3004铝合金再结晶织构及其显微组织

应用取向分布函数(ODF)和透射电镜(TEM)研究了3004铝合金再结晶织构及其显微组织·结果表明:在退火样品中存在较强的再结晶U({001}〈100〉)立方织构,且该织构随退火温度的升高而增强,在350℃和450℃时强度级别分别达8级和12级,再结晶R/S({124}〈211〉)织构、S({123}〈634〉)和C({112}〈111〉)织构组分强度较低·TEM形貌像表明:经250℃,120min退火后,样品中回复过程已基本完成;在300℃以上退火时,随着退火温度的升高,再结晶晶粒不断长大,第二相粒子继续析出,弥散地分布于晶粒内的亚晶界上,并被位错所包围,在再结晶过程中起到了促进形核的作用·

Recrystallization Textures and Microstructures of Aluminium Alloy 3004

The effect of temperature on recrystallization texture and microstructure of 3004 aluminium alloy has been investigated by means of orientation distribution function (ODF) and transmission electron microscope (TEM). The results showed that the orientation intensity of recrystallization cube texture |001| (100) is strong in annealed samples and become stronger along with increasing annealing temperature of which the intensity grades are f(g)∼8 and f(g)∼12 after annealing for 120 min at 350°C and 450°C respectively. But, the intensities of recrystallization texture R/S{124}<211>, S{123} <634> and C{112} <111> are weak; TEM images showed that the recovery process of the sample comes to the end after annealing at 250°C for 120 min. If annealed at over 300°C, the recrystallized grains grow increasingly and the 2nd-phase particles are precipitated further to disperse on the subboundaries in grains with dislocations surrounding them along with the increasing annealing temperature. Moreover, the 2nd-phase particles play the role of fostering the nucleation in recrystallization process.