(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 西南铝业（集团）有限责任公司，重庆401326；
3. 湖南华菱线缆股份有限公司，湘潭 411104)
摘 要: 采用电子背散射衍射(EBSD)、透射电镜(TEM)和室温拉伸等方法研究了拉拔应变量对1350航空线材组织和性能的影响。结果表明：原始1350铝杆为等轴晶组织，大角度晶界占比较高；当应变量为0.61和1.28时，晶粒被拉长，形成大量胞块结构，大角度晶界占比显著降低；当应变量≥2.31时，拉长晶粒的晶界逐渐趋于与拉拔方向平行，胞块结构逐渐转变为层状结构，大角度晶界占比不断增大。不同变形阶段织构类型有所不同，当应变量≤1.28时，线材以〈100〉织构为主；当应变量≥2.31时，〈111〉织构强度和体积分数不断增加。线材强化机制以位错强化和晶界强化为主，随着应变量的增大两者对强度的贡献值不断增加，当应变量达到3.90后，形成的强〈111〉织构有较大的强化作用。
关键字: 航空线材；1350铝合金；微观组织；力学性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Southwest Aluminum (Group) Co., Ltd., Chongqing 401326, China;
3. Hunan Valin Cable Co., Ltd., Xiangtan 411104, China）
Abstract:The effect of drawing strain on the microstructure and properties of 1350 aerospace wire was investigated by electron backscattered diffraction (EBSD), transmission electron microscope (TEM) and ambient-temperature tensile test. The results show that the original 1350 aluminum rod has an equiaxed crystal structure, and the high-angle grain boundaries (HAGBs) account for a relatively high proportion. At the strains of 0.61 and 1.28, the grains are elongated to form a large number of cell block, and the proportion of the HAGBs is significantly reduced. At strain higher than 2.31, the grain boundaries of elongated grains are gradually parallel to the drawing direction, the cell block gradually transforms into a lamellar boundaries, and the proportion of HAGBs gradually increases. The texture types are different in different deformation stages. At strain less than 1.28, the wire is mainly made of 〈100〉 texture. At strain higher than 2.31, the intensity and volume fraction of 〈111〉texture increase continuously. The strengthening mechanism of wire is mainly dislocation strengthening and grain boundary strengthening. With the increase of the strain, the contribution of dislocation and grain boundary to the strength increases. When the strain reaches 3.90, the strong 〈111〉 texture has a relatively significant strengthening effect.
Key words: aviation wire; 1350 aluminum alloy; microstructure; mechanical property
