形变时效对不同Cu含量的稀土铝电工圆杆的影响

Effect of strain aging on rare earth electrical round aluminum rods with different Cu contents

铝电工圆杆是电缆、电线的坯料,其质量好坏直接影响铝导线的优劣。通过扫描电镜、X射线物相分析等方法,对比铸态、轧制态和形变时效态下不同Cu含量的稀土铝电工圆杆的抗拉强度和导电率,研究形变热处理对铝电工圆杆的影响。结果表明:经过形变热处理后,试样的晶界得到薄化,组织更加均匀;当Cu含量为0.2%时,通过(500℃,3 h固溶处理)+85%轧制+(150℃,12 h时效)的形变热处理,试样抗拉强度达到179 MPa,导电率为60.78%IACS,综合性能较佳。

Electrical round aluminum rods are used as blank of cables and wires,their quality directly influences the merits of the aluminum wire.The tensile strength and electrical conductivity of rare earth electrical round aluminum rods with different Cu contents under the conditions of as-cast,rolling state and strain aging,respectively,were compared by scanning electron microscope,X-ray diffraction analysis and other methods.The effect of thermomechanical treatment on the properties of electrical round aluminum rods was studied.The result show that after deformation treatment treatment,the grain boundary of samples becomes thinner than former,the microstructure is more compact and well-distributed.The comprehensive performance of sample is better after(500 ℃,3 h,solid solution)+85% rolling+(150 ℃,12 h,aging) thermomechanical treatment,when the Cu content of specimen is 0.2%,the tensile strength of specimen reaches to peak value(179 MPa),and the electrical conductivity is 60.78%IACS.