STRUCTURE AND MECHANICAL PROPERTIES OF NANOSTRUCTURED Al-0.3Cu ALLOY

摘要

An Al-0.3%Cu alloy has been produced using extremely high purity (99.9996%) Al and OFHC Cu.The alloy was cold rolled to 98% thickness reduction, forming a stable lamellar structure that has a lamellar boundary spacing of about 200nm and a tensile strength of 225MPa. During recovery annealing at temperatures up to 150°C, slight structural coarsening occurred without changing the lamellar structural morphology. At the same time the strength decreased, but no obvious enhanced tensile instability was observed as reported in the annealed nanostructured commercial purity Al1050 and Al1100. A good combination of yield strength as high as 100 MPa and elongation of larger than 10% could be obtained after annealing at medium temperatures where partial recrystallization took place.