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On the Solidification and Phase Stability of a Co-Cr-Fe-Ni-Ti High-Entropy Alloy

  • Symposium: High Entropy Alloys
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Abstract

In the present study, a Co1.5CrFeNi1.5Ti0.5 high-entropy alloy has been investigated for its high-temperature microstructural stability. This material is shown to possess mainly a face-centered cubic (FCC) structure; the η phase is present at the interdendritic region in the as-cast condition, and it is stable between 1073 K and 1273 K (800 °C and 1000 °C); γ′ particles are found throughout the microstructures below 1073 K (800 °C). Segregation analysis has been conducted on a single crystal sample fabricated by a directional solidification process with a single crystal seed. Results show that Co, Cr, and Fe partition toward the dendritic region, while Ni and Ti partition toward the interdendritic areas. Scheil analysis indicates that the solid–liquid partitioning ratio of each element is very similar to those in typical single crystal superalloys.

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Acknowledgments

The author gratefully acknowledges the financial support of the National Science Council of Taiwan under Grants 101-2218-E-007-004, 100-2632-E-214-073-MY3, and 102-2221-E-007-059.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 300, Taiwan, R.O.C.

    An-Chou Yeh (Assistant Professor), Yao-Jen Chang (Ph.D Candidate), Che-Wei Tsai (Doctor), Yen-Chun Wang (Master) & Jien-Wei Yeh (Professor)

  2. Department of Mechanical and Automation Engineering, I-Shou University, Dashu, Kaohsiung, 84001, Taiwan, R.O.C.

    Chen-Ming Kuo (Professor)

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  1. An-Chou Yeh
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  2. Yao-Jen Chang
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  4. Yen-Chun Wang
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  5. Jien-Wei Yeh
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Correspondence to An-Chou Yeh.

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Manuscript submitted April 30, 2013.

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Yeh, AC., Chang, YJ., Tsai, CW. et al. On the Solidification and Phase Stability of a Co-Cr-Fe-Ni-Ti High-Entropy Alloy. Metall Mater Trans A 45, 184–190 (2014). https://doi.org/10.1007/s11661-013-2097-9

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  • DOI: https://doi.org/10.1007/s11661-013-2097-9

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