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Microsegregation in and Phase Stability of As-Cast Ti-Zr-Hf-Ni-Pd-Pt High-Entropy Alloys

  • Symposium: High Entropy Alloys II
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Abstract

Microsegregation in as-cast Ti-Zr-Hf-Ni-Pd-Pt high-entropy alloys (HEAs) was examined by scanning electron microscopy and transmission electron microscopy. The structure of the microsegregated HEAs was composed of dendrite grains and grain boundaries. Since Hf, Zr, and Pt show both high melting temperatures and large negative mixing enthalpy, microsegregation on a micrometer scale occurred easily, similar to the spontaneous inoculation during solidification of copper-mold casts. In contrast, the grain boundaries were identified as being Ti- and Ni-enriched regions. Macroscopic X-ray data showed the combination of a distinct body-centered-cubic structure and broad halo peaks (amorphous structure). Microstructure analysis revealed that heteroamorphous and nanocrystalline regions are observed when the Ti group:Ni group molar ratio was 50/50. This unique microsegregated structure resulted in an ultimate compression strength of more than 2 GPa.

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Acknowledgements

This research was funded in part by a JSPS KAKENHI Grant-in-Aid for Scientific Research (C) Project No. 23560857.

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Authors and Affiliations

  1. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aobaku, Sendai, 980-8577, Japan

    Yoshihiko Yokoyama (Associate Professor), Shun Itoh (Technician), Yoshihiro Murakami (Technician) & Issei Narita (Technician)

  2. Department of Material Science and Engineering, University of Tennessee, Knoxville, TN, 37996-2200, USA

    Gongyao Wang (Assistant Professor) & Peter K. Liaw (Professor)

Authors
  1. Yoshihiko Yokoyama
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  2. Shun Itoh
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  3. Yoshihiro Murakami
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  4. Issei Narita
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  5. Gongyao Wang
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  6. Peter K. Liaw
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Correspondence to Yoshihiko Yokoyama.

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Manuscript submitted April 27, 2014.

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Yokoyama, Y., Itoh, S., Murakami, Y. et al. Microsegregation in and Phase Stability of As-Cast Ti-Zr-Hf-Ni-Pd-Pt High-Entropy Alloys. Metall Mater Trans A 46, 1474–1480 (2015). https://doi.org/10.1007/s11661-014-2622-5

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  • DOI: https://doi.org/10.1007/s11661-014-2622-5

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