Advanced Materials and Processes Research Institute
Advanced Materials and Processes Research Institute, BhopalNot a member yet
809 research outputs found
Sort by
A problem of thermal stresses half spaced containing a penny shaped crack at the interface.
No full text
Tribological Behaviour of Aluminium Alloy Composites: A Comparative Study With a Copper Base Alloy
No full textThis paper describes the results of dry sliding wear tests of LM13 alloy and graphite particle-reinforced LM13 alloy composite in cast and hear=treated conditions, and their comparision with a conventionally used copperbased bearing alloy. Sliding wear tests were conducted on a pin-on-disc wear test apparatus against a rotating steel(EN25) counterface at a sliding velocity of 2.68 m s-1 . Results of the present investigation showed that the wear rate of the composite was considerably less than that of the copper-based alloy at an applied pressure of less than 4.0 MPa. Above 4.0 MPa the composite samples seized. However, the seizure pressure of the composite was less than that of the copper-based alloy. Detailed studies of wear surfaces, wear debris and subsurface deformation have been carried out. The overall results indicate that the hear-treated aluminium alloy-graphite composite could be considered as an excellent substiture for a conventional bearing alloy, such as Su-Sn-Pb, at relatively low applied pressures (below 4.0 MPa), while the copper-based alloy can withstand higher pressures (up to 10 MPa)
Corrosion behaviour of sintered 6061 aluminium alloy-graphite 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
Debye Charactristic Tempeature for Rapidly Solidified Al-Mn Alloys with a Software Package.
No full textThe work described in this article was undertaken in an attempt to explain the high-temperature stability of rapidly solidified, face-center ed-cubic Al-8Mn-2Ni alloys by the change in Debye characteristic temperature (Θ). The Θ has been determined from the x-ray diffraction intensities by evaluating Debye Waller factor B. It was found that Θ remains almost unchanged on annealing up to 623 K, thus predicting its high-temperature stability
Characterization and Microstructural Modifications of Pressure Die Cast Eutectic Aluminium-Silicon Alloy-Graphite Composite
No full textAbrasion-Induced Microstructural Changes and Material Removal Mechanisms in Squeeze Cast Aluminium Alloy-Silicon Carbide Composites
No full textApplication of Mozley Mineral Separator for the Treatment of Coal Washery Rejects.
No full textIn some coal washery operations there is considerable loss of coal value due to inefficient operation of the fine coal treatment circuit. Recent developments in the use of various gravity equipments in fine-coal beneficiation have been discussed and their relative merits have been compared. The possibility of using a Mozley mineral separator for processing of flotation tailings and recovery of clean coal has been examined on the basis of the investigations carried out.\ud
Laboratory scale experiments are reported using a fine coal sample from waste tailings of a coal preparation plant. The results of optimisation of process variables and co-relation developed between the operating variables of the equipment and the yield and ash content of the product have been presented. The possible application areas are discussed including fine coal beneficiation and refuse treatment
