Advanced Materials and Processes Research Institute
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Aluminium Alloy-BasedMetalMatrix Composites: A PotentialMaterial forWear Resistant Applications\ud
No full textTitanium foam through powder metallurgy route using acicular urea particles as space holder.
No full textIn the present work, Ti foam has been synthesized employing powder metallurgy route. Irregular titanium powder particles were used as the matrix and acicular urea particles as the space holder. The distribution of the urea particles in the matrix of the compacted mass was observed to be fairly uniform. Pore morphology and compressive behavior of the resulting foam have been studied. The processed foam consisted of acicular porous regions of size up to 500 μm. The porous regions contained a large number of micro-pores along with the occasional presence of coarse pores, the latter thought to be unhealed portions of the original acicular pores. The foam delineated a distinct plateau region with plateau stress of 275 MPa and energy absorption\ud
capacity of 55 MJ/m3.\u
Determination of aliphatic amines by gas chromatography-mass spectrometry after in-syringe derivatization with pentafluorobenzoyl chloride
No full textA simple and highly sensitive gas chromatographic method has been developed for the determination of low molecular weight short-chain aliphatic amines (SCAAs) after their simultaneous extraction and in-syringe derivatization with pentafluorobenzoyl chloride (PFBOC). Derivatization of the low molecular weight aliphatic amines in bicarbonate buffer of pH 10.5 with PFBOC was followed by immersed solvent microextraction. Derivatization conditions, including reagent concentration, reaction pH, ionic concentration of buffer, reaction time, stirring rate, reaction temperature and extraction solvent, have been investigated for method optimization. Linearity was studied within range of 0.15pgml(-1)-50ngml(-1). The correlation coefficients were between 0.9934 and 0.9999. Detection limit of derivatized amines proved to be in the range of 0.117-1.527pgml(-1), and the intraday and interday relative standard deviation (RSD) values were less than 8% with respect to peak area. The method was applied for analysis of lake, river and industrial waste water. The recoveries of extraction from lake, river and industrial waste water samples, which have been spiked with different levels of aliphatic amines, were in the range of 68-99%, 63-102% and 62-105%, respectively
Microstructure and Micromechanism Maps to Optimize Useful Deformation Processing Conditions in Magnesium Alloy.
No full textSliding Wear Response of a Gray Cast Iron: Effects of Some Experimental Parameters.
No full textThis investigation pertains to the influence of some test parameters like applied load, sliding speed and test environment on the sliding wear behaviour of a grey cast iron. Properties studied were wear rate, frictional heating and friction coefficient in dry and oil lubricated conditions. The wear response of the samples has been discussed in terms of specific characteristics like load bearing, lubricating and cracking tendency of different micro constituents of the cast iron. Examination of wear surfaces, subsurface regions and debris particles has also been carried out to understand the operating wear mechanisms and further substantiate the observed response of the samples.\ud
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Sliding Wear Behaviour of Cast Iron: Influence of MoS2 and Graphite Addition to the Oil Lubricant.
No full textSliding Wear Behaviour of Zinc-Based Alloy vis-à-vis Gray Cast Iron as Influenced by Applied Load and Sliding Speed
No full textPurpose – The objectives of this paper are to assess the sliding wear response of a zinc-based alloy over a range of sliding speeds and pressures in oil-lubricated condition with respect to a cast iron, to understand the role of different microconstituents in controlling the observed wear behaviour and to examine various operating material removal mechanisms. Design/methodology/approach – Sliding wear tests have been carried out using a pin-on-disc machine in oil-lubricated condition at different speeds and pressures. The wear response has been explained in terms of specific nature of various microconstituents of the specimen materials and\ud
substantiated through the characteristics of wear surfaces, subsurface regions and debris particles. Findings – The wear rate increased with the sliding speed while load produced a mixed influence. Further, the friction coefficient and frictional heating were influenced by the test duration, load and speed in a mixed manner. Moreover, the zinc-based alloy attained lower wear rate but higher friction\ud
coefficient than that of the cast iron while frictional heating followed a mixed trend. Practical implications – The paper further establishes a zinc-based alloy as a potential substitute material system to a well-known cast iron in\ud
tribological applications and enables further understanding of the wear mechanisms. Originality/value – The present paper assesses the sliding wear performance of a lighter zinc-based alloy as an effective potential substitute material system to cast iron in tribological applications. An attempt has also been made to understand the role played by different microconstituents in controlling the wear behavior and substantiate the wear response through the characteristics of wear surfaces, subsurface regions and debris.\u
Compressive Deformation Behaviour of Al Alloy (2014)-10wt.% SiCp Composite: Effects of Strain Rate and Temperature.
No full textThis paper deals with the compressive deformation behaviour of AA2014–10 wt.% SiCp composites synthesized by stir casting technique. The response of the composites was studied over the strain rates of 0.01–10/s and the temperature range of 200–500 ◦C. The flow stress increased with increasing strain rates while increasing temperature produced a reserve effect. The flow behaviour of the samples has been represented by Zener–Holloman parameter Z that was affected by strain rate and temperature in a manner\ud
similar to that of the flow stress. The lowering of Z value with increasing temperature is essentially due to extensive dynamic softening. The stress exponent (n) and deformation activation energy (Q) have been evaluated by linear regression analysis. The activation energy for the hot deformation of the composite was found to be 168 kJ/mol, which is higher than bulk self diffusion of pure Al i.e., 142 kJ/mol. The higher activation energy required for the flow of composite was mainly due to the alloying elements present in the Al matrix and dispersion of SiC particles that restricted the flow of material.\u
Manganese recovery from secondary resources: a green for carbothermal reduction and leaching of manganese bearing hazardous waste
No full textDuring the hydrometallurgical extraction of zinc by electrowinning process, a hazardous solid waste called anode mud is generated. It contains large quantity of manganese oxides (55-8%) and lead dioxide (6-16%). Due to the presence of a large quantity of lead, the anode mud waste is considered hazardous and has to be disposed of in secure landfills, which is costly, wastes available manganese and valuable land resources. For recovery of manganese content of anode mud, a process comprising of carbothermal treatment using low density oil (LDO) followed by sulphuric acid leaching is developed
