EFFECT OF MICROSTRUCTURE ON THE STRENGTH, TOUGHNESS, AND STRESS- CORROSION CRACKING SUSCEPTIBILITY OF A METASTABLE BETA TITANIUM ALLOY (Ti-11. 5Mo-6Zr-4.5Sn)

Abstract

The paper describes the influence of microstructure on the mechanical properties of the alloy Ti-11.5Mo-6Zr-4.5Sn. The phase transformations are similar to those that occur in binary Ti-Mo alloys containing 10% to 12% Mo. Thus the beta-phase can be retained by quenching from above 1400F. The beta- phase deforms in a complex manner, including mechanical twinning, and is characterized by low strength, high ductility, and high toughness. The omega- phase, which also forms on quenching, is stable at temperatures up to 800F. Yield strengths of up to 220 ksi have been measured in (beta + omega) structures, the strength level being dependent on the size and volume fraction of the omega-phase. Unfortunately, the best combinations are susceptible to stress-corrosion cracking in aqueous solutions containing halide ions.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1970
Accession Number
AD0709049

Entities

People

  • John A. Feeney
  • Martin J. Blackburn

Organizations

  • Boeing Commercial Airplanes

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aqueous Solutions
  • Crystal Structure
  • Electron Microscopy
  • Hardening
  • Hardness
  • Heat Treatment
  • Materials
  • Materials Science
  • Mechanical Properties
  • Molybdenum
  • Phase Transformations
  • Precipitation
  • Solid Solutions
  • Stress Corrosion Cracking
  • Titanium
  • Transition Metals
  • Zirconium

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.