THE MICROPLASTIC BEHAVIOR OF POLYCRYSTALLINE NICKEL,
Abstract
A study was undertaken to determine the deformation behavior of polycrystalline nickel of grain sizes from 0.018 to 0.44 mm in the microstrain region. Deformation was observed to begin at stresses of about 200 psi or 0.1 of the critical resolved shear stress for single crystals. Deformation proceeded in annealed samples by three well developed stages, the nature of each of which was influenced by prior thermomechanical treatments. The micro-flow stress in the third stage obeyed a Petch type of grain size dependence; no parabolic hardening behavior was observed. A micro-Bauschinger effect was observed that may be related to the lattice resistance to free dislocation motion. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 06, 1964
- Accession Number
- AD0427348
Entities
People
- J. E. White
- R. D. Carnahan
Organizations
- The Aerospace Corporation