A5072008941- Microstructure and mechanical properties
- Advanced ceramic materials synthesis
- Aluminum Alloys Composites Properties
- Advanced materials and composites
- Metallurgy and Material Forming
- Aluminum Alloy Microstructure Properties
- Intermetallics and Advanced Alloy Properties
- High Temperature Alloys and Creep
- Metal and Thin Film Mechanics
- Metal Forming Simulation Techniques
- Nuclear materials and radiation effects
- Microstructure and Mechanical Properties of Steels
- High-Velocity Impact and Material Behavior
- Glass properties and applications
- Magnesium Alloys: Properties and Applications
- High-Temperature Coating Behaviors
- Metal Extraction and Bioleaching
- High Entropy Alloys Studies
- nanoparticles nucleation surface interactions
- Metal Alloys Wear and Properties
- Metallic Glasses and Amorphous Alloys
- Recycling and utilization of industrial and municipal waste in materials production
- Surface Treatment and Residual Stress
- MXene and MAX Phase Materials
- Nuclear Materials and Properties
Indian Institute of Science Bangalore
2014-2024
American Ceramic Society
1986-2010
University of Colorado Boulder
2009
Massachusetts Institute of Technology
2005
University of California, San Diego
1989-1994
University of California, Davis
1986-1990
University of Southern California
1985-1990
University of California System
1988
Etude experimentale de la variation durete en fonction grosseur grain pour des materiaux nanocristallins. En contraste avec relation Hall-Petch, cette analyse, realisee sur le cuivre et palladium a temperature ambiante, montre un decroissement lorsque decroit. Ces resultats sont expliques termes d'apparition d'un fluage diffusionnel, dans les grains ultrafins
We show that the application of a modest dc electrical field, about 4 V/cm, can significantly reduce grain growth in yttria‐stabilized polycrystalline zirconia. These measurements were made by annealing samples, for 10 h at 1300°C, with and without an field. The finding adds new dimension to role applied fields sintering superplasticity, phenomena are critical net‐shape processing ceramics. Grain‐growth retardation will considerably enhance rates leading significant energy efficiencies
Whisker‐reinforced ceramic composites with enhanced fracture toughness properties are being developed. The creep behavior of such a composite was studied. introduction silicon carbide whiskers significantly improves the resistance polycrystaline alumina.
A CoCrFeMnNi high-entropy alloy (HEA) showed elongation to failure ∼320% at T = 1023 K and a strain rate . Strain hardening texture weakening occurred low , whereas flow softening strengthening were observed high experiments. The sensitivity (m) decreased from 0.5 ∼0.25 with increasing Deformation m∼0.5 deformation-enhanced grain growth indicated superplasticity associated boundary sliding. diffusion coefficient diminished by factor of ∼4 in the HEA. Concurrent nucleation, cavity...
Grain boundaries provide strength to materials at low temperatures by impeding slip transfer and they weaken high intergranular creep processes such as grain boundary sliding (GBS) diffusion creep. At very fine nanocrystalline sizes of <10 nm, it is possible observe weakening rather than strengthening room temperature. Superplastic flow observed in a wide range materials, but the common phenomenology strain rate sensitivity extensive GBS may arise from varying importance accommodated...
The creep mechanisms in ceramics are reviewed briefly and then compared with experimental data. It is shown that there three major types of behaviour: a stress exponent close to 5 due control by dislocation climb fully ductile behaviour; 3 from Bardeen–Herring sources less than jive interpenetrating independent slip systems; 1 diffusion creep. role interface reaction the transitions power law also examined.MST/1389