Advanced Materials and Processes Research Institute
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Mechanisms of Material Removal and Subsurface Work Hardening During Low-Stress Abrasion of a Squeeze Cast Aluminium Alloy-Alumina Fibre Composite
No full textLow –stress abrasive wear behaviour of squeeze-cast aluminium and its composite containing 10 vol% of al2o3 fibres has been examined in this study using an ASTM standard rubber wheel abrasion test apparatus Slica sand particles(size 212-300) were used as the abrasive. \ud
A progressive decrease in wear rate with increasing number of test intervals. Until a steady state value was reached, was noticed for the base alloy as well as the composite . Abrasion-induced subsurface work hardening was found to be responsible for the progressive reduction in the wear rate of the base alloy. Factors causing identical behaviour of the composite were noted to be the protrusion of the reinforcement i.e. Al2O3 fibred on the abraded surface offering protection to the softer matrix, as well as the abrasion-induced subsurface matrix hardening, Scanning electron microscope examination of the abraded and transverse sections suggested the matrial removal mechanism of the composite to consist of preferential removal of the matrix in the beginning , leading to the protrusion of the dispersoid phase ( the latter offered protection to the matrix) and finally the subsequent fracture and partial removal of the dispersoid from the surface\u
Characterization of and Structure-Property Relations in a Pressure Die Cast Hypoeutectic Aluminium-Silicon Alloy Dispersed with Graphite Particles.
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Sintering Behaviour of Pyroprylite Mineral: Effect of some Alkali and Alkali and Alkaline Extre Metal Carbonates.\ud
No full textPyrophyllite mineral was heat treated with alkali and alkaline-earth metal carbonates in equimolar ratios at 1000 °C for 2 h and the various phases formed in the sintered products were investigated using X-ray powder diffraction and infrared spectroscopy. The morphology of the products was studied using scanning electron microscopy. In each case formation of aluminosilicate phase of respective cation was observed, but the presence of mullite in sintered products was not detected
Sintering behaviour of pyrophyllite mineral: effect of some alkali and alkaline-earth metal carbonates
No full textPyrophyllite mineral was heat treated with alkali and alkaline-earth metal carbonates in equimolar ratios at 1000 °C for 2 h and the various phases formed in the sintered products were investigated using X-ray powder diffraction and infrared spectroscopy. The morphology of the products was studied using scanning electron microscopy. In each case formation of aluminosilicate phase of respective cation was observed, but the presence of mullite in sintered products was not detecte
Dry Sliding Wear Behaviour of Squeeze Cast Aluminium Alloy-Silicon Carbide Composites
No full textSqueeze cast Al alloy (BBS: LMI 1) matrix composites,, each containing 10 vol.% of Sic particles or fibres, have been investigated for their resistance to dry wear under varying applied pressures (1-3 MPa) at a sliding speed of 2.68 m s-1 against a rotating EN25 steel disc. Seizure pressure of the composites as well as the base alloy was determined using a pin-on-disc machine. The alloy containing SiC particles showed less wear rate than the one having SiC fibre dispersion. The base alloy showed maximum rate of wear. Dispersoid-matrix interfacial bonding and shape of the dispersoid were found to play an important role in governing the wear rate of the composites.\ud
Scanning electron microscopy examinations indicated relatively finer grooves on the wear surfaces prior to seizure, while seizure led to severely damaged surfaces. Similarly, wear debris generated during wear was thin and flaky prior to seizure, while bulky debris particles were observed during seizure. A few iron machining chips were also found in all the cases. The results obtained have been explained on the basis of wear-induced microstructure changes and deformation, leading to work hardening in the subsurface regions and wear debris.\u
