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(a) Specific heat of Al 88 Y 7 Fe 5 showing a clear T g .

Kinetic modeling in aluminum based metallic glasses John H. Perepezko , University of Wisconsin-Madison, DMR 1005334.

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(a) Specific heat of Al 88 Y 7 Fe 5 showing a clear T g .

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  1. Kinetic modeling in aluminum based metallic glassesJohn H. Perepezko, University of Wisconsin-Madison, DMR 1005334 Aluminum-based glass alloys belong to a material class that undergoes primary crystallization during devitrification. In these alloys, AlFCCnanoparticle formation results in a significant enhancement of mechanical properties (e.g. three times the specific strength of steel). Focused development of a nucleation model allows for predictive capabilities in the size and number density of the crystalline phase. When combined with (a) detailed specific heat measurements near Tg, the model givesnew insight into the energetic and transport properties during the nucleation process. The controlling diffusion coefficients (b) indicate steep temperature and composition dependent properties. This advancement gives critical information for model development concerning particle nucleation and growth (c). (a) Specific heat of Al88Y7Fe5 showing a clear Tg. (b) Diffusion coefficient for cluster growth near r*. 50nm 50nm 50nm 50nm Al88Y7Fe5 @247°C (c) Representative BFTEM images of developing nanoparticles and their size distributions with time.

  2. Kinetic modeling in aluminum based metallic glasses John H. Perepezko, University of Wisconsin-Madison, DMR 1005334 During the current year Professor Perepezko was involved in the following activities: • Through the ASM-International he assisted in a summer materials camp for Milwaukee area H.S. students. • Collaborated with colleagues at Tohoku University (Sendai, Japan) on amorphous alloys and crystallization kinetics research. • Organized undergraduate “Foundry Fun Night” at UW-Madison to introduce students to metal casting. • Was an invited speaker at a solidification workshop at Northwestern Polytechnic University, Xi’an, China. • Was a discussion leader at the Physical Metallurgy Gordon Conference • Seth Imhoff, graduate student on the project, received his Ph. D. degree and participated in a Gordon Res. Seminar. Demonstration of melt spinning

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