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Microstructure and Solid/Liquid Interface Evolutions of Directionally Solidified Fe-Al-Ta Eutectic Alloy

  • Chunjuan Cui (崔春娟)Email author
  • Songyuan Wang
  • Meng Yang
  • Haijun Su
  • Yagang Wen
  • Pei Wang
  • Chiqiang Ren
Metallic Materials
  • 4 Downloads

Abstract

A modified Bridgman directional solidification technique was used to prepare Fe-Al-Ta eutectic in situ composites at different growth rates ranging from 6 to 80 µm/s. The directionally solidified Fe-Al-Ta eutectic composites are composed of two phases: Fe(Al,Ta) matrix phase, and Fe2Ta(Al) Laves phase. Solidification microstructure is affected by solidification rate. Microstructure of the Fe-Al-Ta eutectic alloy grown at 6.0 µm/s is broken-lamellar eutectic. Eutectic colonies are formed with the increase of the solidification rate. Microstructures are mainly composed of the lamellar or fibrous eutectic at the center of the colony and coarse lamellar eutectic zone at the boundary. Meanwhile, the inter-lamellar spacing (or the inter-rod spacing) is decreased. The spacing adjustments are also observed in Fe-Al-Ta eutectic alloy. The solid/liquid interface evolves from planar interface to shallow cellular interface, then to deep cellular, and finally to shallow cellular planar with the increase of the solidification rate.

Key words

directional solidification solidification rate eutectic alloy solid/liquid interface 

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Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2019

Authors and Affiliations

  • Chunjuan Cui (崔春娟)
    • 1
    • 2
    Email author
  • Songyuan Wang
    • 1
  • Meng Yang
    • 1
  • Haijun Su
    • 1
  • Yagang Wen
    • 1
  • Pei Wang
    • 1
  • Chiqiang Ren
    • 1
  1. 1.School of Metallurgical EngineeringXi’an University of Architecture and TechnologyXi’anChina
  2. 2.Shaanxi Engineering Technology Research Center for Wear-resisting MaterialsXi’anChina

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