Technical Papers and Notes - Institute of Metals Division - Rolling and Annealing Textures of Beryllium and Hafnium Sheet

QUESTIONS raised during earlier investigations of the preferred orientation in titanium1 and zirco-nium sheet led to the examination of the rolling and annealing textures of beryllium and hafnium sheet. Since the c/a ratios are 1.568 and 1.584, less than that of ideal close packing, 1.633, it would be expected that the preferred orientations would be similar to those exhibited by zirconium and titanium. This was found to be true. However, in several regards the orientations observed for beryllium differed from those reported by Smigels-kas and Barrett4 and so are given here. The okientations for hafnium are presented since only the cold-rolling texture has been reported in the unclassified literature. The pole figures were determined by transmission using an X-ray spectrogoniometer with copper Ka radiation and the automatic pole-figure recorder designed by Geisler described previously.6 The intensity units in the pole figures in this case are only arbitrary since calibration against a random sample of the same material was not considered necessary for the original purpose of the examination. The beryllium sheet, cold-rolled from 0.036 in. to 0.006 in., a reduction of about 84 pct, exhibited a split texture with the [1010] direction in the rolling direction as shown in Fig. 1. The same specimen annealed in vacuo for 1 hr at 1000°C showed no change in orientation. These textures