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Highly monodisperse core¨Cshell particles created by solid-state reactions V. Radmilovic1,2*, C. Ophus1, E. A. Marquis3, M. D. Rossell1,4, A. Tolley1,5, A. Gautam1, M. Asta1,6 and U. Dahmen1 The size distribution of particles, which is essential for many properties of nanomaterials, is equally important for the mechanical behaviour of the class of alloys whose strength derives from a dispersion of nanoscale precipitates. However, particle size distributions formed by solid-state precipitation are generally not well controlled. Here we demonstrate, through the example of core¨Cshell precipitates in Al¨CSc¨CLi alloys, an approach to forming highly monodisperse particle size distributions by simple solid-state reactions. The approach involves the use of a two-step heat treatment, whereby the core formed at high temperature provides a template for growth of the shell at lower temperature. If the core is allowed to grow to a sufficient size, the shell develops in a ¡®size focusing¡¯ regime, where smaller particles grow faster than larger ones. These results suggest strategies for manipulating precipitate size distributions in similar systems through simple variations in thermal treatments. good idea£¡ |
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