(重庆大学材料科学与工程学院，重庆400044)
摘 要: 基于数据统计分析提出一种用于表面粗糙度仿真的有限元分析模型最佳尺寸的确定方法，采用最优模型分析多种应变路径下铝合金Al6061材料的晶粒尺寸和织构类型对表面粗糙度演变的影响。结果表明：不同的应变路径下，塑性变形后的表面粗糙度随着晶粒尺寸的增加而增大；具有较小泰勒因子的织构，在变形过程中自身变形协调性较好，可以获得较好的表面质量；而在相同的变形条件下，具有相同泰勒因子、不同剪切趋势的材料在塑性变形后会呈现出不同的表面形貌，织构之间的剪切趋势差异越大，变形后的表面就越粗糙。
关键字: Al6061板；表面粗糙度；晶体塑性；有限元模型；应变路径；晶粒尺寸；织构种类
（College of Material Science and Engineering, Chongqing University, Chongqing 400044, China）
Abstract:The optimum crystal model size established method for surface roughness simulation was presented based on data statistic analysis. The influences of grain size and textures ofAl6061 alloy on surface roughness evolution were discussed under different strain routes. The results indicate that the surface roughness after plastic deformation increases with the increase of the grain size under different strain routes. The textures with small Taylor factor have better deformation coordination, which will be beneficial to reduce the surface roughness. Under the same deformation condition, the models with the same Taylor factor and different the shear tendencies present different surface morphologies. And the larger shear tendency difference is, the worse the surface obtained after plastic deformation will be.
Key words: Al6061 sheet; surface roughness; crystal plastic; finite element model; strain route; grain size; texture type
