Cu-Ti-Cr-Mg合金在热机械处理过程中组织与性能演变  

Microstructure and properties evolution of Cu-Ti-Cr-Mg alloy during thermomechanical treatment

作　　者：蔚宏利 卫欢 杜华云[1] 卫英慧[1] 侯利锋[1] WEI Hongli;WEI Huan;DU Huayun;WEI Yinghui;HOU Lifeng(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;College of Aeronautics and Astronautics,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]太原理工大学航空航天学院,太原030024

出　　处：《中国有色金属学报》2024年第9期2966-2977,共12页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52201226);山西省重点研发计划资助项目(202102050201010);山西省科技创新人才团队专项计划资助项目(202204051001004);山西省基础研究计划资助项目(202103021223036);山西省重点科研资助项目(202102050201007)。

摘　　要：合金化是提高Cu-Ti合金性能的主要手段之一,有望获得高性能来替代Cu-Be合金。本文设计了一种Cu-4Ti-0.5Cr-1Mg合金,研究了热机械处理对Cu-Ti合金组织和性能的影响。通过光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)对合金的微观结构及相组成进行分析,并测试了材料的力学性能和导电性。结果表明:Cr、Mg合金元素的加入未改变Cu-Ti合金的时效序列,但形成了Cr_(2)Ti金属间化合物,且长时间时效时抑制了β-Cu_(4)Ti相的析出。40%冷轧后,380℃等温时效1 h合金获得优良的综合性能,硬度和强度分别为350HV和1220 MPa,导电率为10.84%IACS。设计合金的超高强度主要归因于β'-Cu_(4)Ti弥散析出强化和加工硬化。Alloying is one of the main methods to improve the performance of Cu-Ti alloys,and it is expected to obtain high performance to replace Cu-Be alloys.A Cu-4Ti-0.5Cr-1Mg alloy was designed,and the effects of thermomechanical treatment on the microstructure and properties of the alloy were investigated.Optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray diffractometry(XRD)were used to analyze the microstructure and phase constituents,and the mechanical properties and electrical conductivity of the material were determined as well.The results show that the addition of Cr and Mg alloy elements does not change the aging sequence of Cu-Ti alloy,but lead to the formation of Cr_(2)Ti intermetallic compounds,and precipitation ofβ-Cu_(4)Ti phase is inhibited with the increase of the aging time.After 40%cold rolling and 380℃aged for 1 h,the alloy can acquire excellent comprehensive properties,the hardness and strength are 350HV and 1220 MPa,respectively,and the conductivity is 10.84%IACS.The ultra-high strength of design alloys is mainly attributed toβ′-Cu_(4)Ti dispersion precipitation strengthening and work hardening.

关 键 词：Cu-Ti合金 时效处理 析出强化 微观组织 

分 类 号：TG146.1[一般工业技术—材料科学与工程]