细晶铝锭熔炼的6063铝合金组织与性能研究

Structure and Properties of 6063 Aluminum Alloys Produced with Grain-refining Aluminum Ingots

细晶铝锭是采用纯铝的电解设备,通过向铝电解槽中添加TiO2,直接电解生产的晶粒细化的铝锭。采用细晶铝锭熔炼6063铝合金,并对其组织性能进行研究,结果表明:细晶铝锭熔炼6063铝合金,由于其电解加钛方式,生产成本低廉;细晶铝锭熔炼的6063铝合金型材,晶粒细小均匀,表面性能及力学性能完全满足GB/T5237的要求;细晶铝锭、RE(富铈混合稀土)元素联合细化,细晶铝锭、RE、B元素联合细化熔炼的6063铝合金,抗拉强度与添加Al-5Ti-1B熔炼的6063铝合金相当,而伸长率提高20%,并可获得更优异的表面性能。

Grain-refining aluminum ingots with Ti contents lower than 0.2% were produced by direct electrolysis,in which TiO_2 was added into electrolytic pool for pure aluminum.The structure and properties of 6063 alloy produced with the grain-refining aluminum ingot were investigated.The results show that 6063 aluminum alloy with Ti addition by electrolyte has the advantages of low cost.The 6063 aluminum profile produced with grain-refining aluminum ingots whose surface performance and mechanical properties can fully meet the requirements of GB/T 5237 have fine and uniform grain.The tensile strength of 6063 aluminum alloy refined by both grain-refining aluminum ingot -RE and grain-refining aluminum ingot-Re-B is equivalent to that of the 6063 alloy refined by Al-5Ti-B master alloy while increased by 20% in elongation,meanwhile,it has the better surface performance.