Journal of Materials Science

, Volume 48, Issue 3, pp 1085–1089 | Cite as

Characterization of topologically close-packed phases in secondary reaction zone in a coated CMSX-4 single crystal Ni-based superalloy

  • X. P. Tan
  • H. U. Hong
  • B. G. Choi
  • I. S. Kim
  • C. Y. Jo
  • T. Jin
  • Z. Q. Hu


The topologically close-packed (TCP) precipitation in the secondary reaction zone (SRZ) in a thermal barrier coated alloy CMSX-4 has been investigated. The selected area electron diffraction (SAED) and high-angle annular dark field (HAADF) were used to analyze the TCP precipitates in the three different regions (including the SRZ, grain boundaries, and substrate) in this study. It was found that the interface between the SRZ and substrate was a high-angle grain boundary with a misorientation of ~51°. The TCP precipitates at the grain boundaries could inhibit the growth of SRZ. The SAED results indicate that most TCP precipitates were the faulted or twinned μ phase. In addition, the intergrowth of P phase with μ phase was found.


Select Area Electron Diffraction HVOF Bond Coat Discontinuous Precipitation HAADF Image 
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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • X. P. Tan
    • 1
    • 2
  • H. U. Hong
    • 3
  • B. G. Choi
    • 1
  • I. S. Kim
    • 1
  • C. Y. Jo
    • 1
  • T. Jin
    • 2
  • Z. Q. Hu
    • 2
  1. 1.High Temperature Materials Research GroupKorea Institute of Materials ScienceChangwonRepublic of Korea
  2. 2.Superalloy DivisionInstitute of Metal Research, Chinese Academy of SciencesShenyangChina
  3. 3.Departement of Materials Science and EngineeringChangwon National UniversityChangwonRepublic of Korea

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