Estimation of Grain Boundary Diffusivity in Near-Alpha Titanium Polycrystals (Preprint)

Abstract

The role of enhanced grain boundary diffusivity in high-temperature diffusion of interstitial elements through metals is widely recognized but poorly characterized in most materials. This paper summarizes an effort to estimate grain boundary diffusivity of oxygen in a near-alpha titanium alloy, Ti-6Al-2Sn-4Zr-2Mo-0.1Si, by explicitly incorporating microstructure obtained from electron backscatter diffraction into an analytical model. Attention is focused on near-surface diffusion behavior contributing to the rapid ingress of oxygen and possible crack initiation in high-temperature environments.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 2011
Accession Number
ADA553359

Entities

People

  • Adam L. Pilchak
  • Reji John
  • Robert A. Brockman
  • W. J. Porter Iii

Organizations

  • Air Force Research Laboratory

Tags

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Air Force Research Laboratories
  • Backscattering
  • Boundaries
  • Diffraction
  • Diffusion
  • Diffusivity
  • Electrons
  • Elements
  • Grain Boundaries
  • Materials
  • Metals
  • Military Research
  • Polycrystals
  • Titanium
  • Two Dimensional

Fields of Study

  • Materials science

Readers

  • Fluid Dynamics.
  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.

Technology Areas

  • Microelectronics