Influence of Temperature on High Cycle Fatigue Properties of Ti-6Al-2Sn- 4Zr-6Mo

Abstract

High cycle fatigue data of unnotched Ti-6Al-2Sn-4Zr-6Mo revealed no change in fatigue strength at 900 F compared to room temperature, 400 F, and 700 F. At 1000 F, the decrease in fatigue strength from that at 900 F and below becomes noticeable. At 1200 F the decrease is significant. The fatigue strength- life curve of specimens coated with electroless nickel and diffusion bonded, which were tested at 1000 F, falls midway between results of uncoated specimens tested at 1000 F and 1200 F. Microstructural changes occurring with time, at temperature, indicate a refinement of structure. Fractography reveals three distinct areas: an initial radial area which is a mixed mode of quasi-cleavage and intergranular fracture; followed by a radial fibrous zone, the result of dimpled fracture; and finally a shear lip which occurs by shear fracture.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1978
Accession Number
ADA061446

Entities

People

  • Frank S. Hodi

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Alloys
  • Chemistry
  • Failure Mode And Effect Analysis
  • Gas Turbines
  • Heat Resistant Alloys
  • Heat Resistant Materials
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Science
  • Mechanics
  • Metals
  • Military Research
  • Titanium Alloys
  • Turbines
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.
  • Surface Engineering/Surface Coating Technology.