Abstract
AbstractThe influence of low‐temperature cycling (300 ← 77 K) on the anisotropy of commerical purity beryllium structural state, obtained by uniaxial hot extrusion has been studied by means of X‐ray method. In initial samples the anisotropy of structural state is shown by the preferential orientation of grains relative to extraction axis.Two types of experiments were carried outTwo types of samples were investigated the samples cut out along and across the extrusion axis. It was shown that cycling in the samples oriented across the extrusion axis led to essential change in initial structural state due to intense twinning. Considerable changes in structures of the samples oriented along the extrusion axis were not observed. The effects are intensified by load application.Thermocycling leads to considerable decrease in grain size (form about 50 μm in initial state to about 30 μm after cycling) and decrease in structural state anisotropy.Nature of the phenomena found is discussed.
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