X-RAY DIFFRACTION STUDY OF DEFORMATION BY FILING IN BCC REFRACTORY METALS

Abstract

The bcc refractory metals, niobium, tantalum, vanadium, chromium and tungsten were cold worked by filing at room temperature. The broadening of the powder pattern peaks was studied by Fourier analyses of the line shapes. The effective particle sizes, De(hkl), and root mean squared (rms) strains were measured in different crystallographic directions. Anisotropic values of particle sizes observed in tantalum and niobium were an indication of faulting in these metals. The degree of anisotropy of particle sizes was much smaller in vanadium; tungsten and chromium showed isotropic particle sizes. The ratio of rms strains may be calculated from the directional variation of Young's modulus. The absolute magnitude of rms strains was also computed for isotropic bcc metals without faulting. The amount of faulting is observed to in crease with the degree of elastic anisotropy of the bcc metals of the group Vb. Metals of group VIb show no x-ray diffraction evidence of faulting.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1963
Accession Number
AD0403526

Entities

People

  • C. J. Wagner
  • E. N. Aqua

Organizations

  • Yale University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Cold Working
  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Diffraction
  • Distortion
  • Equations
  • Government Procurement
  • Measurement
  • Metals
  • Modulus Of Elasticity
  • Molybdenum
  • Particle Size
  • Refractory Metals
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.