摘要
Ultrafine grain pure aluminum was produced by equal channel angular pressing and cold rolling, the deformed aluminum was annealed at 200 ℃ for 1 h. The tensile curves of deformed and annealed aluminum show that yield strength of deformed aluminum increases by 100%-300% and its elongation decreases by about 20%. After low temperature annealing, strength of annealed aluminum increases by 20% and elongation decreases by over 50%, the recovery of dislocations may be the main cause of annealing strengthening. In addition, there is an abrupt stress drop in the tensile curves of annealed aluminum and the formation of shear band is responsible for it.
Ultrafine grain pure aluminum was produced by equal channel angular pressing and cold rolling,the deformed aluminum was annealed at 200 °C for 1 h.The tensile curves of deformed and annealed aluminum show that yield strength of deformed aluminum increases by 100%-300% and its elongation decreases by about 20%.After low temperature annealing,strength of annealed aluminum increases by 20% and elongation decreases by over 50%,the recovery of dislocations may be the main cause of annealing strengthening.In addition,there is an abrupt stress drop in the tensile curves of annealed aluminum and the formation of shear band is responsible for it.
基金
Project(gjd08011) supported by Shanghai Municipal Education Commission,China
Project (J51402) supported by Shanghai Leading Academic Discipline,China
