Elemental partitioning in directionally solidified NiAl single crystals
作者： G. Vaerst , W. Löser , M. Leonhardt , I. Bächer
DOI: 10.1016/0966-9795(95)97290-H
关键词: Nial 、 Crystallography 、 Materials science 、 Crystal growth 、 Single crystal 、 Partition coefficient 、 Stoichiometry 、 Thermodynamics 、 Directional solidification 、 Intermetallic 、 Crystal
摘要: Abstract Elemental partitioning effects caused by crystal growth processes in binary NiAl alloys are revealed. The directional solidification process is analysed terms of a model having regard to composition dependent partition coefficient. predictions compared with electron probe microanalysis results elemental distributions within the and related microhardness determinations. Deviations melt from stoichiometry NiAl intermetallic compound give rise continually increasing deviations (excess Al or Ni) along rod axis also radial segregation resulting considerable fluctuations single crystal. These effects, which particularly important for large initial stoichiometry, ascribed solute accumulation residual (macrosegregation direction) convection (radial inhomogeneities).
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