Abstract
The effects of O in solution on the mechanical properties of crystal-bar Hf were investigated. It was found that oxygen produces a significant increase in yield strength, a modest increase in strain hardening rate, and a drastic decrease in uniform elongation of hafnium at both 298 and 77/sup 0/K. The fracture mode of unalloyed hafnium is primarily dimpled rupture to temperatures as low as 4.2/sup 0/K, but the addition of as little as 0.485 at. percent oxygen causes a shift to cleavage at 77/sup 0/K. Cleavage also was observed at 298/sup 0/K with 1.45 at. percent oxygen. It is concluded that the suppression of cross slip by oxygen favors cleavage in hafnium. The cleavage plane was identified as (2130), but the possibility exists of more than one cleavage plane. (JRD)
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