时效过程中ω相辅助α相形核及α相对Ti-1300合金力学性能的影响  

α phase transformation assisted by ω phase and effect ofα phase on mechanical properties of Ti-1300 alloy during annealing

作　　者：李沛 高婷 寇文娟[1] 孙巧艳[1] 肖林[1] 孙军[1] LI Pei;GAO Ting;KOU Wen-juan;SUN Qiao-yan;XIAO Lin;SUN Jun(State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室

出　　处：《中国有色金属学报》2019年第5期963-971,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51671158,51471136,51621063);国家重点基础研究发展计划资助项目(2014CB644003);高等学校学科创新引智计划(B06025)~~

摘　　要：采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和显微硬度仪等技术对Ti-1300合金不同热处理工艺的试样进行了观察与表征,研究Ti-1300合金的ω相对时效过程中β→α相转变及微观组织与力学性能的影响.结果表明:固溶处理的试样以4℃/min的速率加热到350℃保温10 min,随后加热到500℃保温4 h,析出α相的平均尺寸(长度)为54 nm;而直接在500℃保温4 h析出α相的平均尺寸(长度)为202 nm.将固溶后的试样随炉加热(4℃/min)到350℃,β相中只有ω相析出;加热到400℃时,在组织中发现了α相依附ω相形核现象,加热到500℃保温4 h时,ω相消失,合金获得极为细小均匀的α相.时效过程中析出的α相对合金的硬化作用比ω相的更为显著.The microstructures of the aged samples after solution treatment with different aging treatments were observed and characterized by SEM,TEM and XRD.The effects ofωphase on theβ→αphase transformation and microstructures on Ti-1300 alloy were also studied.The results show that the average size(length)of precipitatedαphase is 54 nm after being heated at 350℃for 10 min and then being heated at 500℃for 4 h.The average size(length)of theαphase is 202 nm when the sample is directly held at 500℃for 4 h.Only nanoscale ω phase were observed in the sample being heated to 350℃at the rate of 4℃/min,whileαphase nucleation attached to ω phase was observed in the sample which is heated to 400℃.When the sample is heated continuously to 500℃and held for 4 h,ω phase disappeared and very fine uniform α precipitates are obtained in the microstructure.The hardening effect ofαphase is stronger than that of ω phase.

关 键 词：Ti-1300合金 时效 Ω相 α相形核 

分 类 号：TG146.4[一般工业技术—材料科学与工程]