IMPACT PROPERTIES OF Al-Cu ALLOY SUBJECTED TO EQUAL CHANNEL ANGULAR PRESSING

Impact properties of the casting Al-0.63%Cu and A1-3.9%Cu(mass fraction)alloys subjected to equal channel angular pressing(ECAP)were investigated.It is found that the impact properties of Al-0.63%Cu alloy were enhanced after ECAP,while for Al-3.9%Cu alloy,its impact toughness was not improved due to moreθ(Al_2Cu)phases,although the tensile strength increased because of grain refinement and dispersive precipitation of the second-phase.It is shown that the impact toughness is dependent on the static toughness of the Al-Cu alloys.