Title: Associate Professor First Name: Ramesh Chandra Last Name: Agarwala Sex: female Affiliation: Indian Institute of Technology Roorkee Adress: Roorkee-247667 India City: Roorkee Postal Code: 01332 Country: India Phone: 00919719475559 Email: ramesfmt@iitr.ernet.in Abstract: Development of Nanograined TiAl-graphite (Ni-P) by Mechanical Alloying Route Ramesh Chandra Agarwala*, Vijaya Agarwala* and Joanna Karwan Baczewska** *Metallurgical and Materials Engineering Department, IIT Roorkee, Roorkee-247667, India vijayfmt@iitr.ernet.in, ramesfmt@iitr.ernet.in,** AGH, Poland, Abstract Nano-materials are increasingly gaining importance in modern technological advances due to their unique properties as well as the efforts to miniaturized systems. In nanocrystalline materials majority of grain size is in range from 1~ 50 nm and offer a large surface that could be of a greater importance for tailoring various physical and mechanical properties. Mechanical alloying technique is one of the processes to produce advanced materials like intermetallics, amorphous alloys, rare earth alloys, nanocrystalline materials etc. through high energy milling which has an advantage of low temperature requirement for processing. TiAl has high temperature applications due to, high strength to weight ratio and high melting temperature, high stiffness and modulus of elasticity, good oxidation and corrosion resistance, positive dependence of strength on temperature (T< 873 K). However it encounters limitation like brittleness at room temperature and this effect may be reduced or eliminated if nanosized grains are produced. In the nano level, mechanical alloying is used for producing Ti-Al , Ti-Al-C, Ti-Al-Ni, Fe-Mo nano crystals and the small scale of microstructure causes enhanced diffusivity of species and solid-state phase transformation. In this work, an attempt has been made to produce intermetallic compound of TiAl based nanocomposite by using mechanical alloying method. Electroless Ni-P coated graphite powder is been mixed along with titanium and aluminium powders to study the effect of this inclusion. An attempt has been made to optimize the process parameters so as to achieve uniform structure in the nano range. The parameters studied are weight percentage of graphite (1 to 4 wt. %), time of milling and RPM up to 400 of the milling. The variation of b/h ratio obtained by XRD study with different milling conditions during mechanical alloying were analyzed to see the variation in the grain size. Oral?: on Poster?: Noprefer?: accompanying person :