Abstract
After 5∼30% roolling of 70/30 brass single crystals low temperature annealing at 255° was done. The methods of X-ray analysis were (1) Ordinary back reflection, (2) Ordinary transmission, (3) divergent ray back reflection and (4) divergent ray transmission methods. By annealing, the lattice constant at first decreases, then increases and finally reaches a certain limiting value. But in pure copper such complicated changes were not observed. Transmission Laue photographs show some changes after annealing of 10∼20 min, and after prolonged annealing the patterns are restored to the original ones. As these changes are not observed in pure copper, they must be attributed to a certain change in solid solution corresponding to anomalous hardening in α-brass. Kossel lines show some faults by 5% rolling, and slight changes have been observed after annealing of very short duration. By divergent ray back reflection method the same kind of changes in solid solution was observed upon annealing of 20∼40 min at 200°. Such changes were observed three days after cold twisting by measurement of electric resistance.
