(1. 有研工程技術(shù)研究院有限公司 有色金屬材料制備加工國家重點實驗室，北京 101400；
2. 北京有色金屬研究總院，北京 100088；
3. 有研粉末新材料(北京)有限公司，北京 101400)
摘 要: 采用上引連鑄-連續(xù)擠壓技術(shù)制備Cu-0.88Cr-0.14Zr(質(zhì)量分數(shù))合金，并對擠壓后的棒材進行不同制度的時效處理。利用掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM)、電子背散射技術(shù)(EBSD)等分析測試手段研究合金經(jīng)不同工藝/制度處理后的組織與性能的變化。結(jié)果表明：上引連鑄Cu-Cr-Zr合金棒坯在連續(xù)擠壓過程中發(fā)生了劇烈的剪切變形和動態(tài)時效，晶粒明顯細化，析出尺寸為15~20 nm的Cr相，與鑄態(tài)相比，擠壓態(tài)合金的導(dǎo)電率與硬度分別增加了28.6%IACS、49.6 HV。確定了擠壓態(tài)合金桿材經(jīng)(925 ℃，12 h)均勻化退火和(1000 ℃，1 h)固溶處理后的峰時效制度是(475 ℃, 3 h)，此時基體中析出了平均晶粒尺寸為2.6 nm的Cr相，合金的導(dǎo)電率和硬度分別可達73%IACS、155 HV。
關(guān)鍵字: Cu-0.88Cr-0.14Zr合金；上引連鑄-連續(xù)擠壓；時效處理；導(dǎo)電率；硬度
（1. State Key Laboratory of Nonferrous Metals & Processes, GRIMAT Engineering Institute Co., Ltd., Beijing 101400, China;
2. General Research Institute for Nonferrous Metals, Beijing 100088, China;
3. GRIPM Advanced Materials Co., Ltd., Beijing 101400, China）
Abstract:Cu-0.88Cr-0.14Zr (mass fraction) alloy was prepared by up-drawn casting and continuous extrusion technology, and then the extruded bar was aged at different temperature for different time. The evolution of microstructure and properties of the alloy treated by different processes were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron back-scattered diffraction technology (EBSD), and so on. The results show that the Cu-Cr-Zr alloy casting rod billet has severe shear deformation and dynamic aging happened during continuous extrusion process, the grains are refined obviously and the Cr phases with size of 15-20 nm are precipitated. Compared to as-cast alloys, the electrical conductivity and hardness of the as-extruded alloy increase by 28.6% IACS and 49.6 HV, respectively. The peak aging of the extruded alloy after homogenization annealing at (925 ℃, 12 h) and solution treatment at (1000 ℃, 1 h) is determined to be (475 ℃, 3 h). The Cr phase with average grain size of 2.68 nm is precipitated in the matrix after peak aging, and the electrical conductivity and hardness can reach 73% IACS and 155 HV, respectively.
Key words: Cu-0.88Cr-0.14Zr alloy; up-drawn casting-continuous extrusion; aging treatment; electrical conductivity; hardness
