The Center For The Accelerated Maturation of Materials

Research Interests:
Physical metallurgy, phase transformations, mechanical behavior, structure-property relations and analytical transmission electron microscopy of advanced structural materials, high temperature alloys, intermetallics, metal-matrix composites., Rapid prototype processing through LENS (Laser Engineered Near-Net Shape) processing

Brief Summary of the Research Experience

High Resolution and Analytical Electron Microscopy of structural, high temperature materials and nano-structures.
Microstructure effects on the Creep Behavior in g/g Ni-base superalloys (DARPA)
Analytical Modeling of Creep behavior in g/g Ni base superalloys
Nano scale mechanical properties in bulk a/b Ti alloys (CAMM)
Quantification of microstructural features in a/b Ti alloys using three-dimensional stereology
Microstructure based Neural Network modeling of tensile and Fracture toughness in a/b Ti alloys. (CAMM)
Texture studies in forged and heat treated Ti-6246 Alloy Forgings (Ladish)
Neutron-Diffraction study of phase transformations by tracking Texture Evolution with Temperature in Ti-6Al-4V.
Friction Stir Welding of Ti alloys (NSF)
Microstructural Effects on the Deformation Behavior of a, a/b Titanium Alloys (AFOSR)
Effect of Interstitial Elements on Creep of Lamellar Gamma Titanium Aluminides (NSF)
Single Crystal Growth Studies in Ti-(2-6)Al based Titanium alloys
Phase transformation, Deformation and Strengthening Mechanisms in Ti-48Al alloy

G. B. Viswanathan, S. Karthikeyan, P. M. Sarosi, R. R. Unocic and M. J. Mills, “Microtwinning During Intermediate Temperature Creep pf Polycrystalline Ni Base Superalloys: Mechanism and Modeling, Philosophical Magazine A (in press).
D. Bhattacharyya, G.B. Viswanathan, S.C. Vogel, D.J. Williams, V. Venkatesh and H.L. Fraser, “A Neutron-Diffraction Study of Phase Transformations by Tracking Texture Evolution with Temperature in Ti-6Al-4V’”, Scripta Materialia (2006), 54(2), 231-236.
S. Kar, T. Searles, E. Lee, G.B. Viswanathan, J. Tiley, R. Banerjee, and H. L. Fraser, “Modeling the Tensile Properties in -Processed  Ti Alloys”, Submitted to Metallurgical and Material Transactions A (2006), 37A, 559-566.
G.B Viswanathan, Eunha Lee, Dennis M. Maher, S. Banerjee and Hamish L. Fraser, "Direct Observations and Analyses of Dislocation Substructures in the phase of an  Ti-alloy formed by Nanoindentation”, Acta Materialia (2005), 53(10), 5101-3057
D. Bhattacharyya, G. B. Viswanathan, Hamish L. Fraser,, "The Role of Crystallographic and Geometrical Relationships of Side Plate  with Prior  Grain Boundaries in an  Titanium Alloy", submitted to Acta materialia (2005).
G. B. Viswanathan, P. M. Sarosi, M. F. Henry, D. D. Whitis, W. W. Milligan and M. J. Mills, “Investigation of creep deformation mechanisms at intermediate temperatures in Rene 88 DT”, Acta Materialia (2005), 53(10), 3041-3057.
G.B Viswanathan, Eunha Lee, D. M. Maher, S. Banerjee and H. L. Fraser, “Direct observations of dislocation substructures formed by nano-indentation of the -phase in an  titanium alloy”, Materials Science and Engineering A, in press (2005).
G. B. Viswanathan, P. M. Sarosi, M. F. Henry, D. D. Whitis and M. J. Mills, “Deformation mechanisms at intermediate creep temperatures in the Ni-base superalloy Rene88 DT”, Materials Science and Engineering A, in press (2005).
P. M. Sarosi, G. B. Viswanathan, M. F. Henry, D. D. Whitis and M. J. Mills, “Imaging and characterization of fine ' precipitates in a commercial nickel-base superalloy”, Ultramicroscopy (2005), 103(1), 83-93.
Seung Min Han,; R. Shah, R. Banerjee, G. B. Viswanathan, B. M. Clemens, W.D. Nix, “Combinatorial studies of mechanical properties of Ti-Al thin films using nanoindentation”, Acta Materialia (2005), 53(7), 2059-2067.