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The Effects Of Strain Rate And Hydrogen Content on the Low Temperature Deformation Behavior Of Columbium

Report Number: WADD TR 61-44
Author(s): B.A. Wilcox, A.W. Brisbane, R.F. Klinger
Corporate Author: Metals and Ceramics Laboratory
Laboratory: Metals and Ceramics Laboratory
Date of Publication: 1961-05
Pages: 32
Contract: Laboratory Research - No Contract
Project: 7351 - Metallic Materials
Task: 73521
AD Number: AD0264858

The strain rate and temperature dependencies of the low temperature deformation behavior of fine grained arc-melted Nb (1 ppm H) were evaluated for tensile strain rates of 0.005, 0.10 and 6.0 sq. in./min. The effect of H content (1, 9, and 30 ppm H) on the mechanical behavior was also investigated in the temperature range 25 to -195 C, using a tensile strain rate of 0.005/min. The existence of an H-dislocation interaction in Nb was confirmed by: (1) calculation of an apparent activation energy for the early stages of low temperature deformation; (2) observation of an H-induced strain aging peak at -50 C, for Nb containing 30 ppm H; and (3) observation of a serrated stress-strain curve at 25 C in coarse grained Nb containing 89 ppm H.

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