電學性能的影響
(浙江大學 材料與化學工程學院， 杭州 310027)
摘 要: 采用冷變形及中間熱處理方法制備了具有雙相纖維復(fù)合組織的Cu-Ag合金，研究了成分與組織、 性能的關(guān)系。 隨著變形程度的增加， 合金強度上升而電導(dǎo)率下降。 合金中Ag含量由6%增加至24%時， 鑄態(tài)組織中第二相數(shù)量明顯增多， 變形后能夠形成更多的Ag纖維復(fù)合相， 因而合金強度明顯上升。 在Cu-6%Ag中添加1%Cr元素可以使合金基體得到進一步強化并在一定程度上細化了Ag纖維相， 也可使合金強度得到顯著改善。在Cu-6%Ag-1%Cr合金中添加微量稀土元素可使Ag纖維分布更為彌散，因而使合金在不降低導(dǎo)電性的同時增加強度， 尤其在高強度范圍內(nèi)這種作用更為顯著。
關(guān)鍵字: Cu-Ag合金； 合金元素； 顯微組織；力學性能； 相對電導(dǎo)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
