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系统研究热加工过程对Al-Mg-Si-Cu合金组织、织构及力学性能的影响。通过工艺优化获得了力学性能各向异性很弱的合金板材。热轧和冷轧板材的显微组织均呈拉长态组织。热轧板表层的织构组分以H{001}<110>和E{111}<110>为主,而1/4层和中间层的织构以β取向线为主。与热轧板相比,一次冷轧板的β取向线密度增加而表层的H取向减弱。经中间退火后,形变织构基本消失,最终冷轧后的织构以β取向线为主。随着厚度的减小,织构梯度逐渐变弱。合金板材固溶处理后的再结晶织构组分仅含有cubeND{001}<310>织构。此外,分析了热加工过程、显微组织、织构以及力学性能之间的关系。
The effect of hot working process on the microstructure, texture and mechanical properties of Al-Mg-Si-Cu alloy was studied systematically. The alloy sheet with weak anisotropy of mechanical properties was obtained through process optimization. The microstructures of hot-rolled and cold-rolled sheet were elongated. The texture components of the hot-rolled sheet surface are mainly H {001} <110> and E {111} <110>, while the texture of the 1/4 layer and the middle layer are dominated by β-orientation lines. Compared with the hot-rolled sheet, the β-oriented linear density of the primary cold-rolled sheet increases while the H orientation of the surface layer decreases. After the intermediate annealing, the deformation texture basically disappeared, the final cold-rolled texture dominated by β-oriented lines. As the thickness decreases, the texture gradient becomes weaker. The recrystallized texture after solution treatment of the alloy sheet contains only the cubeND {001} <310> texture. In addition, the relationship between thermal processing, microstructure, texture and mechanical properties was analyzed.