Nanoscale Characterization of Elemental Partitioning Between Gamma and Gamma Prime Phases in Rene 88DT Nickel Base Superalloy (Preprint)

Abstract

The chemical partitioning of alloying elements between the disordered y and ordered y' phases in the nickel base superalloy Rene 88DT, has been characterized in detail using three dimensional atom probe tomography (3DAP) coupled with energy-filtered transmission electron microscopy studies. After a homogenization treatment followed by a water quench, it is observed that the morphology of the y' precipitates, reduces with increasing aging time, while the compositional gradient across the y/y' interface decrease. The process of growth of y' precipitates seems to occur through coalescence of adjacent y' precipitates, facilitated through the formation of "necks" between adjacent precipitates. These necks are observed to have intermediate elemental concentration values, between the matrix and the y' precipitate compositions.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2008
Accession Number
ADA501127

Entities

People

  • G.b. Viswanathan
  • H.L. Fraser
  • J.y. Hwang
  • Jaimie S. Tiley
  • R. Banerjee
  • R. Srinivasan

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Air Force Research Laboratories
  • Alloys
  • Chemical Compounds
  • Chemistry
  • Coalescence
  • Electron Microscopy
  • Jet Engines
  • Materials
  • Materials Science
  • Microscopes
  • Microscopy
  • Superalloys
  • Three Dimensional
  • Tomography
  • Turbines

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics