Additive manufacture of adaptive materials for communications applications Professor Patrick Grant For any antenna system there is a trade-off between antenna bandwidth wide as possiblesize small as possible and efficiency high as possible. However, using only the current and long-standing, narrow and passive palette of materials suitable for antennas means that this trade-off is unhelpfully constrained, preventing more radical and advantageous designs such as low profile, low detectability, low power and miniaturized platforms. This project will undertake high risk, novel research in making novel tunable materials for communication applications using our in-house state-of-the-art additive manufacture equipment. The focus is primarily on materials science and engineering by integrating design, materials and new manufacturing approaches to demonstrate practical ideas for improved antennas.
The microstructure and chemical composition of composites were investigated by means of SEM and energy dispersive spectrum EDS analysis and the mechanical properties was also measured.
The quasicrystal was not decomposed. Mechanical properties of the as-castand alloy were improved obviously. SiC particles were dispersed uniformly in Al matrix, and SiCp segregation was not found in composites.
PAN-carbon fibers were pretreated using three methods. The results indicate that the morphologies of the in situ particles are mainly with ball-shape, the sizes are in nanometer scale and the distributions in the matrix are uniform.
The interfaces between the in situ particles and the aluminum matrix are net and no interfacial outgrowth is observed. In-situ TiB2 particles reinforced AA composites were fabricated through mixed-salts route and their bending properties were studied.
The improvement in bending strength may be attributed to dislocation strengthening, Orowan strengthening, and grain strengthening. The good bonding between the reinforcements and the matrix also plays an important role.Electron beam welding, despite a long history and widespread arc and laser technology, is still widely used in industry.
The main applications for this high efficiency welding process are: automotive, electronics, electrical engineering, aerospace and mechanical engineering industry. The Al 4 C 3 phase (aluminium carbide needle phase) is known to have negative influence on the corrosion and mechanical properties of AMCs.
David et al. synthesized and characterized aluminium hybrid composites reinforced with SiC and FA via stir casting technique. Tensile strength and hardness of the composites were improved due to high dislocation resulting from thermal mismatch between the.
Al-B4C is a Useful Nanocomposite in Aerospace, Transportation, Automotive, Military, Wear, Structural ect..
Mechanical Alloying is the Best Process for Producing Al-B4C Nano-composites. Good Distribution of Reinforcement Particle is the Most Advantage of MA Process Increasing Milling Time would Decrease Grain Size of Composite and Reaching Nano.
0 Votos desfavoráveis, marcar como não útil. Kimmari_Kommel. Enviado por arundixitu. each other and the individual constituents retain those properties in the case of composites, whereas in alloys, Al High strength,corrosion resistance & good formability Automotive parts,aircrafts.
Al+B4C 3% Al+B4C 6% ELONGATION IN % Author: STAFF. ABSTRACT Corrosion morphology and electrochemical performance of five different cast Al alloys were investigated. A short-term electrochemical test according to the DNV-RP-B standard was used to investigate electrochemical performance of these alloys.