Superplasticity - A Fundamental Investigation on Deformation Mechanism and Cavitation Phenomena.

Abstract

Al-Li alloy and the mechanically alloyed IN 91211 were investigated for superplasticity and enhanced plasticity. The deformation behavior of fine and coarse grains (coexisting in the same microstructure) was a function of strain rate. Both type of grains deformed in an intercrystalline manner in region II. In region III, only the fine grains deformed in this mode. The mechanically alloyed specimens revealed the high ductility of 500% elongation at the uncommonly high strain rate of 10 per sec. The stress exponent of strain rate for this alloy does not correlate with existing models for superplasticity. Additional mechanical and microstructural work underway are expected to shed more light on the micromechanism of deformation for this alloy. Keywords: Superplasticity, Aluminum Lithium alloys; Mechanically alloyed systems; Whisker reinforced matrix; Deformation mechanism; Silicon carbide whiskers.

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Document Details

Document Type
Technical Report
Publication Date
Feb 15, 1988
Accession Number
ADA191548

Entities

People

  • A. H. Chokshi
  • Arunabh Mukherjee
  • T. Bieler

Organizations

  • University of California, Davis

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Human Systems

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Aluminum Alloys
  • Chemistry
  • Creep
  • Ductility
  • Electron Microscopy
  • Engineering
  • Materials
  • Materials Science
  • Mechanical Properties
  • Mechanics
  • Plastic Properties
  • Silicon Carbide
  • Strain Rate
  • Stresses
  • Superplasticity

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.