Mechanical Engineering Department
Materials Science & Engineering

Seminars 2002-2003

Studies of Nanostructured Al93Fe3Cr2Ti2 for High Temperature Structural Applications

Thursday, February 27, 2003 4:30 PM Washburn 229

Presented by: Leon L. Shaw
Department of Metallurgy and Materials Engineering
University of Connecticut, Storrs, CT 06269

The feasibility of making nanostructured Al93Fe3Cr2Ti2 alloys via mechanical alloying (MA) starting from elemental powders has been investigated, and the potential of the MA-processed Al93Fe3Cr2Ti2 alloy for high-temperature structural applications has been examined. It is found that the Al93Fe3Cr2Ti2 alloy at the as-milled condition is composed of nanostructured, supersaturated fcc-Al solid solutions with high internal strains. The nanostructure of the Al93Fe3Cr2Ti2 alloy is retained after extrusion as well as after exposure to elevated temperatures as high as 5000C (0.83Tm of pure Al). The unusually stable microstructure is due to low diffusivities of the alloying elements and the presence of nanoscale intermetallic precipitates. Because of the retention of nano-grains (fcc-Al < 100 nm after extrusion), the presence of nanoscale intermetallic precipitates, and low diffusivities of the alloying elements, promising mechanical properties (i.e., superior compressive strength and ductility) at both ambient and elevated temperatures have been demonstrated in the MA-processed Al93Fe3Cr2Ti2 alloy.

Prof. Leon Shaw received a B.S. in Materials Engineering and a Master of Engineering in Mechanical Engineering from Fuzhou University (China), as well as a Master of Science and a Ph.D. in Materials Science and Engineering with a Minor in Mechanics and Engineering Science from the University of Florida. He worked as a Research Scientist at Systran Corporation and as a Visiting Scientist at Air Force Wright Laboratory for 2 years before joining the University of Connecticut in 1995.

His teaching and research interests are in processing and mechanical properties of nanostructured metals and their composites. He is an author and co-author of over 110 publications (66 archival refereed journal articles and 51 conference proceedings), 2 book chapters, and 122 conference presentations including 26 invited talks. He holds a US patent for large quantity production of nanostructured materials.

He is a guest editor for several journals including Metallurgical and Materials Transactions and Materials Science and Engineering. He is cited in Who's Who in America. He has received several awards including the Outstanding Junior Faculty Award from the UConn School of Engineering (2000) for his exceptional contributions in research and teaching at UConn.

Monday, November 25th, 2002, 11:00 AM, Washburn 323

Presented by Professor Baicheng Liu
Department of Mechanical Engineering
Tsinghua University
Beijing, China

The presentation focused on the modeling and numerical simulation of solidification process of ferrous and non-ferrous castings, including, heat transfer, microstructure and fluid flow in mold filling. Prediction of defects such as shrinkage, deformation and hot cracking will be also addressed.

Professor Baicheng Liu has been with the Department of Mechanical Engineering, Tsinghua University, Beijing, China since he graduate in 1955 with a Gold Medal. He is an academician of the Chinese Academy of Engineering. As a Visiting Scholar, he worked in University of Wisconsin-Madison and Massachusetts Institute of Technology from 1978 to 1981. His major research interests and expertise are fundamental study and modeling of aluminum and magnesium alloys net shape casting, and physical metallurgy of cast alloys as well. His research has been recognized worldwide. He is now in charge of several national research projects on Macro and Micro Modeling of Casting and Solidification Processes of Aluminum and Magnesium Alloys funded by the State Ministry of Science and Technology, the National Natural Science Foundation of China, etc.

Prof. Liu has fulfilled 20 research projects and holds two patents. He won many awards from the Chinese government for teaching and research, as well as, two awards from the United States. He has published more than 260 papers. He has visited more than 20 universities in different countries around the world where he has given seminars. He presented more than 20 papers and several keynote speeches at different international conferences. He is also the editor of "International Journal of Cast Metal Research".

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