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Positron Lifetime (ns)

Positron Lifetime (ns). Normalized Intensity (%). CAREER: Development of a Structurally Based Plastic Flow Model for Bulk Metallic Glasses Katharine M. Flores, Ohio State University, DMR 0449651.

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Positron Lifetime (ns)

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  1. Positron Lifetime (ns) Normalized Intensity (%) CAREER: Development of a Structurally Based Plastic Flow Model for Bulk Metallic GlassesKatharine M. Flores, Ohio State University, DMR 0449651 Motivation: Bulk metallic glasses (BMGs) have potential as structural materials due to their excellent mechanical properties. However, the atomic scale “open volume” defects responsible for plastic flow are poorly understood and therefore difficult to control. Log (electron density) Positron Annihilation Spectroscopy reveals three types of “open volume” regions in Zr-, Fe-, and Al-based glasses. Their sizes and concentrations evolve with deformation. Molecular Dynamics Simulations examine the electron density to characterize the distribution of “open volume” and the local changes associated with flow.

  2. CAREER: Development of a Structurally Based Plastic Flow Model for Bulk Metallic GlassesKatharine M. Flores, Ohio State University, DMR 0449651 Broad Impact Research: Better understanding of the glass structure and flow mechanisms are necessary for the broad utilization of BMGs. Such understanding plays a direct role in the development of new alloys with optimized properties. This work complements other ongoing programs on novel processing and joining techniques. Dissemination: Work from this program has been discussed in high profile journal articles, including Acta Materialia (2007;55:3403), J. Mechanics and Physics of Solids(2006;54:2418), and MRS Bulletin(2007;32:629). It has been the subject of 8 conference presentations to date, including 4 invited presentations and 3 with student first authors. Preparation of New Scientists and Engineers: Ashwini Bharathula (Ph.D. candidate) joined our group in Fall 2005. Her work balances mechanical testing, microscopy, and computational studies. Weiqi Luo (Ph.D. candidate) began his BMG research in Spring 2007. He is developing computational methods for the structural analysis of glasses. Olivia Rumpke (UG research student) joined our group in Summer 2007. She is investigating fatigue of BMGs following plastic deformation. Jeanne Skebo (UG research student) investigated solid state joining techniques during Summer 2006.

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