A5069588918- Thermodynamic and Structural Properties of Metals and Alloys
- Metallurgical and Alloy Processes
- Chemical Thermodynamics and Molecular Structure
- nanoparticles nucleation surface interactions
- Material Properties and Applications
- Solidification and crystal growth phenomena
- Aluminum Alloy Microstructure Properties
- Intermetallics and Advanced Alloy Properties
- Advanced Materials Characterization Techniques
- Material Science and Thermodynamics
- Material Dynamics and Properties
- Molten salt chemistry and electrochemical processes
- Thermodynamic properties of mixtures
- Material Properties and Failure Mechanisms
- Quasicrystal Structures and Properties
- Fusion materials and technologies
- Nuclear Materials and Properties
- Metallurgical Processes and Thermodynamics
Tribhuvan University
2018-2025
Lawrence Livermore National Laboratory
2025
Biratnagar Eye Hospital
2020-2024
In the framework of Redlich–Kister (R–K) polynomials, both linear and exponential temperature-dependent energy interaction parameters for constituent binary subsystems liquid Al–Ga–Mg alloys were optimised. These then used to estimate excess Gibbs free mixing, enthalpy mixing activity ternary system at 923 K, 973 1023 1073 K 1123 employing General Solution Model (GSM), Toop Kohler models. The surface tensions systems calculated using Butler's equations. viscosity was Kaptay's equations with...
This study demonstrates the 100 g scale manufacture of a plutonium alloy that ages at an accelerated rate. The resulting six times faster than typical weapons-grade due to addition 238Pu. As major innovation, process involved using partial direct oxide reduction technique. method was achieved by developing new, complex geometry stirrer additive manufacturing reduce 238Pu and efficiently incorporate it into metal. material then purified molten salt extraction electrorefining before being...
The thermodynamic and surface properties of the ternary Al–Cu–Fe alloy in liquid state have been computed using different models. properties, such as activity excess free energy mixing tension calculated. temperature dependence concentration components fixed proportion any two also with respect to change range 1823–2073 K has studied.
The compositional dependence of thermo-physical properties Si-Ti liquid alloy has been reassessed using different modeling equations at temperatures 2000 K, 2400 K and 2473 K. thermodynamic structural the system have computed in frame work quasi-lattice test. extent surface segregation tension mixture Butler’s afore mentioned temperatures. results so obtained compared with available literature database. Theoretical investigations shows that compound forming tendency gradually decreases...
Thermo-physical properties of Al-Mg alloys in molten state at 1073 K have been studied using thermodynamic modeling. Thermodynamic properties, such as free energy mixing, heat entropy activities and structural concentration fluctuation long wavelength limit, Warren-Cowely short range order parameter K, 1173 1273 1373 on the basis regular associated solution model. The surface concentrations tension liquid by Butler’s A consistent set model parameters also obtained optimization procedure...
Thermodynamic and surface properties of Ti-Al-Fe liquid ternary alloy have been assessed at temperatures 1873 K, 1973 2073 K 2173 K. The thermodynamic properties, such as activity studied using general solution model (GSM) excess free energy mixing has GSM, Kohler Toop models. In concentration computed Butler's equation tension the all four above mentioned models feeding database Ti-Al, Al-Fe Ti-Fe sub-binary systems. values GSM are in well agreement with each other concentrations. Moreover,...
Thermodynamic and surface properties of the ternary system were studied at different higher temperatures (1973 K, 2073 2173 K 2273 K). The thermodynamic using Chou, Kohler Toop models. Meanwhile, investigated same models plus Butler model. alloys computed from compared with one another. concentration components Ti–Al–Si alloy was Butler's equation.
The thermodynamic and structural properties of liquid Al-Au alloy have been studied in frame-work R-K polynomial using temperature-dependent energy interaction parameters at different temperatures. Thermodynamic properties, excess free mixing activity, concentration fluctuation long wave-length limit computed temperatures 1338 K, 1500 K 1600 K. such as surface tension the system above mentioned Butler model. shows transformation from segregating to ordering nature with increase Au.
Thermodynamic, structural, surface and transport properties of Au-Cu liquid alloy were calculated on the basis different theoretical modeling equations. The thermodynamic properties, such as excess Gibbs free energy mixing, enthapy mixing activity estimated compared with available experimental literature data simple theory (STM). best fit values model parameters using enthalpy system at 1550 K. Using same frame, concentration fluctuation in long wave-length limit Warren-Cowley short range...
Thermodynamic functions like excess Gibbs free energy of mixing (∆GxsM) and activity (a) liquid Al-Sr alloy were studied in the temperature range 1323-1623 K frame work Redlich-Kister (R-K) polynomial. The compositional dependence structural concentration fluctuation long wavelength limit (Scc(0)), Warren-Cowley short order parameter (α) ratio mutual to intrinsic diffusion coefficients (Dm/Did) computed analysed using same approach. surface tension (σ) segregation (xsi) tendencies atoms...
Quasi-lattice model has been employed to study the thermodynamic and microscopic structural properties of Cu–Zr liquid alloy in temperature range 1400-1700 K. The fit parameters required for purpose have optimised using available literature data at melting system, 1400 These then computed different temperatures assuming them be linear temperature-dependent. surface system But- ler above mentioned temperatures.
A theoretical analysis of the thermodynamic, structural, and surface properties liquid Fe–Si alloys has been conducted at various elevated temperatures using R–K polynomials. The thermodynamic parameters, including free energy mixing, heat entropy activity components in alloys, were found to be excellent agreement with relevant experimental values. structural behavior indicates that alloy an ordering nature. Strongly ordered produce more stable homogeneous joints, which is desirable welding....
The excess free energies of sub-binary Al–Sn, Sn–Zn and Zn–Al alloys ternary Al–Sn–Zn alloy were computed using the optimised exponential parameters R–K polynomial at 973, 1073, 1173 1273 K. values energy mixing, enthalpy mixing activity compared with available experimental data. surface concentrations monomers Butler model. tension liquid was calculated in framework Chou, Kohler, Toop Bulter models for tension. viscosity systems have been Kaptay equation help results Kohler model parameter...
Thermo-physical properties of ternary Al-Fe-Mn alloys were studied using various theoretical models. The excess free energy mixing binary sub-systems the alloy was computed an exponentially optimised interaction parameter in framework R-K polynomial. different surface and calculated Butler equation. values tensions so obtained then used to calculate sub-systems. parameters for tension modelling equations. viscosities Kaptay, Kozlov-Romanov-Petrov Moelwyn-Hughes models viscosity Chou, Toop,...
Using experimental and literature data, the linear temperature-dependent interaction parameters of Redlich-Kister (R-K) polynomial for binary subsystems Al-Cu-Ni liquid alloy were optimized. The activities sub-systems' monomers then computed using optimised validated against available data. thermodynamic database excess Gibbs free energy mixing was theoretically reproduced ternary system at temperatures 1773 K, 1873 1973 2073 K based on General Solution Model (GSM), Toop model Kohler model....
The Redlich-Kister (R-K) polynomial has been generally used to model the mixing properties of binary and higher order alloys. interaction energy parameters R-K are assumed be either linear or exponentially temperature-dependent. When these temperature-dependent, computed thermodynamic functions sometimes show unusual trends. But when they exponential such trends do not appear in theoretical calculations. Therefore, Cu-Mg liquid alloy have studied using temperature-dependent above-mentioned...