Deformation systems of α-zirconium

Abstract

The deformation systems of α-zirconium iodide have been studied in coarse-grained polycrystalline specimens deformed by upsetting. The orientation of the grains was determined from Laue patterns obtained in a special back-reflection camera using a small-diameter beam. The indices of the deformation systems were determined by the two-surface method and by the pole locus method.

It was found that α-zirconium is deformed by slip along the$(10\bar 10)$ plane in the$[1\bar 210]$ direction and along the$(10\bar 11)$ plane. A number of twinning systems have been discovered In α-zirconium: a) K₁ $(10\bar 12)$, η1$[\bar 1011]$, K₁ $(10\overline {12} )$, η₂ $[10\bar 11]$ and s=0.173; b) K₁ $(11\bar 21)$, η₂ [1126], K₂ (0001), η₂ [1120] and s=0.629; c) K₁ (1122), η₁ [1123] and in one case, d) K₁ $(11\bar 23)$, η₁ $[\overline {11} 22]$.