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Morphology Transition from Dendrites to Equiaxed Grains for AlCoCrFeNi High-Entropy Alloys by Copper Mold Casting and Bridgman Solidification

  • Symposium: Bulk Metallic Glasses VIII
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Abstract

The AlCoCrFeNi high-entropy alloys (HEAs) were prepared by the copper mold casting and Bridgman solidification. X-ray diffraction (XRD) results verify that the main phase was body-centered-cubic (bcc) solid solution by these two solidification processes, indicating its good phase stability. Interestingly, the metallographic photos show a morphology transition from dendrites to equiaxed grains after Bridgman solidification, which was considered to have a strong dependence on the parameter of the G/V (the temperature gradient to the growth rate ratio). Compared to the as-cast sample, the plasticity of alloys synthesized by Bridgman solidification was improved by a maximum of 35 pct.

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Acknowledgments

The authors are grateful to the program of the National Natural Science Foundation of China (NNSFC) (Contract No. 5097101) and the support from the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuang Island, China (Contract No. 201103).

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Authors and Affiliations

  1. State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing, 100083, P.R. China

    Y. Zhang (Professor) & S. G. Ma (Postdoctoral Candidate)

  2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, P.R. China

    J. W. Qiao (Associate Professor)

Authors
  1. Y. Zhang
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  2. S. G. Ma
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  3. J. W. Qiao
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Correspondence to Y. Zhang.

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Manuscript submitted April 28, 2011.

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Zhang, Y., Ma, S.G. & Qiao, J.W. Morphology Transition from Dendrites to Equiaxed Grains for AlCoCrFeNi High-Entropy Alloys by Copper Mold Casting and Bridgman Solidification. Metall Mater Trans A 43, 2625–2630 (2012). https://doi.org/10.1007/s11661-011-0981-8

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  • DOI: https://doi.org/10.1007/s11661-011-0981-8

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