<p>Fe-Al intermetallic compounds have received much attention as one of the high-temperature structural materials. In the present study, Fe(Al, Ta)/Fe<sub>2</sub>Ta(Al) eutectic composites were prepared using the electron beam floating zone melting (EBFZM) directional solidification technique. Room and high-temperature tensile properties of the Fe(Al, Ta)/Fe<sub>2</sub>Ta(Al) eutectic composites at different solidification rates were studied. Microstructure evolution and fracture mechanism during the fracture process were analyzed using in situ tensile tests. The results show that lamellar (rodlike) Fe<sub>2</sub>Ta(Al) Laves phase becomes finer and more uniform with the increase in the solidification rate. The tensile strength of the Fe(Al, Ta)/Fe<sub>2</sub>Ta(Al) eutectic composite increases with the increase in the solidification rate at the same tensile temperature. The tensile strength of the Fe(Al, Ta)/Fe<sub>2</sub>Ta(Al) eutectic composite at 600&#xa0;°C is weaker than that at room temperature at the same solidification rate. The fracture mechanism of the Fe(Al, Ta)/Fe<sub>2</sub>Ta(Al) eutectic composite can be summarized as crack extension along the shear zone, crack passing through the Laves phase, crack extension along the phase interface and simultaneous extension of multiple cracks.</p>

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Tensile Property and Fracture Mechanism of Directionally Solidified Fe(Al, Ta)/Fe2Ta(Al) Eutectic Composites

  • Zhanpeng Liang,
  • Chunjuan Cui,
  • Wei Li,
  • Kai Zhang,
  • Haolin Li,
  • Zhiqi Zhao,
  • Haijun Su,
  • Yonghui Song

摘要

Fe-Al intermetallic compounds have received much attention as one of the high-temperature structural materials. In the present study, Fe(Al, Ta)/Fe2Ta(Al) eutectic composites were prepared using the electron beam floating zone melting (EBFZM) directional solidification technique. Room and high-temperature tensile properties of the Fe(Al, Ta)/Fe2Ta(Al) eutectic composites at different solidification rates were studied. Microstructure evolution and fracture mechanism during the fracture process were analyzed using in situ tensile tests. The results show that lamellar (rodlike) Fe2Ta(Al) Laves phase becomes finer and more uniform with the increase in the solidification rate. The tensile strength of the Fe(Al, Ta)/Fe2Ta(Al) eutectic composite increases with the increase in the solidification rate at the same tensile temperature. The tensile strength of the Fe(Al, Ta)/Fe2Ta(Al) eutectic composite at 600 °C is weaker than that at room temperature at the same solidification rate. The fracture mechanism of the Fe(Al, Ta)/Fe2Ta(Al) eutectic composite can be summarized as crack extension along the shear zone, crack passing through the Laves phase, crack extension along the phase interface and simultaneous extension of multiple cracks.