7055-T7951铝合金热轧厚板微观组织及非均匀力学行为  

Microstructure and Tensile Property Inhomogeneity of Commercial 7055-T7951 Aluminum Alloy Thick Plate by Hot Rolling

作　　者：邵勇[1] 赵鹏飞 刘启航 郭平义[1] 石凤健[1] 杨宏宇[1] 严林 杨娜 Shao Yong;Zhao Pengfei;Liu Qihang;Guo Pingyi;Shi Fengjian;Yang Hongyu;Yan Lin;Yang Na(School of Material Science and Technology,Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《稀有金属材料与工程》2020年第12期4199-4206,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51701086)。

摘　　要：对工业级7055-T7951铝合金热轧厚板的合金成分、室温拉伸性能、显微组织以及织构特征等进行了实验分析,对该板材的微观组织状态、力学性能各向异性与织构特征关系进行了详细研究,结果表明:该板材镁元素含量总体处于下限水平,难溶的合金化合物很少,晶内的析出相主要为η′相和少量的η相,材料处于轻微过时效状态。板材存在明显的力学性能各向异性,沿轧制方向及横向的屈服及抗拉强度相近且明显优于与轧制方向呈45°方向上的指标。板材中心层各方位上的强度指标均优于表层对应方位上的指标,并且中心层的力学性能各向异性强于表层。该板材中心层有较为强烈的轧制类织构Brass和S,而表层则是以再结晶织构R为主。基于施密特定律研究了板材不同厚度层不同拉伸方向上平均屈服强度与施密特因子间的定性关系,探讨了织构特征对热轧厚板非均匀力学行为的影响规律。An experimental research of a commercial hot rolled 7055-T7951 aluminum alloy thick plate on composition,microstructure details,uniaxial tensile properties at room temperature,and texture feature was carried out.A quantitative analysis for texture feature as well as their influences on the mechanical anisotropy was investigated.The results show that there are few undissolved alloy compounds existing in the microstructure of this plate,possibly due to a low content level of magnesium.The precipitations in grains mainly consist ofη′andηphases,which indicates a slight overaged status for the material.The uniaxial tensile properties along the 0°and the 90°to the rolling direction of the plate are almost equal and both superior to those along the 45°to the rolling direction.In addition,the strength indicators in central layer of the plate are all superior to the corresponding parts in surface layer,and the tensile mechanical property anisotropy in central layer is more intense than that in surface layer.The texture near the center of the plate mainly consists of Brass and S rolling type.The R texture with recrystallization type is dominant near the surface.The mean yield strengths along different in-plane directions through the thickness were studied and compared based on the Schmid’s law.The relationship between the nonuniformity of mechanical behavior and texture characterization was discussed finally.

关 键 词：7055铝合金 T7951热处理 织构 热轧厚板 各向异性 

分 类 号：TG146.21[一般工业技术—材料科学与工程]