“…In these alloys intergranular fracture is promoted by a high elastic anisotropy, and is also influenced by the various (brittle or ductile) second phases that can line grain boundaries. [164][165][166][167][168][169] Influence of strain rate and grain size As for pure copper 6,9,90,[125][126][127][128][129] and except for very rapid (impact) deformation, as the strain rate increases the trough narrows and becomes more shallow for brasses, 68,125,126,128,137,143,150,[170][171][172][173] bronzes, 174,175 cupronickel alloys 9,[176][177][178] and dispersion hardened copper. 6,153,160,179,180 For two (70-30 and 80-20) a-brasses, T E was found to be strain-rate dependent, but not T R .…”