Mechanical Behavior of High-Strength Beta-Titanium Alloys.

Abstract

Thermomechanical treatments of Beta-III (11.5 Mo-6 Zr-4.5 Sn-Ti) and 18 Mo-Ti were performed in order to study microstructure-mechanical property relationships. Transmission electron microscopy was employed to delineate the effects that prior cold work and multiple aging steps produce in microstructure. The optimum combination of strength (230 ksi) and good ductility/toughness is obtained by cold work of the Beta-phase followed by preaging in the omega + Beta region and final aging in the alpha + Beta region to produce an extremely fine distribution of alpha-particles in the Beta-matrix. Results of an internal friction study on a series of Beta-Ti alloys containing various amounts of Mo and V with and without plastic deformation are also presented in order to describe the fundamental nature of the Beta-omega transformation. These results indicate the transformation to be of the 'atom shuttle' or displasive type. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1971
Accession Number
AD0729145

Entities

People

  • A. W. Sommer
  • Kanji Ono
  • L. A. Rosales
  • S. Motokura

Tags

DTIC Thesaurus Topics

  • Alloys
  • Alpha Particles
  • Beta Testing
  • Ductility
  • Electron Microscopy
  • Friction
  • Internal Friction
  • Mechanical Properties
  • Microscopy
  • Microstructure
  • Plastic Deformation
  • Titanium
  • Titanium Alloys
  • Toughness
  • Transmission Electron Microscopy

Readers

  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics