Accession Number : AD0776621

Title :   Stress-Velocity Relations for Dislocations in Niobium.

Descriptive Note : Technical rept.,

Corporate Author : ILLINOIS UNIV URBANA DEPT OF METALLURGY AND MINING ENGINEERING

Personal Author(s) : Walson,R. P. ; Birnbaum,H. K.

Report Date : FEB 1974

Pagination or Media Count : 20

Abstract : The stress-velocity relations for screw and mixed dislocations in high purity niobium were studied at 298K and 196K. Etch pitting methods were used to reveal the dislocation positions after stress pulses in tension and compression. Attention was particularly directed towards establishing any asymmetry in the motion of dislocations on the (112). No asymmetry was observed for either screw or mixed dislocations moving on the (112). The motion at 298K at low stresses was limited by extrinsic barriers while that at 196K and high stresses seemed limited by intrinsic dislocation drag. (Author)

Descriptors :   *Niobium, *Dislocations, Stresses, Crystal structure, Temperature

Subject Categories : Metallurgy and Metallography
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE