弥散相对3003铝合金再结晶晶粒尺寸的影响

Effect of Dispersed Precipitates on Recrystallized Grain Size of 3003 Aluminum Alloy

针对3003铝合金冷轧板再结晶退火时出现的晶粒粗大问题,通过光学显微镜、扫描电镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)、透射电镜(TEM)等方法,研究均匀化退火和中间退火过程中形成的弥散相的种类、尺寸和分布情况对3003铝合金再结晶晶粒尺寸的影响机理。结果表明:3003铝合金铸轧板的再结晶开始温度约为540℃;均匀化退火过程中形成的预析出的粗大弥散相对再结晶有促进作用,而细小弥散相对再结晶有抑制作用;中间退火过程中析出的弥散相对再结晶的抑制作用微弱;500℃中间退火200s后,板材基体内没有弥散相析出,此时再结晶优于弥散相析出率先发生;500℃中间退火2h后,板材基体内会析出大量细小的AlMnSi相;3003铝合金的最佳均匀化退火温度区间为560~580℃。

Regarding the grain coarsening issue of 3003 aluminum alloy cold rolled plate during recrystallization annealing,optical microscopy,scanning electron microscopy（SEM）,energy spectrum analysis,X-ray diffraction and transmission electron microscopy were used to investigate the mechanism for the effect of dispersed precipitates,including their kinds,size and distribution on the recrystallization grain size,which were formed during homogenization annealing and intermediate annealing.The results indicate that the recrystallization starting temperature of 3003 aluminum alloy cast-rolling plate is 540℃;the coarse dispersed phases that formed during the homogenization annealing process facilitate the recrystallization,while the fine ones restrain the recrystallization;the fine dispersed phases that formed during the intermediate annealing have a weak effect on the recrystallization;there is no dispersed phases in the plate after intermediate annealing at 500℃for 200 s;at this time,recrystallization occurs prior to the precipitate of dispersed phase;there are many fine AlMnSi phase precipitates in the plate after intermediate annealing at 500℃for 2 h;the optimum homogenization annealing temperature range of 3003 aluminum alloy is between 560℃ and 580℃.