形變時(shí)效對(duì)不同Cu含量的稀土鋁電工圓桿的影響

形變時(shí)效對(duì)不同Cu含量的稀土鋁電工圓桿的影響Effect of strain aging on rare earth electrical round aluminum rods with different Cu contents

鋁電工圓桿是電纜、電線的坯料，其質(zhì)量好壞直接影響鋁導(dǎo)線的優(yōu)劣。通過(guò)掃描電鏡、X射線物相分析等方法，對(duì)比鑄態(tài)、軋制態(tài)和形變時(shí)效態(tài)下不同Cu含量的稀土鋁電工圓桿的抗拉強(qiáng)度和導(dǎo)電率，研究形變熱處理對(duì)鋁電工圓桿的影響。結(jié)果表明：經(jīng)過(guò)形變熱處理后，試樣的晶界得到薄化，組織更加均勻；當(dāng)Cu含量為0.2%時(shí)，通過(guò)(500 ℃，3 h固溶處理)+ 85%軋制+(150 ℃，12 h時(shí)效)的形變熱處理，試樣抗拉強(qiáng)度達(dá)到179 MPa，導(dǎo)電率為60.78%IACS，綜合性能較佳。

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.

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