热处理对机械合金化Cu-25Ag合金组织和性能的影响  

Effects of Heat Treatment on Microstructure and Properties of Mechanical Alloying Cu-25Ag Alloy

作　　者：李欣 张林[1] 张道琦 郭晓 王恩刚[1] Li Xin;Zhang Lin;Zhang Daoqi;Guo Xiao;Wang Engang(Key Laboratory of Electromagnetic Processes for Materials,Ministry of Education,Northeastern University;School of Metallurgy,Northeastern University)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室 [2]东北大学冶金学院

出　　处：《特种铸造及有色合金》2023年第3期374-378,共5页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2017YFE0107900);国家自然科学基金资助项目(51674083);国家111计划2.0资助项目(BP0719037)。

摘　　要：采用高能球磨机械合金化的方法制备Cu-25Ag合金,并进行100~700℃不同温度的退火,研究了其组织及性能随热处理温度的演变。结果表明,高能球磨使Ag过饱和固溶于Cu基体中,球料比为10∶1时,Cu的晶粒尺寸达到最小值4.73 nm,Ag在Cu中的固溶度显著提升至16.41%。热处理可使Cu-25Ag合金孔隙减小,固溶的Ag析出为富Ag相,其尺寸随温度的升高而粗化。随着热处理温度升高,合金硬度先升后降,电阻先大幅下降后趋于稳定。150℃时合金的硬度(HV)达到215.39,电阻率在450℃时达到最低值。Cu-25Ag alloys fabricated by high-energy ball milling mechanical alloying were annealed at various temperatures in the range of 100~700 C,and the evolution of microstructure and performance with heat-treatment temperatures was investigated.The results indicate that Ag can be supersaturated and soluted in Cu matrix by high-energy ball milling.When the ratio of ball to material is lo:l,the grain size of Cu reaches the minimum of 4.73 nm and the solid solubility of Ag increase to 16.41%.Heat treatment can reduce the porosity of Cu-25Ag alloy,and Ag in solution is precipitated as Ag-rich phase,which is coarsened with annealled temperature increasing.With the increase of heat-treatment temperature,the hardness of alloy is firstly increased and then decreased monotonously,and the resistance is decreased sharply and then remain stable.The hardness of the alloy reaches the peak value of 215.39 HV at heat-treatment temperature of 150 C,and the resistivity reaches the minimun at 450℃.

关 键 词：CU-AG合金 热处理温度 显微组织 力学性能 电学性能 

分 类 号：TG146.32[一般工业技术—材料科学与工程] TG166.2[金属学及工艺—金属材料]