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3. Microstructure and Near-Surface Tribological Property Correlations in Al-Cu Alloy Reinforced with Al2O3 Nanoparticles.

Author

Chatterjee, Subhranshu, Sengupta, Barnali, and Mallick, Amitava Basu

Subjects
METALLIC composites, ALUMINUM oxide, MICROSTRUCTURE, NANOPARTICLES, DISLOCATION density, TRANSMISSION electron microscopy, MICROCRACKS
Abstract

Strength and wear properties of metal matrix composites are important because of their numerous applications in automotive and aerospace industries. In the present study, Al-Cu alloy-based nanocomposites reinforced with different volume percentages of Al2O3 particles were developed by reactive stir mixing of nanocrystalline CuO powder in molten Al. X-ray diffraction (XRD) patterns of the resulting nanocomposites revealed the presence of Al2O3 reinforcements and CuAl2 intermetallic particles. Microstructural characteristics of the samples were investigated and analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). TEM analysis revealed the presence of geometrically necessary dislocations and microcracks inside the sample. Average dislocation density was determined by the modified Warren–Averbach method from XRD patterns. The near-surface wear behavior of the composites was studied by nanoscratch tests. The results were correlated with the microstructural features and dislocation density. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Microstructure-Property Correlations of Multifunctional Si-Fe Nanocomposite

Author

Basu, Kausik, Chatterjee, Subhranshu, Roychowdhury, Anirban, Das, Dipankar, and Basumallick, Amitava

Abstract

Multifunctional Si-Fe nanocomposites with varying atom percent of Fe were prepared by the high energy ball milling technique. Presence of pristine Fe and Si as separate entities in the nanocomposites was confirmed through the analyses of their Mössbauer spectrum and, x-ray diffraction patterns. The average grain size of Si has been found to be 40nm and the superparamagnetic Fe particles in the nanocomposite systems has been found to increase with increase in milling time. Transmission electron microscopic images revealed discontinuous distribution of Fe in the Si matrix. The Si-Fe nanocomposites exhibit both magnetic and photoluminescence properties at room temperature. The photoluminescence intensity was found to decrease with increase in Fe content in the nanocomposite samples, however, saturation magnetization and retentivity increases. Thus it is imperative that by adjusting the composition of Si-Fe nanocomposites their properties can be tailored to suit the desired requirements for applications in electronic devices.

Published
2012
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