Innovated the most sensitive method of measuring a gas (222Rn) permeation and developed its most advanced version at IIT-Kharagpur (sponsored by the Department of Atomic Energy) for measuring flux down to 2300 atoms m-2.s-1 through any given material continuously for months. The method has revealed for the first time several novel facets of the inert-gas permeation in metals and alloys, using 222Rn as a probe.
Introduced a new computer simulation method called ‘Iso-Concentration Contour Migration (ICCM) method’ for predicting the diffusional transformation kinetics in the year 1979.
Introduced a modified version of the ICCM method in 1998 to reveal for the first time that the mechanical alloying kinetics in miscible systems is related to the melting temperature of the system. Contemporary ballistic diffusion theory failed to show such a correlation, that is useful for prediction of the time required for alloying.
First to report the occurrence of allotropic transformations in Nb-Al and Ni-Si solid solutions induced by mechanical alloying and presented comprehensive analysis to identify the origin of such transformations.
Conclusively demonstrated in 1989 through a novel experimental method (using coated microcrystal), that soft mode is not always relevant to martensite nucleation
Modified the well-known Cahn’s equation for predicting the solute supersaturation behind a migrating reaction front in solids
Proposed a mass balance integral method for calculating the moving boundary diffusional transformation kinetics.
Proposed new versatile models for the kinetics of peritectic and peritectoid transformation.
A breakthrough in consolidating bulk tungsten components at a temperature (1790° C) much lower than that for conventional sintering at ≥ 2700 C.
Developed a new W-based ‘alloy’ i.e. W0.5Cr0.5–3 wt.% Y2O3 in 2015, which showed excellent sinterability at 1790°C and extreme oxidation resistance during prolong exposure (e.g. 100 h) at 1200 °C .
Through an industrial experiment in 2015 established the optimum oxygen injection level for deriving benefits like reduced coal consumption and doubling the campaign life of sponge iron rotary kiln.
Formulated a new versatile molecular dynamics-stochastic model for nanofluids which has explained several characteristics features of heat conduction by the nanofluids.