Effect of asymmetric rolling under high friction coefficient on recrystallization texture and plastic anisotropy of AA1050 alloy

高摩擦因数下非对称轧制对AA1050铝合金再结晶织构和塑性各向异性的影响（英文）

In asymmetric rolling(ASR) the circumferential velocities of the working rolls are different. This yields a complex deformation mode with shear, compression and rigid body rotation components. The main microstructural modification is on crystallographic texture, and, for aluminium alloys, this may improve the deformability after recrystallization. This work correlated the process variables, thickness reduction per pass(TRP) and velocity ratio between the upper and bottom rolls, with the texture development and the plastic properties after annealing. Finite element(FE) simulations were performed to quantify the influence of the strain components. Experimental data on texture, and plastic anisotropy were analyzed. In the sheet centre a crystallographic rotation of the compression components about the TD(transverse direction) axis was obtained, which yielded the development of {111}//ND(normal direction) texture components. On the surfaces the local variation of the velocity gradients caused an extra rotation component about ND. This yielded the increment of rotated cube components. After annealing the main texture components at the sheet centre were maintained and the texture intensity decreased. The planar anisotropy(△r) was reduced but the normal anisotropy and deep drawability obtained by the Erichsen test were similar for all conditions. The most favourable reduction of △r was obtained at a velocity ratio of 1.5 and TRP of 10%.

在非对称轧制中,由于轧辊的圆周速度不同,导致复杂的变形形式,包括剪切、压缩和刚体转动分量等。主要的显微结构改变是晶体织构的变化,对铝合金来说,这可以提高再结晶后的变形能力。本文将过程变量(每道次厚度减薄量(TRP)和速率比)与退火后的织构发展和塑性相联系,采用有限元模拟对应变分量的影响进行定量分析,并分析织构和塑性各向异性的实验数据。在轧板的中心,压缩分量绕横向发生晶体旋转,从而生成{111}//ND(法向)织构组分。在轧板表面,速度梯度的局部变化引起绕法向的旋转分量,从而使旋转立方织构增加。退火后,板材中心的主要织构组分得到保留,但织构强度降低。平面各向异性(Δr)降低,且在Erichsen试验中,在所有的条件下都得到相似的厚向异性和深冲性能。当速率比为1.5、TRP为10%时,Δr的减少量最佳。