Topic：Nanocomposites by Mechanical Alloying
Speaker：Professor C. Suryanarayana, University of Central Florida
Date：3:00 p.m. Friday, 21st, April, 2017
Venue：Meeting Room 301, NO. 38 Building
About the Speaker
Professor C. Suryanarayana is currently a Professor at the University of Central Florida (UCF) in Orlando. He obtained his Ph.D. from Banaras Hindu University in Varanasi, India, where he taught until he came to the US. His main research expertise includes non-equilibrium processing of materials, with special emphasis on mechanical alloying, to synthesize nanostructured materials and nanocomposites. His other research interests include metallic glasses, bulk metallic glasses, and coatings. He has published over 350 technical papers and authored/edited 21 books and conference proceedings. He has also been a member of the editorial boards of several international journals.
Professor Suryanarayana is a Fellow of ASM International, Fellow of the Institute of Materials, Minerals and Mining, London, UK, and Fellow of the Electron Microscope Society of India. He is one of the most cited researchers in the field of materials science and engineering. He has over 18,000 citations to his research work with an h-index of 50 and i-10 index of 167. According to Thomson Reuters, he is as one of the top 40 researchers in the world in the field of materials science who achieved the highest citation impact scores for their papers published since January 2000.
Professor Suryanarayana received many awards for his research contributions, including the National Metallurgists’ Day Award of the Government of India, Pandya Silver Medal of the Indian Institute of Metals, Science Academy Medal for Young Scientists by the Indian National Science Academy, and Distinguished Alumnus award from Banaras Hindu University, Lifetime Achievement Award in Engineering by Central Florida Engineers and the Lifetime Achievement Award in Electron Microscopy from India. During 2012-2013, he was a Jefferson Science Fellow and Senior Science Advisor at the U.S. Department of State in Washington, D.C. Most recently, he was awarded the prestigious 2016 TMS Educator Award.
Report Summaires:
Nanostructured materials with a grain size of less than about 100 nm possess interesting properties including high strength, enhanced diffusivity, improved sintering characteristics, good ductility in some cases, and novel magnetic properties. The properties of these materials can be further improved by synthesizing nanocomposites containing ceramic or other phase particles. The present talk describes our recent research efforts in synthesizing nanocomposites based on Al, Ti and Mo by mechanical alloying. Mechanical alloying is an advanced powder metallurgy technology, which involves repeated cold welding, fracture, and rewelding operations, leading to the formation of uniform distribution of the reinforcement phase in a metal matrix. The major goal of these investigations was to determine the maximum amount of nanometric reinforcement phase that can be uniformly incorporated into the metal matrix by mechanical alloying methods. Results on the synthesis and microstructural and mechanical characterization of Al-Al2O3, TiAl-Ti5Si3, and MoSi2-Si3N4 nanocomposite systems will be described. We were able to introduce 50 vol.% of the Al2O3 phase of 50 nm size in Al, achieve superplastic deformation in a TiAl-60 vol.% Ti5Si3 composite, and determine the fracture toughness in a MoSi2-Si3N4 composite.
