Rahul Mitra | Indian institute of technology (original) (raw)

Rahul Mitra

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Papers by Rahul Mitra

Transactions of the Indian Institute of Metals

Solid State Phenomena, 2008

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Materials Science and Engineering: A, 2014

Oxidation behavior of hot pressed (HP) and arc melted (AMI) Mo76Si14B10 alloy has been studied at... more Oxidation behavior of hot pressed (HP) and arc melted (AMI) Mo76Si14B10 alloy has been studied at 1150 °C in different partial pressures of oxygen to explore the mechanism of protection against degradation. Microstructure of both the differently prepared alloy consists of Moss, Mo3Si and Mo5SiB2 phases with varying morphologies. The size of Moss phase is 3 times bigger in AMI alloy compared to that in the HP alloy. Cyclic oxidation of the HP alloy shows 1.5 and 4 times lower mass loss compared to that of the AMI alloy during exposure in air ( = 0.21 atm.) and oxygen ( = 1 atm.), respectively due to microstructural refinement in the latter alloy. The top surfaces of the oxide scales that forms over both the differently prepared alloys after six cycles of oxidation in air are found to be smooth and shows the viscous flow of borosilicate glass, whereas, round pores have been observed in case of both HP and AMI alloys oxidized in oxygen. A dark grey uppermost borosilicate layer followed...

Transactions of the Indian Institute of Metals, 2009

In situ Al-4.5Cu-5TiB2 composite has been processed through stir casting method, in which, the Ti... more In situ Al-4.5Cu-5TiB2 composite has been processed through stir casting method, in which, the TiB2 particles have been precipitated in situ by mixed salt route involving reactions between K2TiF6 and KBF4.The as-cast specimens containing 20 volume percent liquid content have been subjected to three mushy state roll passes, each leading to 5 percent reduction in thickness. The grain structure has

MRS Proceedings, 1991

ABSTRACT The metal-ceramic interface in an XDTM Al/TiCp metal matrix composite has been character... more ABSTRACT The metal-ceramic interface in an XDTM Al/TiCp metal matrix composite has been characterized in as-extruded, recrystallized, and high temperature heat-treated conditions. In both the as-extruded and recrystallized composite, the interface is atomically abrupt. Localized orientation relationships exist between Al and Tic that lead to some degree of coherency at the interface. Recrystallization produces semicoherent interfaces by formation of subgrains in the Al adjacent to the Tie particles. Few interfaces show cracking, even after extensive deformation. Lack of cracking together with the direct contact down to atomic level, observed between the two phases are evidence for excellent bonding between the carbide particles and the aluminum matrix. Heat treating samples at 913 k for 24 hours produces reaction products like Al3Ti and Al4C3. These reactions are explained on the basis of thermodynamic data.