Fundamental Investigations of Failure during Superplastic Forming Process

Abstract

The effects of strain rate on the stress-strain behavior of Ni- modified Ti-6Al-4V (Ti-6Al-4V-2Ni) at superplastic forming temperature (815 C), were investigated. The microstructural evolution during superplastic deformation (SPD), produced strain hardening at low strain-rates and strain softening at high strain rates. Maximum attainable superplastic ductility, observed at intermediate strain softening. Metallographic evidence is presented to show that the observed strain hardening is due to deformation-enhanced grain growth in the alpha and beta phases, while the strain softening can be attributed, primarily, to grain size refinement, due to dynamic recrystallization. Additional keywords: Titanium alloys.

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Document Details

Document Type
Technical Report
Publication Date
Mar 12, 1985
Accession Number
ADA154647

Entities

People

  • Arunabh Mukherjee
  • B. Hidalgo-prada

Organizations

  • University of California, Davis

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Diffusion
  • Ductility
  • Engineering
  • Grain Boundaries
  • Grain Growth
  • Grain Size
  • Hardening
  • Materials
  • Materials Science
  • Mechanical Properties
  • Microstructure
  • Softening
  • Strain Hardening
  • Strain Rate
  • Titanium Alloys

Fields of Study

  • Materials science

Readers

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