高强高导Cu-Sn-Fe合金的微观组织与性能

采用自制的铜模具制备不同成分Cu-xSn-yFe(其中x、y表示质量百分比)合金,研究对比了铸态及不同处理态下Cu-xSn-yFe合金抗拉强度和电阻率的变化规律。结果表明:随着Sn和Fe添加量的增加,Cu-xSn-yFe合金的抗拉强度和电阻率均增加。正火处理会增加合金电阻率,而与正火态的电阻率相比,轧制后的电阻率皆较低。Sn含量的变化对Cu-xSn-yFe合金电阻率的影响较大,降低含Sn量可改善Cu-xSn-yFe合金的导电性。经退火处理后,Cu-xSn-yFe合金的电阻率明显降低,抗拉强度也会略有所降低。当Fe含量为10 wt·%,Sn含量为3 wt·%时,该合金冷轧制处理后的抗拉强度达775 MPa,但电阻率仅为7.509μΩ·cm.当Fe含量为5 wt·%,Sn含量为2 wt·%时,该合金经退火处理后其抗拉强度为552 MPa,且电阻率为1.92μΩ·cm.

Microstructures and Properties of Cu-Sn-Fe Alloys with High Strength and High Conductivity

Cu-xSn-yFe （ x,y represented wt. %, similarly hereinafter） alloys with different ingredients were prepared by self-made copper mold. The changes of tensile strength and resistivity of Cu-xSn-yFe alloys under different treat- ment conditions were explored in this work. Results showed that the tensile strength and the resistivity of Cu-xSn- yFe alloys increased with the increasing content of Sn and Fe. The resistivity of Cu-xSn-yFe alloys increased after normalizing treatment. Compared with the resistivity of the normalized alloys, it was low after rolling. The resistivity of alloys was influenced strongly by the variation of Sn content, and the conductivity of Cu-xSn-yFe alloys could be improved by reducing the content of Sn. After annealing, Cu-xSn-yFe alloy resistivity will be significantly reduced and the tensile strength will be slightly reduced. After cold rolling, the tensile strength of the Cu-3Sn-10Fe alloy reached 775 Mpa, but its resistivity was only 7. 509μΩ·cm. After annealing, the tensile strength and resistivity of Cu-2Sn-5Fe alloy was 552 Mpa and 1.92 μΩ·cm,respectively.