Evolution of the gamma/gamma' Interface Width in a Commercial Nickel Base Superalloy Studied by 3D Atom Probe (Preprint)

Abstract

The compositional width of the gamma/gamma-prime interface for primary and secondary gamma-prime precipitates in the commercial nickel base superalloy, Rene 88 DT, has been characterized at sub-nanometer resolution using local electrode atom probe (LEAP) tomography. On formation during continuous cooling, the primary gamma-prime precipitates exhibit a very sharp interface while the secondary gamma-prime precipitates exhibit a substantially more diffuse interface. Interestingly, on subsequent isothermal aging at 760 degrees C, the interface width increases for the primary gamma-prime precipitates while it decreases for the secondary gamma-prime precipitates, reaching a near equilibrium composition width for both types of interfaces after aging for 200 hours. These results imply the gamma/gamma-prime interface width is strongly dependent on temperature in these alloys.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2009
Accession Number
ADA502690

Entities

People

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

Organizations

  • University of North Texas

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Air Force Research Laboratories
  • Alloys
  • Chemical Compounds
  • Chemistry
  • Electrodes
  • Electron Microscopy
  • Energy
  • High Temperature
  • Materials
  • Materials Engineering
  • Materials Science
  • Microscopes
  • Personal Information Managers
  • Superalloys
  • Three Dimensional

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