Precipitation of silicon from splat-cooled Al-Si alloys

Microstructural evolution during annealing of a rapidly solidified Al–12Si alloy

“…The former are dominated by nano-size Si particles which are segregated so as to form a cellular structure which is too fine to be identified at optical microscope resolutions. The average cell size is estimated from TEM micrographs to be approximately 0.5 m corresponding to a cooling rate, on the order of 10 6 K/s [14]. The featureless zone revealed along the wheel-side in ribbons thinner than 20 m [12], is claimed to be associated with a very rapidly moving solidification front, which reduces partitioning and leads to extensive solute trapping.…”

Denuded Zones in Czochralski Silicon Wafers

“…Work has been done to investigate the formation of the denuded zone on silicon wafers under different heat-treatment conditions. Denuded zones ranging from a few microns up to 170 microns have been observed by different authors (Matyja et al, 1975;Magee et al, 1981;etc. ).…”

Synthesis of nanostructured spherical aluminum oxide powders by plasma engineering

“…Hence, a relationship between dendrite size and cooling rate can be expressed through the equation given by Matyja et al [18] as [2] where d is dendrite arm spacing in microns, Q avg is average cooling rate (K/s), n is average cooling rate exponent dependent on material, and c is material constant. The ideal value of n is sited in the literature at 1/3, corresponding to a near spherical domain of solidified volume.…”

“…Similarly, for the water-quenched and liquid nitrogen-quenched plasmasprayed particles, we have considered the crystallite size of the particles as was measured by XRD analysis. Matyja et al [18] and Sampath and Herman [19] have laid a foundation for calculating the cooling rates, so the effect of cooling rate was detailed for air, water, and liquid nitrogen quenching medias using Eq. [2].…”