Advanced Materials and Processes Research Institute
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809 research outputs found
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Transformation characteristics of supersaturated aluminium-chromium solid-solution.
No full textA supersaturated solid solution containing 1.6 W/o chromium was formed by cooling AI-2W/o Cr alloy at rates greater than 1250°C/s from the liquid state. On annealing, the alloy preferred to transform to the stable CrAI7 phase without revealing the predominance of vacancy solute clusters as evidenced in Al-Mn system. The activation energy for the growth of CrAl7 was found to be between 0.40 to 0.50 ev and the degree of supersaturation was found to vary exponentially with the, cooling rate
Thermomechanical processing of Al based particulate composites.
No full textThermomechanical processing of aluminium-based particulate composites containing dispersions of various soft and hard particles such as graphite, zircon, glass, alumina and mica in aluminium alloy matrices, with a view to improving strength and ductility for structural applications, has been discussed. The existing literature on the subject has been critically reviewed and analysed, and broad guidelines for optimum thermomechanical processing have been presented. Considerable improvements in strength and ductility of these composite materials have been reported after rolling, forging and extrusion due to fragmentation/fibrization of particles together with the refinement of matrix microstructure, annihilation of defects such as porosity, and texture hardening, etc. The influence of process variables, and of volume fraction, size and morphology of the particles on the strengthening mechanisms, fracture toughness and work-hardening behaviour of worked composites has been discussed
Tensile and impact behaviour of chopped sunhemp-polyester composites
No full textComposites of chopped sunhemp fibres with polyester resin have been examined; ultimate tensile strength (UTS) and impact strength have been determined. UTS of sunhemp-polyester composites increases with increase in volume fraction of sunhemp fibre. This increase in UTS has been explained on the basis of adhesion between fibre and matrix. Impact strength of the composites increases with increase in volume fraction of fibre because the fibres help in arresting and diverting cracks.\u
The Effect of Thermal Cycling on the Kinetics of Cellular Precipitation in a Cu-In Alloy
No full textSeparation of ceramic particles from aluminium metal-ceramic composites.
No full textAn improved method for separation and quantitative analysis of ceramic particles in aluminiumceramic mixture and cast materials is given. The mixture containing H2SO4, HNO3 and HCI has been found to be most efficient in the separation process. Mixtures containing other acids have been shown to be unsuitable. Optical and scanning electron micrographs of acid-treated aluminium-graphite and talc samples are presented
SEM studies on silica from plain materials, X-ray spectometro.
No full textThe Silica structural framework in plant materials can be separated from the organic part by acid leaching and can be examined by SEM. Scanning electron micrographs characterizing the bonding and distribution patterns of silica in rice husk, rice straw and sugarcane leaves are presented. The differences in the surface morphology of the three plant products are discussed
