Mechanism of competitive grain growth in directional solidification of a nickel-base superalloy

Yizhou Zhou, A Volek, Nicholas Green

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

The structure evolution of bicrystal (BC) samples during directional solidification (DS) was explored in an attempt to understand the mechanism of competitive grain growth. It was found that in the case of diverging dendrites the favorably oriented grain overgrows the misaligned grain. However, in the case of converging dendrites the result differs from the prediction of the generally accepted model for competitive grain growth. First, the unfavorably oriented dendrites are able to overgrow the favorably oriented dendrites. Second, the misaligned grain overgrows the favorably oriented grain by blocking the dendrites of the favorably oriented grain at the grain boundary. Based on the experimental results, the process by which a favored [0 0 1] texture is developed during DS process of a nickel-base super-alloy is illustrated. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)2631-2637
Number of pages7
JournalActa Materialia
Volume56
Issue number11
DOIs
Publication statusPublished - 1 Jun 2008

Keywords

  • nickel alloys
  • directional solidification
  • theory
  • grain growth

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