JOM

, Volume 68, Issue 3, pp 1037–1045 | Cite as

Effect of Withdrawal Rate and Gd on the Microstructures of Directionally Solidified NiAl-Cr(Mo) Hypereutectic Alloy

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Abstract

The microstructures of Ni-31Al-32Cr-6Mo-xGd hypereutectic alloy were investigated at the withdrawal rates of 10 μm/s, 30 μm/s, and 90 μm/s. For the Gd-free hypereutectic alloy, the Cr(Mo) primary dendrites appear at the beginning of solidification when the withdrawal rate is 10 μm/s. As the solidification proceeds, the Cr(Mo) primary dendrite is eliminated, and the fully eutectic structure can be obtained in the steady-state zone. With increasing the withdrawal rate, the Cr(Mo) primary dendrites decrease gradually, and vanish at 90 μm/s. In addition, at a moderate withdrawal rate (30 μm/s), an optimum addition of Gd content (0.1 wt.%) results in the refinement of the microstructure, including the refinement of the eutectic cells and the intercellular region. Meanwhile, the new white phase ((Al x Gd1−x )2O3) appears in the boundary of the eutectic cells when the Gd content is not less than 0.1 wt.%.

Notes

Acknowledgments

The work is supported by the National Natural Science Foundation of China (No. 51501147), the doctoral starting fund of Xi’an University of Technology (101-451115004), the fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP201509) and National Nature Science Foundation of China (No. 51074128).

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Copyright information

© The Minerals, Metals & Materials Society 2016

Authors and Affiliations

  • Lei Wang
    • 1
  • Jun Shen
    • 2
  • Yun-Peng Zhang
    • 1
  • Lan-Lan Guo
    • 1
  1. 1.School of Materials Science and EngineeringXi’an University of TechnologyXi’anChina
  2. 2.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anChina

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