Cu对热挤压Al-Mg-Si合金力学性能及导电率的影响

为了满足铝合金架空输电导线的使用需求,以热挤压法制备的Al-Mg-Si合金电工铝杆为研究对象,通过调节Cu元素的添加量,研究了Cu对Al-Mg-Si合金的力学性能及导电率的影响.结果表明,向Al-0.35Si-0.45Mg-0.13Fe合金中添入微量Cu元素后,Mg2Si析出相得到细化且时效强度提高.随着Cu元素含量的增加,峰时效时间缩短,合金抗拉强度不断提高,但伸长率逐渐降低.当Cu含量为0.06%时,合金抗拉强度达到最大值145.7 MPa.合金导电率随着Cu元素含量的增加先升后降,当Cu含量为0.03%时达到最大值60.18%IACS.

Effect of Cu on mechanical properties and electrical conductivity of hot-extruded Al-Mg-Si alloy

In order to meet the use demand of overhead aluminium alloy transmission wires, the Al-Mg-Si electrical aluminium rod prepared with hot extrusion method was taken as the research subject, and the effect of Cu element on the mechanical properties and electrical conductivity of Al-Mg-Si alloy was studied through adjusting the additive amount of Cu element. The results show that when the trace Cu element is added into the Al-0.35Si-0.45Mg-0.13Fe alloy, the Mg₂Si precipitate is refined and the aging strength gets improved. With increasing the Cu content, the peak aging time is shortened, and the ultimate tensile strength of the alloy is continuously enhanced, but the elongation gradually decreases. When the Cu content is 0.06%, the ultimate tensile strength of the alloy can reach the maximum value of 145.7 MPa. With increasing the Cu content, the electrical conductivity of alloy firstly increases and then decreases, and can reach the maximum value of 60.18% IACS when the Cu content is 0.03%.