Effect of solidification conditions and surface pores on the microstructure and columnar-to-equiaxed transition in solidification under microgravity
作者： Y.Z. Li , N. Mangelinck-Noël , G. Zimmermann , L. Sturz , H. Nguyen-Thi
DOI: 10.1016/J.JALLCOM.2018.03.300
关键词:
摘要: Abstract Microgravity solidification experiments were carried out in the Material Science Laboratory on board International Space Station. The influence of grain refinement, rotating magnetic field (RMF) and surface pores microstructure columnar-to-equiaxed transition (CET) investigated two selected Al-based samples solidified under microgravity conditions. increase furnace pulling velocity leads to a finer dendrite structure, smaller eutectic percentage more uniform distribution interdendritic regions. On one hand, refinement ensures occurrence CET, which is progressive studied experiment because high temperature gradient. other non-refined alloy RMF applied during fails trigger forced liquid flow too weak compared front transport fragments from mushy zone above front. presence at sample peculiarity weakens decrease arm spacing for both samples. These effects are ascribed extra into due pore that promotes growth dendrites along direction, resulting elongated grains postponing CET refined alloy.
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