LOW-TEMPERATURE BRITTLENESS OF REFRACTORY METALS

Abstract

Effort was directed towards (1) the production of high-purity material, (2) determination of the modes of deformation and the mechanical properties of W single crystals as a function of temperature, and (3) the behavior of individual dislocations. The W was produced in the form of single crystals and purified by the electron bombardment floating zone refining technique developed by Calverly, Davis, and Lever (J. Sci. Instr. 34:142, 1957). The modes of deformation and mechanical properties were determined at 500 to 20 K with standard techniques and the single crystals. The behavior of individual dislocations was observed with the aid of the etchpitting technique of Wolff (Acta Metallurgica 6:559, 1958) and the technique of Stein and Low (J. Appl. Phys. 31:362, 1960) ctfor measuring dislocation velocities. Appended are (1) a study of the recrystallization characteristics of cold-worked single crystals, and (2) a brief report on crystallography of twins in Mo-35 at.-% Re single crystal.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1962
Accession Number
AD0274151

Entities

People

  • H. W. Schadler
  • J. R. Low Jr.

Organizations

  • General Electric

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Crystal Lattices
  • Crystal Structure
  • Crystallography
  • Crystals
  • Electropolishing
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Refractory Metals
  • Stress Strain Relations
  • Stresses
  • Temperature Gradients
  • Transition Temperature
  • Transitions
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Calculus or Mathematical Analysis
  • Materials Science and Engineering.
  • Metallurgy

Technology Areas

  • Microelectronics