电学性能的影响
(浙江大学 材料与化学工程学院， 杭州 310027)
摘 要: 采用冷变形及中间热处理方法制备了具有双相纤维复合组织的Cu-Ag合金，研究了成分与组织、 性能的关系。 随着变形程度的增加， 合金强度上升而电导率下降。 合金中Ag含量由6%增加至24%时， 铸态组织中第二相数量明显增多， 变形后能够形成更多的Ag纤维复合相， 因而合金强度明显上升。 在Cu-6%Ag中添加1%Cr元素可以使合金基体得到进一步强化并在一定程度上细化了Ag纤维相， 也可使合金强度得到显著改善。在Cu-6%Ag-1%Cr合金中添加微量稀土元素可使Ag纤维分布更为弥散，因而使合金在不降低导电性的同时增加强度， 尤其在高强度范围内这种作用更为显著。
关键字: Cu-Ag合金； 合金元素； 显微组织；力学性能； 相对电导率
（College of Materials Science and Chemical Engineering,
Zhejiang University,Hangzhou 310027, China）
Abstract:The wires of two-phase Cu-Ag based alloys were obtained by cold drawing combined with intermediate heat treatments and the effects of alloying additions on microstructure and properties investigated by changing the Ag content and adding Cr or rare earth elements. With increasing in draw ratio, the tensile strength of the wires increases but the electrical conductiv, ity reduces. When the Ag content is increased from 6% to 24%, the strength of the wire increases obviously because of the strengthening of more Ag filaments in the alloy after cold drawing. The strength increases significantly if 1%Cr is added to the alloy Cu-6%Ag, which is associated with the strengthening of Cu-matrix and the refinement of the Ag filaments by effects of Cr element. Suitable microalloying of the rare earth elements in Cu-6%Ag-1%Cr alloy further improves the strength and hardly reduces the conductivity, in special, at high strain level with high strength.
Key words: Cu-Ag based alloy; alloying element; microstructure; mechanical property; electrical conductivity
