Overall effects of initial melt undercooling, solute segregation and grain boundary energy on the grain size of as-solidified Ni-based alloys
作者： Feng Liu , Gencang Yang , Reiner Kirchheim
DOI: 10.1016/J.JCRYSGRO.2003.12.057
关键词:
摘要: Abstract An analysis of the effects nucleation, growth and recalescence on primary solidification undercooled Ni-based alloy melts was presented. If initial melt undercooling, ΔT, is above critical value, ΔT*, grain refinement occurs as a result solid-state recrystallization arising from strain effect recalescence. The size as-solidified dominated by its response to recrystallization, i.e. ΔT. According Gibbs’ adsorption equation McLean's boundary (GB) segregation model, thermodynamic model then proposed that attributes combined solute segregation, GB energy, σb. In example systems studied, DD3 superalloy Ni75Cu25 alloy, modeling showed close agreement with experimental results. As compared it interpreted due larger enthalpy change higher concentration lead smaller in superalloy.
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