Shankar Sastry photo

Shankar M. L. Sastry

Christopher I. Byrnes Professor of Engineering

Professor of Metallurgy and Materials Science
Department of Mechanical Engineering and Materials Science
Washington University in St. Louis
Campus Box 1185
St. Louis, MO 63130-4899

email: sastrys@seas.wustl.edu
Jolley Hall 209
Phone: +1 (314) 935-4869
FAX: +1 (314) 935-401

 

 

Research Interests


Severe Plastic Deformation Processing for Microstructural Refinement and Mechanical Property Improvements of Structural Materials.

Sustainable Materials

Biomimetic Materials

 

 

Recent Publications

 

G.A. Colombo, and S.M.L. Sastry, "Strength and Fatigue Improvementsof Metastable Beta Titanium Alloys by Boron Additions and Equal Channel Angular Extrusion," in Medical Device Materials V, Ed. By Jeremy Gilbert, Pub. ASM International, (2010), p 80.

 

V Protasov, G Colombo, S M.L. Sastry, and M. Ashraf Imam, Microstructural Refinement and Mechanical Property Improvements of Ti-5Al-1Sn-1V-1Zr-0.76Mo alloy by Equal Channel Angular Extrusion Processing, Materials Science Forum, Vols. 561-565, pp 175-178, Trans. Tech. Pub, Switzerland(2007).

 

S.M.L. Sastry, S.V. Dobatkin, and S.V. Sidorova, Formation of a Submicrocrystalline Structure in 10G2FT Steel upon Equal Channel Angular Pressing Followed by Heating, Russian Metallurgy (Metally), No. 2, (2004), p. 129

 

S.M.L. Sastry, R. Mahapatra, and A.W. Davis, “Ductile L12 Rh3Ti intermetallics for Ultra-high temperature applications , Materials Science and Engineering, A329-331, (2002), P. 486

 

S.M.L. Sastry and R.N. Mahapatra, Grain refinement of intermetallics by severe plastic deformation, Materials Science and Engineering, A 329-331 (2001), p. 872.

 

S.M.L. Sastry, R.N. Mahapatra, and D.F. Hasson, Microstructural Refinement of Ti-44Al-11Nb Alloy by Severe Plastic Deformation, Scripta Materialia, 42 (2000) 731-736

 

S.M.L. Sastry "Microstructural Refinement and Mechanical Property Improvement of Copper and Copper-Al2O3 Specimens Processed by Equal channel Angular Extrusion (ECAE)" in Investigations and Applications of Severe Plastic Deformation, Eds T.C. Lowe and R.Z. Valiev, , p273, Kluwer Academic Pub. 2000 .

 

S. M.L.Sastry, R. S. Iyer, V. Provenzano and L. Kurihara, A Comparison of the Deformation Behavior of Ultrafine Grained Copper Produced by Particulate Processing and Bulk Deformation Processing in Advanced Materials for the 21st Century: The 1999 Julia R. Weertman Symposium Eds: Y-W. Chung, D.C. Dunand, P.K. Liaw, and G.B. Olson, pp 537-545, .TMS, Warrendale, PA,2000

 

R. Suryanarayanan and S.M.L. Sastry "Consolidation of Nanoparticles-: Development of a Micromechanistic Model.", , Acta Materialia, 2000,Vol. 47, No. 10, , pp 3079-3098,

 

R. Suryanarayanan Iyer, Claire A. Frey, S.M.L. Sastry, B.E. Waller, and W.E. Buhro, "Plastic deformation of nanocrystalline Cu and Cu-0.2 wt.%B", Materials Science & Engineering, A264 , pp 210-214, 1999

 

RECENT DoD SPONSORED PROGRAMS

EQUAL CHANNEL ANGULAR EXTRUSION (ECAE) PROCESSING OF GAMMA TITANIUM ALUMINIDES AND T-6Al-4V ALLOY FOR IMPROVED PERFORMANCE, Office of Naval Research and Naval Air Warfare Center, Contract No.

The objectives of this program are to improve (i) the room temperature ductility and toughness of gamma titanium aluminides, (ii) the high temperature workability and superplasticity of gamma titanium aluminides, and (iii) the fatigue performance of Ti-6Al-4V alloy by producing ultra fine grain microstructures in the alloys by severe plastic deformation (SPD) using equal channel angular extrusion (ECAE) processing.

 

EQUAL CHANNEL ANGULAR EXTRUSION PROCESSING (ECAE) OF 2519 AL

ALLOY FOR GRAIN REFINEMENT. Naval Surface Warfare Center,

 

The objectives of the present study were to determine the feasibility of producing by ECAE fine grain microstructures in 0.25 in. and 0.5 in. rods of 2519Al alloy and evaluate the beneficial effects of fine grain microstructures on first tier mechanical properties.

 

ONGOING SPONSORED PROGRAM

 

UTILIZATION OF FLY ASH FOR FIRE-PROOF GEOPOLYMER RESINS AND ALUMINUM AND POLYMER MATRIX COMPOSITES FOR AEROSPACE AND AUTOMOTIVE APPLICATIONS
Funded by Consortium for Clean Coal Utilization, Washington University IN St. Louis,MO

Details at http://research.engineering.wustl.edu/mase/flyashproject/homepage.htm

 

RESEARCH LAB

The laboratory is equipped with a complete line of ECAE processing facilities consisting of (i) a 200 ton hydraulic press with a 300 ton side clamping hydraulic clinder, and heated ECAE Inconel 718/Rene'41 ECAE Die, (ii) a 10000 lb capacity screw-driven press equipped with a split-tube 1500oC furnace, (iii) a vacuum hot press with a vacuum capability of better that 1 x 10-5 Torr at temperatures up to 1200°C, a maximum temperature capability of 1500°C, and a load capacity of 50,000 lbs, and (iv) a 100 ton hydraulic H-frame press.

 

 

 

 

The microstructructural characterization facilities consist of a complete line of equipment for metallogrphic specimen preparation, etching, microscopic examination and image recording at magnifications up to 1000X. A Rigaku X-ray diffractometer, a Hitachi field emission scanning electron microscope, and a 200 keV JEOL 2000CX transmission electro microscope are available for detailed crystallographic structure and microstructure characterization.

The mechanical characterization facilities consist of a 10000 lb capacity screw driven computer controlled MTS machine, a 50000 lb capacity screw driven ATM machine, 10000 lb capacity screw driven ATS machine, ATS lever arm creep machine, an indentation test machine, micro and macro hardness testers, and fatigue and impact toughness testing equipment.

 

 

DEFORMATION AND MICROSTRUCTURE EVOLUTION SIMULATION

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EXPERIMENTAL VALIDATION

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