Solution of the direct alloy solidification problem including the phenomenon of material shrinkage

In the paper we describe the solution technique for solving the direct problem of the alloy solidifying within the casting mould with the phenomenon of material shrinkage taken into account. Due to the difference between densities of the liquid and solid phases, the shrinkage of metal often appears during the solidification. The investigated process is modeled by means of the solidification in the temperature interval basing on the heat conduction equation with the source element enclosed which includes the latent heat of fusion and the volume contribution of solid phase. Whereas the shrinkage of metal is modeled by the proper application of the mass balance equation.

High Resolution X-Ray Diffraction of Hg1-xMnx Te Epitaxial Films

ABSTRACTEpitaxial films of Hg1-xMnxTe (MMT) have been grown by direct alloy growth MOVPE. Perfection of layers grown on CdTe buffered GaAs, and unbuffered CdZnTe substrates has been assessed by double axis X-ray diffraction. No significant difference was observed in the rocking curve full width at half maximum (FWHM) between layers grown on the two types of substrate. Rocking curves taken as a function of position across the layer showed substantial variation, there being a very good correlation between layer thickness determined from the intensity of the substrate peak, layer rocking curve FWHM and Mn composition determined from the substrate and layer peak splitting. The contour maps of these parameters are discussed in terms of depletion of the DIPTe precursor.