Advanced Materials and Processes Research Institute
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Structure-Property Related Changes in a Hypoeutectic Aluminium-Silicon Alloy Induced by Solutionizing
No full textAnnual Progress Report of Regional Research Laboratory, Bhopal for the year 1992-1993
No full textAnnual Progress Report of Regional Research Laboratory, Bhopal for the year 1992-199
Structure-Property Relations in a Hypereutectic Aluminium-Silicon Alloy Dispersed with Graphite Particles
No full textThree-Body Abrasive Wear Behaviour of 0.98% C Steel
No full textLow stress abrasion studies of a hypereutectoid steel have been carried out using a rubber wheel abrasion test\ud
apparatus. Hardness of the steel was changed by subjecting the specimens to different heat treatment cycles.\ud
Abrasion tests were conducted at various loads and wheel speeds using crushed silica sand as the abrasive medium. Wear rates of the steel in all test conditions decreased significantly during the running-in period prior to attaining steady state values, which was considered to be due to the abrasion-induced work hardening of the regions close to the abraded surface. Results showed that the increase in bulk hardness of the steel specimen caused a linear increase in wear resistance. Furthermore, up to a bulk hardness of about 400 HV, the rate of increase was higher than that above 400 HV. Increase in the applied load caused lower wear resistance, while speed did not show any definite trend. One of the material removal mechanisms, in particular, was found to be microcutting as indicated by continuous grooves on the wear surface and generation of machining chips in the debris. Micropitting was found to be\ud
another wear mechanism as evidenced by the formation of craters on the wear surface and flake-shaped particles\ud
in the wear debris.\u
Characterization and microstructural modifications of pressure die casteutecfic aluminium-silicon alloy graphite composite.
No full textTHIS PAPER CONCERNED MMC IN SOME IMPORTANT WAY AND CONTAINED INFORMATION ABOUT, UTILIZED, OR DISCUSSED THESE SUBJECTS: BASIC TOPICS:, DATA, DR MMC, MMC, MMC DATA MATERIALS AND MATERIAL TYPES:, (GR)P/AL, (GR)P/AL-SI, AL MATRIX, AL-SI MATRIX, GR/AL, GR/ AL-SI, LM13 MATRIX, PARTICULATES MATERIAL CHARACTERISTICS AND DATA FIELDS:, DENDRITIC ARM SPACING DATA, DENSITY, DENSITY DATA, ELECTRICAL RESISTIVITY, ELECTRICAL RESISTIVITY DATA, HARDNESS, HARDNESS DATA, INTERFACIAL BONDINGS, MODIFICATIONS, MORPHOLOGY, POROSITY, WEAR RESISTANCES, WETTABILITY, TESTING AND TEST CONDITIONS:, SEM MANUFACTURING:, AGING, PRESSURE DIE CASTINGS, SOLIDIFICATIONS MISCELLANEOUS AND SPECIAL TECHNICAL TERMS:, DENDRITIC ARM SPACING, ELECTRICAL APPLICATIONS, HEAT TREATMENTS, MICROSTRUCTURES
“Fluoride Aided Leaching of Glauconitic Sandstone for a Fluid Fertilizer”, Minerals Engineering.
No full textQuantitative extraction of potassium from glauconitic sandstone with dilute sulphuric acid, in the presence of fluoride ion has been rationalized on the basis of the synergistic effect exerted by both the cations and anions of the added fluoride salts. It has been shown that the reaction kinetics follow the well defined Crank-Ginstling Brounshtein diffusion equation throughout the process
Extraction of potassium from Glauconitic Sandstone by the Roast-Leach Route.
No full textLaboratory studies have been conducted on the roast-leach method as a possible route of extraction of potassium from glauconitic sandstone. Roasting kinetics with calcium chloride has been investigated. The effect of roasting time, temperature, particle size and ratio of glauconitic sandstone/calcium chloride on roasting of potassium have been investigated. After roasting potassium has been recovered in the from of potassium chloride by leaching with distilled water. The dissolution rate at different temperatures has also been studied. The roasting reaction has been found to follow the well defined Ginstling-Brounshtein diffusion equatio\ud
The diffusion through the product layer has been found to be the rate controlling step. The activation energy for roasting has been found to be 103.3 kJ/mole
Corrosion behaviour of sintered 6061 aluminium alloy-grahite particle composites.
No full textThe corrosion behaviour of sintered 6061 aluminium alloy and its composite dispersed with 7.0 vol% graphite particles is described. Techniques, namely immersion, tafel and impedance, were employed to study the corrosion behaviour. Immersion tests were performed in different media, namely HCl, NaCl and lubricating oil (used and fresh) while tafel and impedance tests were performed in 0.1 N HCl and 3% NaCl solution. Corrosion behaviour was monitored by measuring the weight change in immersion studies and corrosion current, icorr, in tafel and impedance tests. The values of corrosion potential, E corr, and i corr were calculated from the tafel plots obtained at a scanning rate of 1 mV s−1. In impedance study, i corr was calculated from the value of polarization resistance, R p, obtained from the Nyquist plot; the latter was obtained by merging the lock-in and FFT plots. Aluminium alloy and its composite suffered from corrosion in HCl and NaCl. However, the extent of severity was greater in the case of HCl. The i corr values obtained by the impedance method also revealed a similar trend. The higher corrosion rate of the alloy and composites in HCl was due to the dissolution of the thin oxide (protective) film in the solution. The decreased corrosion rate of the composite and the base alloy in NaCl was attributed to the formation of stable corrosion product, Al (OH)3, on the surface, which prevented further attack on the surface of the specimen. There was practically no evidence of corrosion attack on the alloy and the composite surface in used and fresh lubricating oil
Erosion-Corrosion Characteristics of an Aluminium Alloy - Alumina Fibre Composite
No full textThe present paper describes the erosion-corrosion behaviour of an aluminium alloy (BS: LM 5) and its composite containing 10 vol.% alumina fibres. Tests were performed in 3% NaCl solution with and without sand particles (10 wt.%) using the rotating sample method. Salt immersion and potentiodynamic polarization studies of the specimens were also carried out in 3% NaCl solution. Both the tests showed increased weight loss with test duration. The composite suffered from more material loss than the base alloy. The erosion-corrosion test revealed a significantly higher extent of weight loss in the specimens as compared to the immersion test in an identical electrolyte (3% NaCl). Corrosion of the samples proceeded by the breaking-off of the oxide layer followed by nucleation of micropits and crater formation. Further, the composite suffered from additional attack by the electrolyte at the dispersoid-matrix interfaces. The potentiodynamic study indicated only a nominal shift in the corrosion potential of the composite, while a considerable increase in the corrosion current density of the base alloy was observed due to the incorporation of A120, fibres. The presence of the alumina fibres in the matrix alloy increased the susceptibility of the composite towards pitting (at the fibre-matrix interface). In erosion-corrosion tests, weight loss of the samples was accelerated by the ~pingement of the electrolyte at corroded sites leading to easy removal of corrosion products from the surface. The presence of sand particles in the electrolyte further accelerated the process of material removal due to rapid formation of pits and craters and (partial) removal of alumina fibres from the surface. Four stages of erosion-corrosion, namely (1) incubation period, (2) accelerated erosion-corrosion, (3) deceleration period and (4) steady state material loss, were observed during the erosion-corrosion tests