TTP Curves of AA1235 Alloy
The influences of annealing and pre-deformation on the precipitation behavior in AA1235 alloy sheet were investigated by XRD,TEM,optical microscopy and tensile test.The solid solubility of Fe and Si in the experiment alloy was analyzed by X-ray method,the TTP curve in the temperature range from 325 ℃ to 400 ℃ was obtained.The results show that with the precipitation of α-AlFeSi in the present temperature range,the solid solubility of Fe drops constantly during annealing.The TTP curves reveal that the pre-deformation can accelerate the precipitation.Annealed at 375 ℃ for 1h and 90% cold reduction is the optimum combination among the test conditions for achieving a favourable microstructure,such as α-AlFeSi precipitate and low Fe content in Al matrix.The optimum elongation can be obtained by annealing at 375 ℃ for 1 h with 90% cold reduction.