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<p><i>In situ</i> experimental observation found ascending solute plume is prevalent during bottom-up directional solidification in Ga–In alloy, but it disappears when solidification direction changes to top-down, which clearly demonstrates gravity effect on solute flow. Moreover, we found that size reduction in cross section can significantly accelerate thermo-solutal convection close to the wall and thus there has a higher propensity of freckle formation, in stark contrast to the behavior when sectional size is increased.</p>

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In Situ Observation of Gravity and Size Effects on Thermo-Solutal Convection During Directional Solidification

  • 期刊论文

  • 发表日期：

    2025年5月15日

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  • Di Wang,
  • Jingzhe Wang,
  • Bowen Chen,
  • Dexin Ma,
  • Wenkai Deng,
  • Yunxing Zhao,
  • Weitai Xu,
  • Yong Liu,
  • Zaiwang Huang

摘要

In situ experimental observation found ascending solute plume is prevalent during bottom-up directional solidification in Ga–In alloy, but it disappears when solidification direction changes to top-down, which clearly demonstrates gravity effect on solute flow. Moreover, we found that size reduction in cross section can significantly accelerate thermo-solutal convection close to the wall and thus there has a higher propensity of freckle formation, in stark contrast to the behavior when sectional size is increased.