合金元素及制备工艺对1XXX系铝合金组织及性能的影响

Effect of Alloying Elements and Processing Parameters on Microstructure and Properties of 1XXX Aluminium Alloys

摘要:

通过直接激冷铸造（DCC）与双辊铸轧（TRC）方法生产了具有不同Fe、Si、Cu和Mn含量的1XXX系铝合金坯料，随后通过均匀化、热轧、冷轧和退火等加工工艺制备了厚度为13 μm的铝箔。结果显示，铸造工艺对铝箔强度影响较小，双辊铸轧引入的较细第二相有利于铝箔塑性。在580 ℃以上进行均匀化处理可细化直接激冷铸造铸锭的粗大晶界金属间化合物，并使其在后续热轧中破碎为小颗粒。因Cu溶质原子可提高加工硬化速率，添加Cu元素的效果优于添加Fe、Si和Mn元素。中间退火时铝箔厚度对力学性能有显著影响，这和厚度与晶粒尺寸之间的比值有关。室温储存会导致较薄铝箔的力学性能下降，这与大应变后发生的回复机制有关。

Abstract:

Direct chill casting (DCC) and twin roll casting (TRC) methods were applied to produce 1XXX series aluminium blanks with different contents of Fe, Si, Cu, and Mn elements. Different treatments, including homogenization, hot rolling, cold rolling, and annealing, were subsequently applied to produce the aluminium foil of 13 μm in thickness. Results show that the casting process barely affects the tensile strength of the aluminium foil, while the fine particles of secondary phase introduced by twin roll casting has a positive effect on the elongation of aluminium foil. The coarse grain boundary intermetallic in ingots after DCC can be refined at homogenization temperature above 580 °C, and subsequently be broken into small particles through the following hot rolling process. The addition of Cu is better than that of Fe, Si, or Mn elements, as Cu solute atoms can increase the strain hardening rate. The foil thickness greatly affects the tensile properties during intermediate annealing process, which is related to the ratio of thickness to grain size. Room temperature storage causes deterioration of tensile properties of thin aluminium foil due to the recovery mechanism after application of very large strain.