中间退火处理对AlMgSiCu铝合金冷轧板组织性能的影响  

Influence of intermediate annealing on microstructure and properties of cold rolled AlMgSiCu aluminum alloy sheet

作　　者：宫浩[1] 孔德斌[1] 郭立娜[1] 韩洪文[1] 宫晶晶[1] 房洪杰[1] Gong Hao;Kong Debin;Guo Lina;Han Hongwen;Gong Jingjing;Fang Hongjie(College of Engineering,Yantai Nanshan University,Yantai Shandong 265713,China)

机构地区：[1]烟台南山学院工学院,山东烟台265713

出　　处：《金属热处理》2021年第9期129-132,共4页Heat Treatment of Metals

摘　　要：利用拉伸试验机、TEM透射电镜和XRD,研究了中间退火处理对6000系AlMgSiCu铝合金冷轧板力学性能和组织织构演变的影响。结果表明:经300℃×2 h和400℃×2 h的中间退火处理后,AlMgSiCu合金强度指标并未发生明显的改变。加工硬化指数(n)值和塑性应变比(r)值随中间退火温度的提高,呈现增加的趋势。经400℃×2 h中间退火处理后,n值达到了0.286,r值达到了0.623,大部分晶粒已演变为等轴晶粒。试样基体内主要存在3种形式的第二相,尺寸在1μm左右的AlFeMnSi颗粒相,宽度在0.1μm左右的长棒状AlMgSiCu相和球状Si颗粒相。长棒状AlMgSiCu相随着中间退火温度的升高先析出后溶解。无中间退火的板材,Brass{011}<211>织构和S{123}<634>织构的体积分数最高,分别达到了13.9%和25.7%。经400℃×2 h中间退火的试样,以Cube{001}<100>织构为主,体积分数达到了24.3%,r-Cube织构达到了10.5%。Influence of intermediate annealing on microstructure and mechanical properties of the cold rolled Al MgSiCu aluminum alloy sheet was studied by using tensile testing machine,TEM and XRD.The results indicate that the strength has no obvious change after 300℃×2 h and 400℃×2 h intermediate annealing.The n and r values increase with intermediate annealing temperature increasing,which arrives respectively 0.286 and 0.623 after annealing at 400℃ for 2 h,and recrystallization occurs and most grains are equiaxed after 400℃×2 h intermediate annealing.Three types of secondary phases are in the matrix:AlFeMnSi particles of about 1μm in size,long rod AlMgSiCu phases of 0.1μm in width and globular Si particles.The long rod AlMgSiCu phase first precipitates and then re-dissolves with the increase of intermediate temperature.The volume fraction of Brass{011}<211> texture and S{123}<634> texture of the alloy without intermediate annealing is the highest,and reaches 13.9% and 25.7%,respectively.After 400℃×2 h intermediate annealing,the texture in the specimen is mainly 24.3% of Cube {001}<100> type,with 10.5% of r-Cube type(both in volume fraction).

关 键 词：AlMgSiCu铝合金 微观组织 性能 中间退火 织构 

分 类 号：TG156[金属学及工艺—热处理]