effect of consolidation procedures on the properties of the resultant Al-BC composites, a number of the samples were subjected to sintering at 620 °C for 2h while the others were hot extruded at 520 °C with t he extrusion ratio of 8:1. The effect of percentage and size of B4C on the density, hardness and mechanical properties (such as yield strength, compression strength) of the composites were evaluated and compared with those of the un-reinforced alloy. The fractured surfaces of the samples were studied by scanning electron microscopy (SEM). The results of the present study revealed a higher hardness for the extruded samples as compared with their sintered counterparts attributable to their increased density and decreased matrix grain size. It was also shown that addition of 2 and 5wt.% of B C nano-particles increased yield strength of the extruded samples by 3 and 4 times respectively as compared with the un-reinforced aluminum.
Boron Carbide (B4C) Reinforced Aluminum Matrix Composites (AMCs)
International Journal of Innovative Technology and Exploring Engineering, 2019
Aluminum matrix composites (AMCs) demonstrating a good combination of properties that are hard to acquire by a monolithic aluminum material. Since the last few decades, investigators have shown their keen interest to advance these materials for complex applications. Homogeneous reinforcement distribution, defect-free microstructure, and improved resultant properties depends on the fabrication method along with matrix and reinforcement materials and size. Two-step melt stirring technique and K2TiF6 flux enhanced the wettability and improve the particle distribution of boron carbide (B4C) in AMCs. The mechanical properties of the AMCs were enriched by either extrusion process or thermal treatment. Hybrid composites exhibited better characteristics than mono composites. Surface composites manufactured by incorporation of reinforcement in the surface layer; offer good surface properties without losing toughness and ductility. The B4C-Al interfacial reactions produce different precipitat...
Currently aluminum metal matrix composites (MMC) with particulate reinforcement and related manufacturing methods are among important research topics because of their low density, high specific stiffness, strength, and wear resistance. B 4 C p /Al composites are commonly used materials for fabrication of lightweight functional components. Different percentage amounts of B 4 C p (3wt%, 6wt%, and 9wt%) were added to the aluminum matrix and the composite materials were prepared at 823 °K under argon atmosphere. The X-ray diffraction (XRD) showed the formation of the phases such as Al, B 4 C and AlB 2 in B 4 C p /Al composites. The density of the composite materials decreased from 2.5773 to 2.5270 g/cm 3 with an increase in the amount of B 4 C p addition. The optimum properties (hardness and compressive strength) were obtained by reinforcement with smallest B 4 C particles (size 22 µm). The present work was concentrated on the feasibility of the fabrication of B 4 C p particulate reinforced aluminum MMCs by P/M technique.