ASM International San Fernando Valley Chapter Presents

March 2010 Meeting

Speaker: Byungmin Ahn, USC Topic: Ultrafine-grained Al alloy and composite with multi-scale grain structure Speaker Bio: Current Appointment Research Associate, University of Southern California Research Area Nanocrystalline Aluminum Alloys and Composites Education PhD, 2008, University of Southern California MS, 2003, University of Southern California BS, 2002, SungKyunKwan University, Korea Abstract: Nanocrystalline or ultrafine-grained Al alloys are often produced by severe plastic deformation methods and exhibit remarkably enhanced strength and hardness compared to conventional coarse-grained materials, resulting in great potential for structural applications. To achieve nanocrystalline structure, grains were refined by cryomilling, and the cryomilled powder was subsequently consolidated into bulk form. To improve insufficient ductility and toughness of nanocrystalline materials, an intelligent design with microstructural modification was introduced by generation of multiple size scales. A bimodal grain structure consisting of nanocrystalline grains and inclusions of coarse-grained material was produced by consolidation of blended powders. The resulting materials exhibited enhanced ductility compared to 100% nanocrystalline materials, with only moderate decreases in strength. A similar process was used to produce hybrid trimodal microstructures comprised of regions of nanocrystalline and coarse grains, as well as hard ceramic particles, providing super-high compressive strength.

San Fernando Valley Thanks it's Sustaining Members
		Pratt Whitney Rocketdyne

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