A5074503264- Aluminum Alloy Microstructure Properties
- Solidification and crystal growth phenomena
- Metallurgical Processes and Thermodynamics
- Aluminum Alloys Composites Properties
- Metallurgy and Material Forming
- Additive Manufacturing Materials and Processes
- Additive Manufacturing and 3D Printing Technologies
- Magnesium Alloys: Properties and Applications
- Fire dynamics and safety research
- Flame retardant materials and properties
- Microstructure and mechanical properties
- Hydrogen Storage and Materials
- nanoparticles nucleation surface interactions
- Natural Fiber Reinforced Composites
- Textile materials and evaluations
- High Entropy Alloys Studies
- Mechanical Behavior of Composites
- Innovations in Concrete and Construction Materials
- Combustion and Detonation Processes
- Advanced Welding Techniques Analysis
- High Temperature Alloys and Creep
- Solar Thermal and Photovoltaic Systems
- Radioactive element chemistry and processing
- Powder Metallurgy Techniques and Materials
- Polymer composites and self-healing
Indira Gandhi Centre for Atomic Research
2024
Homi Bhabha National Institute
2024
The University of Queensland
2011-2021
Defence Bioengineering and Electromedical Laboratory
2005-2011
Indian Institute of Technology Kanpur
2010
University of Alberta
2004-2009
Institute of Minerals and Materials Technology
1999
Lalit Narayan Mithila University
1995
One of the less desirable aspects fusion-based additive manufacturing is propensity for coarse columnar grain structures crossing build layers to form. This paper initially attempts explain reason formation in terms high thermal gradients typically observed during solidification and alloy compositions that are used which promote epitaxial growth. Successful approaches refinement titanium alloys using alloying elements produce constitutional supercooling discussed along with difficulty...
Abstract The efficacy of Zr in removing Fe from molten Mg‐X binary alloys was studied experimentally and using calculated phase diagrams. is effective reducing the content Mg melt for alloys, X = Y, Si, Sn, Ca, Sr, Ce, Gd, Nd, Li, La, Mn, Zn. Purification occurs by precipitation rich precipitates, settling precipitates to bottom melt. Any desired down 1 ppm can be achieved appropriate treatment.
Abstract Flammability of Mg–X alloys was studied for X = Al, Ca, Si, Sn, Sr, La, Mn, Zn, Zr, Ce, Gd, and Nd. One end a horizontal cylindrical specimen subjected to free diffusion liquid petroleum gas (LPG) flame. There no burning without some melting the tip. Mg5%Gd, Mg3%Ca, Mg5%Ca had considerable resistance burning. Otherwise, on sufficient LPG flame exposure, there ignition tip; any hot detached blob continued burn until consumed, except Mg1%Ca, Mg3%La, Mg3%Ce, Mg5%Nd; tip extinguished...
It is well established that columnar grain structures usually form when metal alloys are used to additively manufacture components. A challenging goal produce an equiaxed structure throughout the component remove anisotropy and refine size in order improve its mechanical performance. The high cooling rates associated temperature gradients main reasons for formation of grains via epitaxial growth each added layer material. There appear be limited strategies promoting nucleation grains. In...
A microsegregation solidification model has been extended for an individual droplet falling through a stagnant gas during the atomization process. Assuming uniform temperature within droplet, takes into account nucleation undercooling and equiaxed growth of dendritic eutectic microstructures until complete solidification.1) It predicts evolution chemical segregation in terms percent microstructures. Extensive experiments have performed on Al–Cu droplets using impulse technique. The...
The burning behavior of commercial flame retardant (FR) polyester curtain fabric samples with varying weights in the range 300–550 g/m 2 is investigated using cone calorimetry. weight per unit area found to influence peak heat release rate, rate (RHR), smoke release, and other parameters. Oxygen consumption by needs be given due importance while selecting fabrics for application inside closed interiors.
Recently, in-situ observations were carried out by synchrotron X-ray radiography to observe the nucleation and growth in Al alloys during solidification. The grain formation of a range Al-Si Al-Cu binary studied. When refiner was added alloys, location events readily observed. Once began it continued occur wave with movement temperature gradient across field view due cooling. Other features observed settling primary phase grains floating effects convection marked fluctuation rate...
Recent work has extended the Interdependence Model to prediction of grain size aluminium alloys when refined by Al-Ti-B master alloys. The relative contribution Ti solute and TiB 2 particles as-cast was determined indicating optimum level addition required provide cost effective use alloy. This paper quantifies effect Al5Ti1B alloy additions on Al-Si system is a special case where Si above few percent poison refinement resulting in larger sizes. Consideration complicating poisoning these...
Abstract In laser powder bed fusion additive manufacturing (LPBFAM), different solidification conditions, e.g., thermal gradient and cooling rate, can be achieved by controlling the process parameters, such as power speed. Tailoring behaviour of columnar to equiaxed transition (CET) printed alloy during fabrication facilitate production highly customized microstructures. this study, effective analytical solutions for both conduction are employed model solidifying melt pools. Microstructure...
Multi-faceted experiments were conducted to measure the properties of several mould slags needed for fundamental characterization heat transfer and friction in interfacial gap between shell during continuous casting (CC) steel. A novel apparatus was used coefficient solidified flux copper at elevated temperatures. The measured softening temperature is interpreted as glass transition extrapolate slag viscosity-temperature curves far into low – high viscosity region. Continuous-cooling...
Abstract Plutonium oxalate supernatant requires a treatment step for further recovery of the residual Pu. As ion present in solution poses problems during Pu, it needs to be destroyed. In work, Mn 2+ based catalytic destruction was studied detail, as could minimize generation secondary radioactive waste compared conventional process. The effect various parameters, namely concentrations HNO 3 , catalyst, oxalic acid and metal has been studied. Moreover, robustness method along with kinetics...