Dislocation Velocity Measurements in High Purity Niobium.
Abstract
The velocity of screw dislocations on (211) planes, mixed dislocations on (101) planes, and mixed dislocations on (211) planes has been investigated microscopically in ultra-high purity niobium single crystals using Berg-Barrett X-ray topographs and chemical etching techniques. The Berg-Barrett X-ray topographic technique was found to be unsatisfactory for resolving individual dislocations or slip lines in the niobium used in this investigation. Chemical etching on the other hand produced satisfactory results and allowed the study of individual dislocations. An asymmetry of the velocity of screw dislocations on (211) planes was observed between a state of compression and a state of tension at room temperature. The screw and mixed dislocation velocities could be described by a power law dependence on stress. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1973
- Accession Number
- AD0769129
Entities
People
- Howard K. Birnbaum
- Robert P. Walson
Organizations
- University of Illinois Urbana–Champaign