Beryllium Research and Development Program. Volume 6. Influence of the Distribution of Oxide and of the Total Impurity Level on Recrystallization and Grain Growth of Beryllium

Abstract : Conclusions are: (a) Increase of the impurity content in beryllium raises the recrystallization temperature and decreases the tendency for grain growth by restraining the movement of grain boundaries. (b) At high levels of deformation, the distribution of oxide does not seem to be fundamentally different for the material originating from the different types of powder. (c) The layers of oxide effectively restrain the motion of grain boundaries to the point of making grain growth negligible but do not always constitute an insurmountable barrier for these boundaries. (d) In all cases, the conditions of fabrication play a fundamental role in the subsequent behavior of the metal, especially with respect to the mechanical properties.