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王文婷,李沛,孙巧艳,刘彬,肖林,孙军.时效温度对Ti1023和Ti5553合金a相析出行为与力学性能的影响规律[J].稀有金属材料与工程(英文),2020,49(5):1707~1714.[Wenting Wang,Pei Li,Qiaoyan Sun,Bin Liu,Lin Xiao and Jun Sun.The effect of microstructure and mechanical properties in Ti1023 and Ti5553 alloys during different aging temperature[J].Rare Metal Materials and Engineering,2020,49(5):1707~1714.]
The effect of microstructure and mechanical properties in Ti1023 and Ti5553 alloys during different aging temperature
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Received:February 26, 2019  Revised:June 26, 2019
DOI:
Key words: β titanium alloy  the secondary α phase  Aging  Hardening
Foundation item:国家科学自然基金(51671158, 51621063);国家重点基础研究发展计划(“973”计划课题)(2014CB644003);高等学校学科创新引智计划2.0(PB2018008)
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Wenting Wang,Pei Li,Qiaoyan Sun,Bin Liu,Lin Xiao and Jun Sun  
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Abstract:
      The microstructures and precipitation hardening of Ti1023 and Ti5553 alloys in the same solution treatment and step-quench aging treatment (ST-SQA) have been studied. The morphology of α phase about precipitation and distribution in different aging treatment were observed carefully by using SEM and TEM, and the variation of density and width of secondary α phase were analyzed. The hardness of these two alloys was measured. The result shows that: Ti1023 alloy is more likely to precipitate α phase than Ti5553 alloy due to low stability of ? phase. Ti1023 alloy precipitates α phase at 300℃ aging and get the maximum density of precipitation at 400℃,while Ti5553 alloy precipitates α phase at 450℃, and get the maximum density of precipitation at 550℃. As for Ti1023 alloy, the peak of hardness is obtained at 400℃ aging, while as for Ti5553 alloy, double peaks of hardness are shown at 350℃ and 550℃ aging, respectively. The variation of hardness was caused by the precipitation of secondary phase in ? phase for different aging temperatures. When aging temperature is below 400℃, the hardness of Ti1023 alloy depends on both α phase and ω phase, and the hardness of Ti15553 alloy depends on only ω phase. As aging temperature is over 400℃, the hardness of both Ti1023 and Ti5553 alloys depend on the density of precipitation and the size of α phase.