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尹雁飞,赵 彬,贾蔚菊,李思兰,毛成亮,应 扬,毛小南,赵永庆.双重时效对TC29钛合金组织和性能的影响[J].稀有金属材料与工程(英文),2019,48(9):3001~3006.[Yin Yanfei,Zhao Bin,Jia Weijv,Li Silan,Mao Chengliang,Ying Yang,Mao Xiaonan and Zhao Yongqing.Influence of duplex aging on microstructure and mechanical properties of TC29 titanium alloy[J].Rare Metal Materials and Engineering,2019,48(9):3001~3006.]
Influence of duplex aging on microstructure and mechanical properties of TC29 titanium alloy
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Received:November 28, 2018  Revised:April 23, 2019
DOI:
Key words: near β titanium  duplex aging  secondary α phase  microhardness
Foundation item:国家重点研发计划项目(2016YFB0301201);陕西省重点研发计划项目(2017KW-ZD-08)
Author NameAffiliation
Yin Yanfei,Zhao Bin,Jia Weijv,Li Silan,Mao Chengliang,Ying Yang,Mao Xiaonan and Zhao Yongqing  
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Abstract:
      In order to find the influence of duplex aging on microstructure and mechanical properties of TC29 titanium alloy accompanied with primary α phase, different heat treatments and analysis methods including OM, SEM, and TEM were adopted. Results show that after treated by α+β two-phase solution and aging secondary α precipitates in TC29 titanium alloy are sub-micron level. After 895℃ solution and single aging, secondary α precipitates are mainly 100~300 nm in length. After 895℃ solution and duplex aging, "α clusters" are observed in β transformed microstructure and secondary α precipitates in them are thin slat-shaped. Compared with single aging, duplex aging results in an equal or lower microhardness. During the pre-aging treatment, a large amount of ω phases precipitate in β matrix, and the local element distribution gradually becomes inconsistent due to the diffusion near the primary α/β phase interface, where the “α cluster” is locally formed during the subsequent aging process.