合金元素及中间退火对Cu-Cr系形变原位复合材料组织和性能的影响

采用冷拔结合中间退火工艺制备出Cu-13%Cr-0.24%Zr、Cu-15%Cr-0.24%Zr和Cu-15%Cr形变原位复合线材。研究了Cr含量、Zr元素、中间退火温度及次数对线材极限抗拉强度及导电性能的影响。结果表明:Zr元素可显著提高材料的强度,且对其导电性能影响不大;提高Cr元素含量,对材料的强度有一定贡献,但效果不明显。增加中间退火次数和提高中间退火温度都会使材料的极限抗拉强度降低,导电率升高。本实验中,通过两次500oC中间退火工艺制备的Cu-15%Cr-0.24%Zr线材获得较为优异的综合性能,抗拉强度达到1056MPa,导电率达到73%IACS。

Effect of Alloying Elements and Intermediate Annealing on Microstructure and Properties of Cu-Cr Deformation Processed in situ Composites

Cu-13%Cr-0.24%Zr, Cu-15%Cr-0.24%Zr and Cu-15%Cr deformation in situ composite wires were prepared by cold drawing combined with intermediate heat treatments. The effects of Zr element, Cr content, intermediate annealing temperature and times on the ultimate tensile strength (UTS) and electrical conductivity of Cu-Cr composites were investigated. Results show that Zr element can significantly enhance the UTS, while its effect on the electrical conductivity is modest. With the increase of mass friction of the Cr element, the UTS tends to increase a bit, and it has little impact on the electrical conductivity. Increasing annealing temperature or times can decrease the UTS and improve the electrical conductivity. In the experiment Cu-15%Cr-0.24%Zr in situ deformation wires with excellent comprehensive properties were obtained through the process of twice intermediate annealing at 500 °C, whose UTS reaches 1056 MPa and whose electrical conductivity reaches 73%IACS