Low Temperature Superplasticity of Ti-6Al-4V Processed by Warm Multidirectional Forging (Preprint)

Abstract

Multidirectional forging has been developed to produce an ultrafine-grain (UFG) microstructure in the two-phase titanium alloy Ti-6Al-4V. A microstructure with a grain size of 135 nm was attained, enabling low-temperature superplasticity (LTSP) at 550 degrees Celsius. A total elongation of 1000% and strain-rate-sensitivity coefficient m=0.47 were obtained at the optimal strain rate of 2x10(^-4) s(^-1). Important features of the microstructure and superplastic behavior of the alloy are summarized in the present work. It is shown that microstructure evolution during low-temperature deformation plays a key role in superplastic flow behavior.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2012
Accession Number
ADA565955

Entities

People

  • E. A. Kudrjavtsev
  • G. A. Salishchev
  • S. V. Zherebtsov
  • Sheldon Lee Semiatin

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Alloys
  • Elongation
  • Grain Boundaries
  • Grain Growth
  • Grain Size
  • Heat Of Activation
  • Low Temperature
  • Materials
  • Mechanical Properties
  • Microstructure
  • Particles
  • Strain Rate
  • Superplasticity
  • Tensile Strength
  • Titanium Alloys

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Systems Analysis and Design