Measurement of gamma prime Precipitates in a Nickel-Based Superalloy using Energy-Filtered Transmission Electron Microscopy Coupled With Automated Segmenting Techniques (Preprint)

Abstract

Precipitates of the ordered L1(sub 2) gamma prime phase (dispersed in the face-centered cubic or FCC gamma matrix) were imaged in Rene 88 DT, a commercial multicomponent Ni-based superalloy, using energy filtered transmission electron microscopy (EFTEM). Imaging was performed using the Cr, Co, Ni, Ti and Al elemental L-edges in the energy loss spectrum. Manual and automated segmentation procedures were utilized for identification of precipitate boundaries, measurement of precipitate sizes and overall area fractions. The automated region growing technique for precipitate identification in images was determined to accurately measure precipitate diameters. In addition, the region growing technique provided a repeatable method for optimizing segmentation techniques for varying EFTEM conditions.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2010
Accession Number
ADA519441

Entities

People

  • A. Shiveley
  • G. B. Viswanathan
  • H.L. Fraser
  • J. S. Tiley
  • Mark Tschopp
  • R. Banerjee
  • R. Srinivasan

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Boundaries
  • Computer Vision
  • Crystal Structure
  • Diameters
  • Electron Microscopy
  • Electrons
  • Engineering
  • Identification
  • Materials
  • Materials Science
  • Measurement
  • Microscopy
  • Physical Properties
  • Three Dimensional
  • Transmission Electron Microscopy

Fields of Study

  • Physics

Readers

  • Computer Vision.
  • Materials Science and Engineering.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Microelectronics