Evolution of the γ/γ′ interface width in a commercial nickel base superalloy studied by three-dimensional atom probe tomography

J. Y. Hwang, S. Nag, A. R.P. Singh, R. Srinivasan, J. Tiley, H. L. Fraser, R. Banerjee

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

The compositional width of the γ/γ′ interface in a commercial nickel base superalloy has been determined using three-dimensional atom probe tomography. Initially, on formation during continuous cooling, the primary γ′ precipitates exhibit a sharp interface while the secondary γ′ precipitates exhibit a substantially diffuse interface. On subsequent isothermal aging, the interface width increases for the primary γ′ precipitates while it decreases for the secondary γ′ precipitates, reaching a near-equilibrium width for both types of interfaces after prolonged aging.

Original languageEnglish
Pages (from-to)92-95
Number of pages4
JournalScripta Materialia
Volume61
Issue number1
DOIs
StatePublished - Jul 2009
Externally publishedYes

Funding

The authors would like to acknowledge the US Air Force Research Laboratory (AFRL ISES contract) and the US Air Force Office of Scientific Research (AFOSR Grant # FA9550-06-1-0193) for providing financial support for this study. In addition, the authors also gratefully acknowledge the Center for Advanced Research and Technology (CART) at the University of North Texas and the Center for the Accelerated Maturation of Materials (CAMM) at the Ohio State University for access to the experimental facilities used for this study.

Keywords

  • Interfaces
  • Nickel superalloy
  • Three-dimensional atom probe (3DAP)

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