Advanced Materials and Processes Research Institute
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Sliding Wear Response of a Bronze Bushing: Influence of Applied Load and Test Environment.
No full textThe Stretch, Limit and Path Forward for Particle Reinforced Metal Matrix Composites of 7075 Al Alloys
No full textAluminium alloy-based metal matrix composites (AMMCs) have been by now established themselves as a suitable wear resistant material especially for sliding wear applications. However, in actual practice engineering components usually encounter combination of wear types. An attempt has been made in the present paper to highlight the effect of dispersing SiC in 2014 base alloy adopting the liquid metallurgy route on different wear modes like sliding, abrasion, erosion, and combinations of wear modes like cavitation erosion, erosion abrasion, sliding abrasion, and the results obtained compared with the base alloy. It is found that there are a number of contributing factors for the resulting wear and all are not necessarily derogatory in nature. The limits within which the AMMCs can exhibit superior performance over the base alloy have been discussed. Worn surface and subsurface studies have been carried out to understand the mechanism of material removal and the role of the different contributing factors to material removal. Wear mechanisms that have been prevalent have been suggested and the possibility of making wear resistant components from the MMCs is discussed based on the experimental results obtained
Effects of T6 heat treatment on mechanical, abrasive and erosive-corrosive wear properties of eutectic Al–Si alloy
No full textThe abrasive and erosive-corrosive properties of eutectic Al–Si (LM6) alloy were studied. Microstructural features of the alloy were altered by controlling the T6 heat treatment parameter, and their influence on hardness, strength and elongation, and response of the samples in erosion-corrosion and abrasion conditions were studied. Characteristics of the Al–Si alloy samples were compared with those of Al conventionally used in agricultural machineries. Fabrication of a typical component using the Al–Si alloy was also explored in order to understand the feasibility of using the alloy system for the envisaged applications. The study suggests the response of the samples in different conditions to be greatly influenced by parameters like chemical composition, microstructural features and applied load, traversal distance and test environment. The performance of even the as cast Al–Si alloy is far superior to that of the conventional Al samples, while the T6 heat treated Al–Si alloy shows improved performance. Accordingly, the as-cast as well as T6 heat treated Al–Si alloy has potential for applications in agriculture as a replacement for the conventionally used Al
Sliding Wear Behaviour of Al-7075 based Metal Matrix Composite: Effect of Processing Parameters
No full textMetal Matrix Composite made from Al-7075 based alloy dispersed with 10% SiC particles through the liquid metallurgy route were evaluated for their sliding wear properties under different loads and for a length of sliding distance. The volume loss and wear rate under different\ud
experimental conditions were compared between the following conditions for both the alloy and composite (i) cast (ii) aged (iii) extruded. Attempts have been made to arrest wear of the alloys that experience seizure under the mildest of experimental conditions through the above processing\ud
techniques and explain the experimental results through worn surface studies. The extent of success attained through each process has been discussed. It is felt that the cumulative effect of the different processing techniques including composite making, ageing and extrusion can open up new avenues\ud
for this alloy system, which in general is not used for wear resistant application
Combined effects of composite making, ageing and\ud extrusion on property improvements in Al-7075-based\ud alloy
No full textThe present paper reports attempts made at enhancing the\ud
mechanical and wear resistance properties of a commonly used aluminium alloy, the 7075 alloy by different routes. They include:\ud
1 making composites\ud
2 ageing of the alloy and composite\ud
3 extruding the alloy and composite to rods.\ud
A comparison in the properties including microstructure, hardness, mechanical and sliding wear resistant properties attained by the different routes have been attempted. It has been found that making composites drastically increases the\ud
hardness of the alloy and extruding them further increases the value marginally. Homogenisation increases the UTS for both the alloy and composite; however, extrusion does not show any positive effect especially for the composite. The\ud
presence of dispersoid particles changes the ductile behaviour of the alloy to a brittle failure for composites. This type of an analysis and study would help find the extent to which the properties in this alloy system can be improved and the additive enhancement if any vis-à-vis only ageing, extrusion or composite making
Effects of Some Solid Lubricant Particles and Their Concentration in Oil towards Controlling the Wear Performance of a Leaded-Tin Bronze Bush.
No full textPhoto degradation of synthetic dyes using cadmium sulfide nanoparticles synthesized in the presence of different capping agents
No full textPhoto-degradation of synthetic dyes by cadmium sulfide nano-particles synthesized by micro-emulsion/arrested precipitation routes using thioglycolic acid; potassium pyrosulfate and disodium salt of ethylene diamine tetra acetic acid (EDTA) as capping agents have been investigated. Synthesized nanoparticles have been characterized by X-ray diffraction, thermo-gravimetric analysis, high-resolution transmission electron microscopy, BET surface area analysis and UV–Vis spectro-photometry. The synthesized cadmium sulfide nano particles are observed to be a mixture of cubic and hexagonal phases and have crystallite size and surface area of 3.7, 6.8 and 13.9 nm and 32.11, 29.54 and 8.63 m2/g for thioglycolic acid, potassium pyrosulfate and EDTA capping agents, respectively. As expected, the photo-catalytic efficiency of nano-particles for degradation of dyes is observed to increase with increase in surface area (decrease in particulate size)
