In the present investigation, Magnesium composites have been fabricated with boron carbide (B 4 C) as reinforcement by powder metallurgicaltechnique. Two different particle sizes-micro and nano B 4 C particles with weight percentage of 0%, 5% and 10% has been studied. The green compacts were prepared by cold pressing and then sintering the specimens before being subjected to cold upsetting under triaxial stress state condition in order to study the phenomenon of workability and instantaneous strain hardening index. Powder characterizations are discussed using x-ray Diffraction peaks, Scanning Electron Microscope images and Energy Dispersive Spectrum analysis. Cold upsetting has been preferred to investigate the performance of the composites. The values of formability stress index factor (β σ ), various stress ratio (σ θ /σ eff , σ m /σ eff andσ z /σ m ) parameters and instantaneous strain hardening index (n i ) are observed for increase in % of B 4 C particles and its sizes. The experimental results were analyzed pertaining to relative density. The results reveal that Mg-10% nano B 4 C composite has higher relative density, formability stress index factor and hence high workability than the other composites. The addition of B 4 C particles as reinforcement affects the strain hardening index due to geometric and work hardening of the composites. particles or whiskers with even small volume fractions greatlyimprove the strength and stiffness of the composites [10].Among various reinforcements used with magnesium, boron carbide (B 4 C) is the best because of its low density combined with high hardness, fracture toughness, superior elastic modulus and tremendous wear resistance [11,12]. Because of its better properties, it has extensive applications in nuclear, automobile and aerospace sectors and high skilled applications such as light weight shields, fast-breeders, abrasivegrit, and nozzles, cutting and grinding tools and so on [13][14][15].The popularity of magnesium matrix composites in day-to-day life is delayed because of the cost, which mainly involves the cost of reinforcement particles and the method of fabrication [16]. Hence the potential of magnesium matrix composites with wide variety of reinforcing materials in advanced functional and structural materials needs attention in processing techniques and their features in order to select the suitablefabricationtechnique for that particular composite material. To fabricate magnesium matrix composites, three well-known processing techniques namely Powder Metallurgy (P/M), squeeze casting and stir casting are available [17]. The P/M technique is attractive among others because particlesreinforcedwere evenly distributedin the matrix thereby regulating the microstructure and improving the structural and mechanical properties [18].Al-SiC composites subjected to mechanical, machinability and metallurgical studies reveals that reducing the size of the particle reinforcement increases the life in low cycle fatigue because of cyclic hardening [19]. Relative density of...
Silicon carbide reinforced aluminium have been developed since past 3 decades for many structural and automotive applications especially for manufacturing gears due to their excellent characteristics such as light weight, high strength, good wear resistance and other mechanical properties. Gears are transmission components that requires high wear resistance as well as self-lubrication properties while performing the needed operations. The present research elucidates the addition of particle reinforcement with Al6061 with particle size 50 µm and different weight percentages of Silicon carbide (SiCp) such as 3, 6 and 9 for gear blank application. The addition of SiCp with Al6061 enhance its properties and provides prolonged use of gear for many applications. In this study, the gear blank has been produced via traditional powder metallurgy method by adding Zinc stearate as binding agent. The compacted green part was further processed with sintering process with 500°C in muffle furnace. The sintered gear blank was examined for mechanical properties such as hardness and surface roughness according to ASTM standards. The influence of SiCp with Al6061 were evaluated by incrementing the SiCp. It was seen that there was an increase in the hardness showing the dispersion of hard particles SiCp throughout the structure. Further, the surface roughness varied depending on the process and heat treatment of compacted composites. This study gives better understanding about the effect SiCp reinforcement on mechanical properties of Al6061 metal matrix.
Titanium alloys are extremely difficult to machining and economically it’s very expensive, so that to minimize the machining cost using the novel bondless diamond grinding wheel, analyze the performance of nanometric finishing in grinding operation. While machining the Ti alloys, the cutting zone temperature is too high, so that to reduce the temperature of cutting zone and favorable change in the chip-grinding using liquid nitrogen (LN2) coolant for good surface finish.
In today’s aviation world, the design of aircraft wing becomes a challenging one for aeronautical engineers, in order to meet the aero elastic phenomenon such as flutter, wing divergence in both aerodynamics and structural aspects. There are so many FEM packages available for both flow and structural analysis such as ANSYS, NASTRAN, ALGOR, NISA, ADINA, COSMOS, etc. The paper presents the application of computational aero-elasticity (CA) methods to analyze the wing in both aerodynamic and structural aspects, using ANSYS-FLOTRAN; 2-D typical aerofoil sections were analyzed and validated with experimental results. Also the vibration behavior of wing section is analyzed under MODAL, HARMONIC, TRANSIENT and SPECTRUM analysis under the aerodynamic lift force and moments. The support reaction forces and moments at the fuselage-wing intersection are developed in this research.
Detonation gun spray coating method (D-Spray) [1] is one of the effective method of thermal spray coating process. The surface of material or substrate will be enhanced by deposition of coating powders such as metal oxides and ceramics like aluminium oxides, tungsten carbide ,nickel chromium etc by D-spray method that prevents the metal from corrosion and to increase the wear resistance. This coating process had wide applications in different engineering sectors such as aviation industry, marine industry, biomedical industry etc., In this Experimental study the Process parameter optimization of D-spray coating process which is one of the Thermal spray Coating process was done by Taguchi method, [3] in order to find the best processing conditions and to get higher quality of coating. [6] Microhardness was estimated for various combinations of parameters and the optimum process parameters were obtained. Best combination of process parameters has been predicted which results that the thickness of the coating has got a major effect.
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