(中國科學院 金屬研究所，沈陽 110016)
摘 要: 研究了熔鑄法制備的CuCr25合金的形變和熱處理過程及在不同的冷軋與熱處理制度下合金顯微組織的特點。試驗結(jié)果表明，熔鑄法制備的CuCr合金具有良好的塑性變形能力，冷軋形變量可達95%以上。當冷軋形變量達到70%以上時，合金中第二相Cr開始產(chǎn)生形變；形變量達95%以上時，Cr粒子產(chǎn)生大量形變，并呈纖維狀分布。形變合金在1073K退火1h后，纖維狀Cr相發(fā)生顯著細化和球化，平均半徑小于10μm。因而，采用合適的形變與熱處理方法可以細化合金中的第二相Cr粒子。
關(guān)鍵字: CuCr合金；形變；熱處理；顯微組織
refinement of CuCr25 alloy
（Institute of Metal Research，Chinese Academy of Sciences，
Shenyang 110016，China）
Abstract:The deformation and heat treatment of casting CuCr25 alloy were studied for the finer Cr particles in the microstructure. The characteristics of the alloy under different cold rolling reduction and heat treatment temperature were investigated. The results show that，the plasticity of CuCr25 alloy is excellent. The reduction of the casting alloy can be as high as 95% in cold rolling at room temperature. When the reduction is more than 70%，the second phase Cr particles begin to deform，and when the reduction is up to 95%，Cr particles are deformed heavily and form a fiber morphology. After annealing at 1073K for one hour，the fiber of Cr in the microstructure is broken into some short-rod particles，and tend to turn into spherical morphology. The average Cr particle size is less than 10μm. According to these results，the processing of the deformation and heat treatment for the casting CuCr25 alloy is suggested to obtain a finer Cr phase in the microstructure.
Key words: CuCr alloy；deformation；heat treatment；microstructure
