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Microstructure characterization of Alx CoCrCuFeNi high-entropy alloy system with multiprincipal elements

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Abstract

A new approach for the design of alloy systems with multiprincipal elements is presented in this research. The AlxCoCrCuFeNi alloys with different aluminum contents (i.e., x values in molar ratio, x=0 to 3.0) were synthesized using a well-developed arc-melting and casting method. These alloys possessed simple fcc/bcc structures, and their phase diagram was predicted by microstructure characterization and differential thermal analyses. With little aluminum addition, the alloys were composed of a simple fcc solid-solution structure. As the aluminum content reached x=0.8, a bcc structure appeared and constructed with mixed fcc and bcc eutectic phases. Spinodal decomposition occurred further on when the aluminum contents were higher than x=1.0, leading to the formation of modulated plate structures. A single ordered bcc structure was obtained for aluminum contents larger than x=2.8. The effects of high mixing entropy and sluggish cooperative diffusion enhance the formation of simple solid-solution phases and submicronic structures with nanoprecipitates in the alloys with multiprincipal elements rather than intermetallic compounds.

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Authors and Affiliations

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

    Chung-Jin Tong (Postgraduate Student), Yu-Liang Chen (Postdoctoral Candidate), Jien-Wei Yeh (Professor) & Su-Jien Lin (Professor)

  2. the Materials Science Center, National Tsing Hua University, Taiwan

    Swe-Kai Chen (Professor)

  3. the Materials Research Laboratory, Industrial Technology Research Institute, 310, Chutung, Taiwan

    Tao-Tsung Shun (Researcher)

  4. the Institute of Materials Science and Manufacturing, Chinese Culture University, 111, Taipei, Taiwan

    Chun-Huei Tsau (Associate Professor)

  5. the Department of Materials Engineering, National Chung Hsing University, 402, Taichung, Taiwan

    Shou-Yi Chang (Assistant Professor)

Authors
  1. Chung-Jin Tong
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  2. Yu-Liang Chen
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  3. Jien-Wei Yeh
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  4. Su-Jien Lin
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  7. Chun-Huei Tsau
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  8. Shou-Yi Chang
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Tong, CJ., Chen, YL., Yeh, JW. et al. Microstructure characterization of Alx CoCrCuFeNi high-entropy alloy system with multiprincipal elements. Metall Mater Trans A 36, 881–893 (2005). https://doi.org/10.1007/s11661-005-0283-0

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  • DOI: https://doi.org/10.1007/s11661-005-0283-0

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