论文部分内容阅读
通过拉伸实验,并利用OM,SEM,TEM观察以及EBSD测试手段,研究了不同热加工工艺对Al-Mg-Si-Cu系合金板材力学性能和组织,包括织构的影响规律.结果表明,热加工工艺的变化对T4P预时效态合金的强度和应变硬化指数n基本无影响,但是对平均塑性应变比r,平面各向异性度Δr以及不同方向延伸率影响显著;热轧之后首先进行一定量的冷轧变形然后再进行退火处理获得的合金板材(工艺II)较热轧后直接进行退火处理(工艺I)获得的合金板材在固溶之后的成形性能要好,r可达0.6187,同时各向异性明显减小;虽然工艺I处理的合金板材固溶过程中PSN效应显著,但是工艺II固溶处理前的冷轧变形量和不同尺寸粒子分布情况设计合理,再结晶晶粒基本呈等轴状,且仅含有强度较低的CubeND,Cube和H织构.并根据热加工工艺对合金板材显微组织的影响规律,提出该系合金随热加工工艺进行的组织演化模型示意图.
The mechanical properties and microstructure, including texture, of Al-Mg-Si-Cu alloy sheets were studied by tensile test, OM, SEM, TEM observation and EBSD test. The results showed that the hot- The change of the hot working process has little effect on the strength and the strain hardening index n of the T4P pre-aged alloy, but has a significant effect on the average plastic strain ratio r, the plane anisotropy Δr and the elongation in different directions; after the hot rolling, The amount of cold-rolled deformation and then annealed the obtained alloy sheet (process II) than after hot-rolled annealing (Process I) obtained alloy sheet after solid solution forming performance is better, r up to 0.6187, while each While the anisotropy decreased obviously. Although the effect of PSN was significant during the solution treatment, the cold rolling deformation before the solution treatment and the distribution of particles with different sizes were well designed and the recrystallized grains were almost equiaxed And contains only low strength CubeND, Cube and H textures.According to the influence of hot working process on the microstructure of the alloy sheet, the microstructure evolution of the alloy with hot working process is proposed Type schematic.