Characterization of mechanical and corrosion properties of cryorolled Al 1100 alloy:Effect of annealing and solution treatment

退火和固溶处理对深冷轧1100铝合金力学性能和腐蚀性能的影响

Effect of annealing and solution treatment prior to cryorolling on the formation of initial structure influencing microstructure formation from nano to micron scale and resultant mechanical and corrosion properties in Al 1100 alloy has been studied in detail.Before subjecting to 50%cryorolling,samples were pre-annealed at 250℃ for 2 h and pre-solution treated at 540℃ for 1 h.X-ray diffraction and HRTEM techniques were used to understand the crystallite size,lattice strain and dislocation configuration in the processed alloy.The results indicate that the pre-annealed sample has the highest grain aspect ratio(4.43),the smallest crystallite size(37.53 nm),the highest lattice strain(9.12×10^(−3))and the highest dislocation density(45.16×10^(13) m^(−2))among the tested sample.The pre-annealed sample shows a significant improvement of 43.44%,24.64%and 20.33%in hardness,ultimate tensile strength and yield strength.Both pre-annealed and pre-solution treated samples show improved corrosion resistance when compared to cryorolled samples without any pre-treatment,with the pre-annealed sample showing the best corrosion resistance.

详细研究冷轧前退火和固溶处理对1100铝合金初始组织的形成、纳米至微米级组织的形成以及力学性能和腐蚀性能的影响。在50%深冷轧前,先对样品在250℃下预退火2 h,或在540℃下预固溶处理1 h。利用X射线衍射和高分辨率透射电子显微镜技术研究加工后合金的晶粒尺寸、晶格应变和位错组态。结果表明,与预固溶处理的样品相比,预退火处理的样品具有最大的晶粒长宽比(4.43)、最小的晶粒尺寸(37.53 nm)、最高的晶格应变(9.12×10^(−3))和最高的位错密度(45.16×10^(13)m^(−2))。预退火样品的硬度、极限抗拉强度和屈服强度分别提高43.44%、24.64%和20.33%。与未经预处理的深冷轧样品相比,预退火和预固溶处理样品的耐腐蚀性更好,其中预退火样品的耐腐蚀性最好。