Nucleation potency of eutectic phases

Crystalline surface phases of the liquid Au-Si eutectic alloy

Oleg G. Shpyrko,1,2,* Reinhard Streitel,1 Venkatachalapathy S. K. Balagurusamy,1 Alexei Yu. Grigoriev,1 Moshe Deutsch,3 Benjamin M. Ocko,4 Mati Meron,5 Binhua Lin,5 and Peter S. Pershan1 1Department of Physics and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA 2Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 604...

Nucleation of ordered phases in block copolymers.

Nucleation of various ordered phases in block copolymers is studied by examining the free-energy landscape within the self-consistent field theory. The minimum energy path (MEP) connecting two ordered phases is computed using a recently developed string method. The shape, size, and free-energy barrier of critical nuclei are obtained from the MEP, providing information about the emergence of a s...

Continuity of the nucleation of bulk and surface phases.

Nucleation of a new bulk phase is almost always heterogeneous: It occurs at a surface. Nucleation of a new surface phase also occurs at a surface of course. We study nucleation in an Ising model with both bulk and surface (prewetting) transitions. We find no clear distinction between nucleation of the bulk and surface phases. As the bulk transition is crossed, the phase that is nucleating chang...

Study of Heterogeneous Nucleation of Eutectic Si in High-Purity Al-Si Alloys with Sr Addition

Al-5 wt pct Si master-alloys with controlled Sr and/or P addition/s were produced using super purity Al 99.99 wt pct and Si 99.999 wt pct materials in an arc melter. The master-alloy was melt-spun resulting in the production of thin ribbons. The Al matrix of the ribbons contained entrained Al-Si eutectic droplets that were subsequently investigated. Differential scanning calorimetry, thermodyna...

Evidence of eutectic crystallization and transient nucleation in Al89La6Ni5 amorphous alloy