1985 Volume 26 Issue 6 Pages 405-413
The effects of cooling rate after β annealing on cryogenic temperature mechanical properties were investigated for normal- and ELI-grade Ti–6Al–4V alloys. The β-annealing was very feasible method to improve cryogenic temperature fracture toughness. The slowly cooled β-annealing, in particular, brought about excellent fracture toughness and good fracture strain with a slight loss in strengths at 4 K. For the slowly cooled specimens, the single oriented α plates formed a packet smaller than prior-β grain. The high fracture toughness is attributed to the frequent arrest and deviation of the crack at the packet boundaries.
