MSE Colloquium: Stan David, Friction Technology for Processing of Advanced Materials: Challenges and Opportunities

Abstract

Friction technology embraces a growing range of variants for both joining and materials processing. Friction stir processing (FSP) is an innovative solid state process that utilizes frictional heat combined with forging pressure to cause extensive deformation that softens the material. Friction stir welding (FSW) is a solid state process that can be used for welding. Some of the friction processing techniques developed and invented at The Welding Institute (TWI) includes not only FSW but also friction surfacing, friction extrusion and rotary friction welding. Of these various processes the process that has gained the most attention is FSW. The principles of the process can also be used to modify the microstructure and produce nano structured materials. 

The presentation will describe the development of FSW and its applications with examples, to join low temperature materials, advanced materials, and surface modification to improve mechanical properties of casting. Also the presentation describes the extension of the process to produce nano structured materials and extrusion of aluminum alloys. Finally, the presentation points out some of the opportunities and challenges for further advancement of the science and technology of FSP.

Bio

Dr. David received his Ph.D. degree in Metallurgical Engineering from the University of Pittsburgh.  He was adjunct professor at the University of Pittsburgh and Colorado School of Mines, and a Visiting Professor at Coventry University, Coventry, United Kingdom.  

Currently he is a consultant at Oak Ridge National Laboratory ( ORNL ) He joined ORNL in 1977 and in 2008 retired as a Corporate Fellow of UT-Battelle, and Group Leader of the Materials Joining Group in the Materials Science and Technology Division.  He is a Fellow of The Minerals, Metals, and Materials Society (TMS), American Association for the Advancement of Science, ASM International and the American Welding Society.  He is the Editor-in-Chief of a new journal, “Science and Technology of Welding and Joining,” published by the Institute of Materials, London.  

He is the recipient of several major awards: To mention a few The Arata Prize from the International Insitute of Welding, Distinguished Alumnus Award fom the University of Pittsburgh, the Elegant Work Prize of the Institute of Materials, London, for his publications on single crystal welding.  In 1994 he was the recipient of the Champion H. Mathewson award from The Minerals, Metals and Materials Society and was awarded the 1981 Lincoln Gold Medal by the American Welding Society.

He has contributed to over 300 papers in the fields of solidification and welding metallurgy and is the editor of eight international conference proceedings.