Microstructure Evolution and Mechanical Behavior of Ultrafine Ti-6Al-4V During Low Temperature Superplastic Deformation (Postprint)

Abstract

The influence of microstructure evolution on the low-temperature superplasticity of ultrafine Ti6Al4V was established. For this purpose, the static and dynamic coarsening response and plastic-flow behavior of the alloy with a mean size of (sub) grains and particles of 0.10.4 m were determined via a series of tension tests at temperatures between 450 and 700 C. Both static and dynamic coarsening exhibited diffusion-controlled (r3-vs-time) kinetics. However, dynamic coarsening was approximately two orders of magnitude faster than the corresponding static behaviors due to enhanced diffusion through the deformed matrix. A total elongation of 1000 and strain-rate-sensitivity exponent m = 0.48 were obtained at 550 C and 2 104 s1. Very limited cavitation was observed in the specimens after superplastic deformation under optimal conditions.

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Document Details

Document Type
Technical Report
Publication Date
Sep 13, 2016
Accession Number
AD1036003

Entities

People

  • B. B. Straumal
  • E. A. Kudryavtsev
  • G. A. Salishchev
  • S. V. Zherebtsov
  • Sheldon Lee Semiatin

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Boundaries
  • Diffusion
  • Grain Size
  • Heat Treatment
  • Low Temperature
  • Materials
  • Mechanical Properties
  • Microstructure
  • Particle Size
  • Particles
  • Plastic Flow
  • Strain Rate
  • Stress Concentration
  • Superplasticity
  • Titanium Alloys

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.