稀土铝合金导线的合金化与性能研究

Study on Alloying and Properties of Rare Earth Aluminum Alloy Wire

通过单独添加Er和复合添加Er、Ce制备了3种不同组分的稀土铝合金导线,对比分析3种铝合金导线的显微形貌、导电性能、常温力学性能和强度高温保持率,分析稀土Er元素的作用机理。结果表明,稀土铝合金导线的抗拉强度、断后伸长率和导电率从高至低的顺序为:(Al-0.1Er-0.03Zr)>(Al-0.05Er-0.03Zr-0.05Ce)>(Al-0.05Er-0.03Zr);(Al-0.1Er-0.03Zr)和(Al-0.05Er-0.03Zr-0.05Ce)合金的电阻温度系数α均低于纯Al,而Al-0.05Er-0.03Zr合金导线的电阻温度系数α高于纯Al;三种铝合金导线的耐热性能都满足90%拉伸强度保持率温度必须达到230℃以上的要求;三种稀土铝合金导线中Al-0.1Er-0.03Zr合金的强塑性和导电性最好,这主要是由于Er元素的固溶强化、第二相强化和细晶强化作用。

Three kinds of rare earth aluminum alloy wires were prepared by adding Er and compound adding Er and Ce,the microstructure,electrical conductivity,room temperature mechanical properties and high temperature retention rate of 3 kinds of aluminum alloy wires were compared and analyzed,and the action mechanism of Er elements was also analyzed.The results show that the rare earth Aluminum Alloy wire tensile strength,elongation and electrical conductivity from high to low is as flows,Al-0.1 Er-0.03 Zr,Al-0.05 Er-0.03 Zr-0.05 Ce and Al-0.05 Er-0.03 Zr;The resistance temperature coefficient of Al-0.1 Er-0.03 Zr and Al-0.05 Er-0.03 Zr-0.05 Ce alloys is lower than that of pure Al wire,while the resistance temperature coefficient of Al-0.05 Er-0.03 Zr alloy wire is higher than that of pure Al wire;Heat resistance of three kinds of Aluminum Alloy wires are meet the 90% tensile strength retention temperature must reach more than 230 ℃;The Al-0.1 Er-0.03 Zr alloy wire has the best strength and conductivity in three kinds of rare earth aluminum alloy wires,which is mainly due to the solid solution strengthening,second phase strengthening and fine grain strengthening effect of Er element.