• D BANERJEE

      Articles written in Bulletin of Materials Science

    • Physical metallurgy of aluminum-lithium alloys

      G J Kulkarni D Banerjee T R Ramachandran

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      The addition of lithium to aluminium reduces the density and increases the elastic modulus; precipitation of the metastableδ′(Al3Li) phase from supersaturated Al-Li solid solution leads to appreciable increase in strength. The enhanced values for specific modulus and specific strength favour the use of the Al-Li alloys as structural materials for aerospace applications. However the binary alloys suffer from problems of poor ductility and toughness associated with strain localisation (resulting from the ease with whichδ′ particles are sheared during deformation), the presence ofδ′-free zones near grain boundaries and the heterogeneous nucleation of the equilibriumδ phase on the grain boundaries. These problems have been overcome by the development of ternary and quaternary alloys containing copper and magnesium. A small amount (∼0·1%) of zirconium is added to these alloys to improve the recrystallisation characteristics. The properties of alloys developed for commercial exploitation are briefly discussed. An overview of the physical metallurgy of the Al-Li alloys is presented with emphasis on the following features: (i) phase equilibria and precipitation reactions in Al-Li, Al-Cu-Mg, Al-Cu-Li and Al-Mg-Li systems and extension of these results to Al-Li-Cu-Mg alloys, (ii) insoluble particles and their effect on precipitation in the alloys, (iii) microstructural studies on Al-2·3%Li-1·2%Cu-0·7%Mg-0·12%Zr alloy, (iv) lithium depletion during solution treatment, (v) coarsening ofδ′ particles and development of precipitate-free zones near grain boundaries and (vi) microanalysis of the lithium containing phases.

    • Gold nanoparticle nanofibres as SERS substrate for detection of methylene blue and a chemical warfare simulant (methyl salicylate)

      M S S BHARATH CHANDU BYRA D BANERJEE D SARMA B BARKAKATY VENUGOPAL RAO SOMA

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      Flexible polymer (polyvinyl alcohol, PVA) nanofibres achieved with electrospinning and loaded with picosecond laser-ablated gold nanoparticles (Au NPs) were utilized as surface-enhanced Raman scattering (SERS) substrates.The fabricated polymer nanofibres and Au NPs were characterized by UV–Visible absorption, field emission scanning electron microscope, transmission electron microscopy and X-ray diffraction techniques. The PVA–Au NPs SERS substrates were used to detect the dye methylene blue (MB 5 $\mu$M) and a chemical warfare agent simulant (methyl salicylate) using a portable Raman spectrometer. The flexible PVA–Au NPs nanofibre exhibited a good sensitivity with enhancement factors of >10$^4$ and a high reproducibility (RSD$\sim$10%). These flexible substrates could be extended for SERS studies of various explosive and other hazardous molecules.

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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