The substructure of Cu3Au after tensile deformation and shock loading

摘要: Abstract A recent investigation by Beardmore et al. (Trans. Met. Soc. AIME230, 725 (1964)) showed a sharp rise in resistivity and stored energy the range 290–370 kb on shock-loading initially ordered Cu3,Au, but not with disordered alloy. Using samples from that investigation, optical transmission microscopy X-ray diffraction were employed to study substructure. Specimens also deformed ordinary tension at 77°K 298°K for comparison. There was no sudden increase dislocation densities or marked change arrangement shock-loaded specimens corresponding resistivity. The both initial states similar of order 1011 per cm2 after shock 370 kb, only about 30 cent greater than found tensile testing Cu3Au same strain. Antiphase domain boundaries created alloy {001} {111} planes, equal probability during loading, probabilities these an magnitude After antiphase primarily {111}, {001}. degree long-range 0.6 25 strain 0.95 deformation this Disordering due creation boundaries. Work hardening affected them. Local reduced loading specimens. local among atoms misplaced Twins identified shocked 290 higher. These finer more randomly dispersed state. No twins appreciable concentrations stacking faults interplanar spacing decreased boundaries, increased This indicates second-neighbor has sign as first system.