• D B Goel

      Articles written in Bulletin of Materials Science

    • Electron microscopic studies of thermomechanically aged 2218 aluminium alloy

      Mukesh Kumar S Singh D B Goel

      More Details Abstract Fulltext PDF

      The effect of thermomechanical ageing (TMA) treatment on the microstructure and mechanical properties of 2218 Al alloy has been studied. This was followed by hardness measurements and transmission electron metallography (TEM). The 2218 Al alloy was given various thermomechanical ageing treatments including partial peak ageing, warm rolling and further ageing to peak hardness level. Without thermomechanical treatment the peak hardness value was 130 VHN. With thermomechanical treatment there was an overall improvement in hardness. This is attributed to the combined effect of dislocation precipitate networks and the fineness ofθ′ particles.

    • Thermomechanical ageing (TMA) of 2014 aluminium alloy for aerospace applications

      S Singh D B Goel

      More Details Abstract Fulltext PDF

      Various thermomechanical ageing (TMA) treatments for 2014 Al-alloy have been developed which include partial peak ageing, warm rolling and further ageing to peak hardness at 160°C. Electron microscopic studies reveal that the TMA treatments affect substantially the ageing characteristics. The TMA-Ib treatment yields finestϑ′ needles having longitudinal dimensions of ∼400 Å. TMA treatment leads to precipitate-dislocation network of different magnitudes. Among the TMA treatments, the TMA IIb treatment results in thickest precipitate-dislocation tangles. In addition toϑ′, two types of dispersoids Al4CuMg5Si4 and Al12 (Fe, Mn)3Si have been observed. The density or concentration of these dispersoids is drastically reduced due to TMA treatments. Thus an optimum TMA treatment i.e. TMA-IIb has been developed which results in a significant improvement in the mechanical properties of 2014 Al-alloy.

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