• D Banerjee

      Articles written in Sadhana

    • Challenges in alloy design: Titanium for the aerospace industry

      D Banerjee R V Krishnan

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      This review describes the principles governing the design of titanium alloys for engine and airframe applications in the aeronautical industry. The relationships between processing, microstructure and properties of the commonly used α + β titanium alloys are described in some detail. The ‘state of science’ is seen to be sufficiently advanced to enable the metallurgist to optimally design this class of alloys to meet specific requirements. The challenges to the alloy designer lie in increasing the temperature capability of titanium alloys, and in standardising processing techniques which will decrease the high manufacturing costs of components.

    • Toughening and creep in multiphase intermetallics through microstructural control

      A K Gogia R G Baligidad D Banerjee

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      The lack of engineering ductility in intermetallics has limited their structural applications, in spite of their attractive specific properties at high temperatures. Over the last decade, research in intermetallics has been stimulated by the discovery of remarkable ductilisation mechanisms in these materials. It has however often been the case that the process of ductilisation or toughening has also led to a decrease in high temperature properties, especially creep. In this paper we describe approaches to the ductilisation of two different classes of intermetallic alloys through alloying to introduce beneficial, second phase effects. The Ti2AlNb based intermetallics in the Ti-Al-Nb system can be ductilised by stabilising thebcc phase of titanium into the structure. The principles of microstructural and compositional optimization developed to achieve adequate plasticity, while retaining creep properties of these alloys, are described. An entirely different approach has been successful in imparting plasticity to intermetallics based on Fe3Al. The addition of carbon to form the Fe3AlC0.5 phase imparts ductility, while enhancing both tensile and creep strength.

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