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Metallurgical and Materials Transactions A

, Volume 36, Issue 4, pp 881–893 | Cite as

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

  • Chung-Jin Tong
  • Yu-Liang Chen
  • Jien-Wei Yeh
  • Su-Jien Lin
  • Swe-Kai Chen
  • Tao-Tsung Shun
  • Chun-Huei Tsau
  • Shou-Yi Chang
Article

Abstract

A new approach for the design of alloy systems with multiprincipal elements is presented in this research. The Al x CoCrCuFeNi 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.

Keywords

Material Transaction Aluminum Content Select Area Diffraction Select Area Diffraction Pattern Spinodal Decomposition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2005

Authors and Affiliations

  • Chung-Jin Tong
    • 1
  • Yu-Liang Chen
    • 1
  • Jien-Wei Yeh
    • 1
  • Su-Jien Lin
    • 1
  • Swe-Kai Chen
    • 2
  • Tao-Tsung Shun
    • 3
  • Chun-Huei Tsau
    • 4
  • Shou-Yi Chang
    • 5
  1. 1.the Department of Materials Science and EngineeringNational Tsing Hua UniversityHsinchuTaiwan
  2. 2.the Materials Science CenterNational Tsing Hua UniversityTaiwan
  3. 3.the Materials Research LaboratoryIndustrial Technology Research InstituteChutungTaiwan
  4. 4.the Institute of Materials Science and ManufacturingChinese Culture UniversityTaipeiTaiwan
  5. 5.the Department of Materials EngineeringNational Chung Hsing UniversityTaichungTaiwan

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