Deformation and Fracture of Cadmium and Cadmium-Magnesium Alloys

Abstract

An attempt was made to determine the mechanisms of deformation and fracture in polycrystalline Cd, to correlate these mechanisms with pertinent aspects of single crystal behavior, and to determine whether the slip systems and mode of fracture of polycrystalline Cd could be altered by reduction of the axial ratio (1.886) by ALLOYING. Tests on polycrystalline Cd and Cd-Mg alloys indicated that the yield stress, flow stresses for arbitrary small strains, and the average coefficient of work hardening were relatively insensitive to temperature from room temperature to 4.2 K. The tensile strength of Cd was strongly temperature dependent but relatively independent of grain size between room temperature and -175C; below -175C it was dependent on grain size, but not on temperature. Cd had a ductile to quasi-brittle transition at about -155C which did not depend on grain size or purity. The minimum ductility, about 15 percent reduction in area, was reached near -196 and persisted at -269C.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1961
Accession Number
AD0257735

Entities

People

  • Norman S. Stoloff

Organizations

  • Columbia University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Chemical Analysis
  • Crystals
  • Engineering
  • Low Temperature
  • Magnesium Alloys
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Military Research
  • New York
  • Shear Stresses
  • Stress Strain Relations
  • Stresses
  • Tensile Strength
  • Transition Temperature
  • Yield Strength

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Materials Science (Mechanical Engineering).
  • Mathematics or Statistics