Microstructure and texture characterization of superplastic Al-Mg-Li alloy  

超塑Al-Mg-Li合金的显微组织与织构特性(英文)

作　　者：李红萍[1] 叶凌英[1,2] 张盼[1,2] 钟掘 黄明辉[3] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学教育部有色金属材料科学与工程教育部重点实验室,长沙410083 [3]中南大学机电工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第7期2079-2087,共9页中国有色金属学报（英文版）

基　　金：Project(51205419)supported by the National Natural Science Foundation of China

摘　　要：A novel thermomechanical processing was developed for producing fine grained Al-Mg-Li alloy sheets. The influences of static recrystallization annealing on the grain structure and superplastic behavior were investigated. The results show that the refined microstructure has a variation in the distribution of grain size, shape and texture across the normal direction of the sheet. The surface layer （SL） has fine, nearly equiaxed grains with a rotated cUbeND {001 }（310） orientation, whereas the center layer （CL） has coarse, elongated grains with a portion of a fiber orientation. Increasing static recrystallized temperature results in grain growth in the full thickness, decreasing of grain aspect ratio in the center layer, texture sharpening in the surface layer, but weakening in the center layer as well as decreasing of superplastic elongation. Increasing the annealing temperature also produces an sharpening of the rotated cube {001}（310） component and a decreasing of the a fiber texture in the full thickness of the sheet. The formation mechanisms of recrystallization texture at various temperatures and layers were discussed.采用一种新型形变热处理方法制备细晶Al-Mg-Li合金板材,研究静态再结晶退火对合金板材晶粒组织及超塑变形行为的影响。结果表明,晶粒尺寸、形状和织构的分布沿板材法向方向存在明显不同;表面层的晶粒组织细小、等轴,含有旋转cubeND{001}<310>取向;中心层具有粗大、长条状晶粒,含有α取向线的织构组分。随着再结晶温度的升高,整个板材的晶粒尺寸长大,中心层晶粒纵横比减小,表面层织构强化而中心层织构弱化,超塑性伸长率下降。升高再结晶温度导致整个板材内的旋转cubeND{001}<310>织构组分强化而α取向线的织构弱化。分析了不同温度下再结晶织构的形成机制。

关 键 词：5A90 Al-Li alloy thermomechanical processing TEXTURE SUPERPLASTICITY RECRYSTALLIZATION 

分 类 号：TG146.21[一般工业技术—材料科学与工程]