ASM International San Fernando Valley Chapter Presents

February 2010 Meeting

Speaker: Khin Lay Maung, UC Irvine Topic: Nanocrystalline Bulk Materials and stability of the grain size Biography: Khin Lay Maung is a PhD student in the Materials Science program at the University of California, Irvine. He received his M.S. degree in Materials Engineering from California State University at Northridge and B.S. degree in Metallurgical and Materials Engineering from Middle East Technical University, Turkey. His research work is related to grain size stability of nanocrystalline aluminum under the supervision of Farghalli Mohamed. He is also working on experimental observation of grain boundary sliding in nanocrystalline bulk materials with the grain size of less than 100 nm. Abstract: Nanocrystalline (nc) materials are generally considered to have a grain size that is in the range of 1-100 nanometers. These materials have unique features that are different from their conventional counterparts. One method of obtaining nc-materials is through a process known as cryomilling, which is the mechanical attrition of powders within a cryogenic medium. The drawback of this route is that the consolidation of these powders requires a high temperature process such as hot isostatic pressing, HIPping, that can give rise to grain growth. In this presentation, the speaker will discuss the possibility of maintaining the grain size under the 100 nm mark even at temperatures up to 75% of the melting temperature. This thermal stability has been achieved by adding nanosized particles called diamondoids.

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