Fundamental Investigations of Failure during Superplastic Forming Process

Abstract

Fine grained superplastic alph/beta Ti-6Al-4V alloy was deformed in the temperature range 750-925 C and at strain rates of 0.00001 to 0.0001/s. The results indicate that an increase in the deformation temperature or a decrease in the deformation rate is followed by an increase in the value of strain hardening index (SHI). In such a situation, the stress-strain rate relation can no longer be represented by the conventional power law formulation without evaluating the effect of strain. The common assumption that a large value of the (apparent) strain rate sensitivity parameter is associated with a large amount of superplastic ductility is not tenable under test conditions where strain hardening or strain softening effect is noticeable. Keywords: Titanium alloys; Mechanical behavior; Deformation mechanisms.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1984
Accession Number
ADA154516

Entities

People

  • Arunabh Mukherjee
  • B. Hidalgo-prada
  • G. Gurewitz
  • M. Meier

Organizations

  • University of California, Davis

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Alloys
  • Engineering
  • Grain Size
  • Hardening
  • Materials
  • Materials Science
  • Mechanical Engineering
  • Scientific Research
  • Sensitivity
  • Softening
  • Strain Hardening
  • Strain Rate
  • Stress Strain Relations
  • Titanium
  • Titanium Alloys

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Powder metallurgy of Titanium alloys.