Role of Third Material (Interlayer) on Mechanical Properties of the AA2024-Copper Joints Carried out by Friction Stir Welding (FSW)

The work focused on improving the mechanical properties of AA2024-Cu joints by introducing a third material in the form of interlayer. The interlayer chosen for this purpose was Zn based on the resultant intermetallic phases that could have formed with matrix. Experiment was carried between AA2024 and copper plates with Zn strip. It included the optimization of tool-offset positions. The welds were characterized by scanning electron microscope (SEM) equipped with electron probe micro-analyser (EPMA) and X-ray diffraction (XRD) techniques. The results showed that the Zn strip diffused well into the AA2024 matrix at the optimum tool-offset position and it had formed more than two intermetallic phases in the processed region, which had improved the strength and ductility of the welds significantly. It concluded that it was possible to enhance the properties by altering the composition and kind of intermetallics by using an appropriate filler metal in the form of interlayer

HPTLC Analysis of Tephorisa pulicherrima (Baker) Gamble Ethanol Extract of Root

Tephrosia pulcherrima commonly known as “Kalakkozhuppa,” is well known for its therapeutic properties in the Indian traditional medicinal system. The presence of important bioactive compounds in plants makes them pharmacologically valuable. Therefore, in this study, the High-Performance Thin Layer Chromatography (HPTLC) analysis of Tephrosia pulcherrima (root) ethanol extract was performed for its phytochemical profiling. The HPTLC densitometric analysis of the ethanol extract of Tephrosia pulcherrima was carried out using CAMAG HPTLC system, and the results were obtained in the form of chromatograms (scanned at the wavelength of 254 nm and 366 nm) representing several peaks. The phytochemical profile of the plant was determined and presented in the tables showing the total number of peaks, peak heights, peak area, percent area, and Rf values. The study concluded that T. pulcherrima ethanol extract of the root contains a rich variety of phytochemicals which might be accountable for its therapeutic value and thus justifies its traditional use in India