Fundamental Studies of Beta Phase Decomposition Modes in Titanium Alloys.

Abstract

An investigation of the interphase boundary structure of grain boundary alpha allotriomorphs in a Ti-7.15 W/O Cr alloy now in progress has established that complex, multiple sets of ledges are present at the interphase boundaries of allotriomorphs between not only the B grain with respect to which the allotriomorphs is Burgers oriented but also with respect to the adjacent B grain, with which the allotriomorph necessarily has a non-Burgers orientation relationship. Questions are arising, however, as to whether certain systems of ledges are (immobile) structural and growth ledges. Resolution of the misfit dislocations which must be present on the terraces of both types of ledges and distinguishing between misfit dislocations and ledges with short risers are important problems which have arisen in TEM studies of these interphase boundaries.

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Document Details

Document Type
Technical Report
Publication Date
Jan 31, 1988
Accession Number
ADA191495

Entities

People

  • A. M. Dalley
  • H. I. Aaronson
  • T. Furuhara
  • Y. Mou

Organizations

  • Carnegie Mellon University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Beta Testing
  • Boundaries
  • Chemistry
  • Crystal Lattices
  • Crystal Structure
  • Crystallography
  • Crystals
  • Decomposition
  • Dislocations
  • Grain Boundaries
  • Materials
  • Materials Science
  • Orientation (Direction)
  • Phase Transformations
  • Solid Solutions
  • Titanium Alloys

Readers

  • Powder metallurgy of Titanium alloys.
  • Theoretical Analysis.