汽车用6111铝合金板材力学性能和织构研究  

Study on mechanical properties and texture of 6111 aluminum alloy sheet in automotive industry

作　　者：曹零勇[1] 郭明星[1] 崔华[2] 蔡元华[1] 汪小峰[1] 庄林忠[1] 张济山[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2013年第7期118-123,共6页Transactions of Materials and Heat Treatment

基　　金：北京市自然科学基金(2112030);新金属材料国家重点实验室自主课题(2012Z-07)

摘　　要：对6111铝合金板材T4P态(预时效后室温放置)和烤漆态(185℃×20 min)沿不同方向的力学性能和织构差异进行研究,结果表明:合金两个状态沿不同方向的力学性能存在明显差异,屈服强度沿轧向最高,分别为171 MPa和261 MPa,烘烤增量达90 MPa,而伸长率却在与轧向呈45°方向最高;T4P态r和n值均沿轧向最高,而与轧向呈45°方向最低;合金T4P态已完全再结晶,表层晶粒尺寸小于中间层,纵截面再结晶晶粒长宽比高于横截面的;合金板材沿厚度方向存在明显的织构梯度,表层以{001}<100>Cube织构和β取向线上的{114}<131>织构为主,而中间层除{001}<100>Cube织构外,还存在旋转立方织构{001}<310>;据此建立了6111铝合金板材不同状态力学性能和织构之间的定量关系。Mechanical properties and textures in different directions of 6111 aluminum alloy sheet under T4P and paint-baked（185 ℃×20 min）states were investigated.The results show that the mechanical properties of the alloy sheet under the two states are clearly different in the different directions with the highest yield strength in the rolling direction,which can reach 171 MPa and 261 MPa,respectively,with the increment of 90 MPa after bake-hardening,but the highest elongation appears in the 45° to rolling direction,the highest r and n values observed in the rolling direction while the lowest in the 45° to rolling direction.The microstructure of the T4P alloy have been completely recrystallized with smaller grains in the surface layer than those in the center part,and the length-width ratio of recrystallization grains in the longitudinal section is higher than that in the transverse section.The gradient distribution of the textures of the alloy is obvious along the sheet thickness that {001} 100 cube and {114} 131 texture in the β orientation in the sheet surface,and {001} 100 cube and {114} 131 rotated cube textures in the sheet center,the relationship befween mechanical properties and texture in the 6111 aluminium alloy sheet is established.

关 键 词：汽车材料 6xxx系铝合金 各向异性 织构 成形性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]