Hot Deformation of Ti-6Al-4V Single-Colony Samples (Preprint)

Abstract

The hot deformation response of lamellar colonies of Ti-6Al-4V was established via uniaxial compression testing. For this purpose, samples with a rectangular cross section were cut from single colonies grown using a float-zone technique and then tested at 815 degrees Celsius. Each sample was oriented for single slip along one of seven different slip system in the alpha phase. Measurements of the critical resolved shear stress (CRSS) at yielding and the subsequent flow behavior revealed a strong dependence of mechanical behavior on colony orientation/activated slip system. The anisotropy in the CRSS and the tendency for flow softening at large strains was rationalized on the basis of the burgers orientation relationship between the alpha (hcp) lamellae and the beta (bcc) matrix and hence the orientation of alpha slip directions relative to those in the beta phase.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2008
Accession Number
ADA490769

Entities

People

  • A. A. Salem
  • Sheldon Lee Semiatin

Organizations

  • Air Force Research Laboratory

Tags

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Anisotropy
  • Beta Testing
  • Compression
  • Diffraction
  • Electron Microscopy
  • High Temperature
  • Manufacturing
  • Materials
  • Mechanical Properties
  • Orientation (Direction)
  • Plastic Flow
  • Shear Stresses
  • Softening
  • Stresses
  • Titanium Alloys

Readers

  • Materials Science and Engineering.