Deformation and Decomposition of Metastable B.C.C. Titanium Alloys.

Abstract

The effect of microstructure on mechanical properties of metastable beta titanium alloys was investigated, with emphasis on the influence of alpha-phase precipitation on tensile strength and ductility. A commercial alloy, Ti-3Al-8V-6Cr-4Mo-4Zr (Beta-C) has been aged to produce both Type 1 alpha (obeying the Burgers orientation relation) and 2 alpha (not obeying the Burgers relation) as hardening precipitates in the beta matrix. Although a direct comparison of Types 1 and 2 alpha could not be made, there did not seem to be any direct correlation between precipitate type and mechanical properties. Rather, it has been found that overaging to produce a coarse distribution of relatively large (>1000 A) non-coherent alpha precipitates provides the best combination of strength and ductility. The same strength can be achieved with much finer distribution of small (approximately 100-200 A) coherent alpha precipitates, but with much reduced ductility.

Document Details

Document Type
Technical Report
Publication Date
Feb 27, 1976
Accession Number
ADA022443

Entities

People

  • C. G. Rhodes
  • N. E. Paton

Tags

DTIC Thesaurus Topics

  • Alloys
  • Chemical Reactions
  • Decomposition
  • Ductility
  • Hardening
  • Mechanical Properties
  • Microstructure
  • Orientation (Direction)
  • Physical Properties
  • Precipitates
  • Precipitation
  • Tensile Strength
  • Titanium
  • Titanium Alloys

Fields of Study

  • Materials science

Readers

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