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,2020,49(5):1707~1714.[Wenting Wang,Pei Li,Qiaoyan Sun,Bin Liu,Lin Xiao,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.]
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
投稿时间:2019-02-26  修订日期:2019-06-26
中文关键词:  高强β钛合金  次生α相  时效  硬化
基金项目: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)
中文摘要:
      本文研究了Ti1023和Ti5553钛合金经过固溶与低温时效处理(ST-SQA)获得的微观组织和析出硬化行为。采用扫描电镜和透射电镜观察了不同温度时效处理后α相的析出形貌以及分布特点,统计了时效析出次生α相的析出密度和宽度随时效温度的变化情况,并测试了合金的维氏硬度。结果表明: Ti1023合金时效处理时次生α的析出温度低于Ti 5553合金。Ti1023合金在300℃时效时α相已经析出,400℃时α相析出密度到达峰值;Ti5553合金在450-500℃时效α相开始析出,在550℃时效α相的析出密度达到峰值。Ti1023合金硬度随着时效温度的增加先升后降,400℃时效硬度最高;在相同的时效温度范围,Ti5553合金硬度变化出现双峰规律,硬度峰值分别对应于350℃和550℃时效温度。两种合金的硬度变化规律源于合金时效中第二相的析出行为:时效温度低于400℃,Ti1023合金的硬度取决于α相和?相,而Ti5553合金的硬度取决于?相;温度高于400℃,两种合金的硬度主要取决于次生α相的数量与尺寸。
The effect of microstructure and mechanical properties in Ti1023 and Ti5553 alloys during different aging temperature
英文关键词:β titanium alloy  the secondary α phase  Aging  Hardening
英文摘要:
      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.
作者单位E-mail
王文婷 西安交通大学 2657110835@qq.com 
李沛 西安交通大学  
孙巧艳 西安交通大学 qysun@mail.xjtu.edu.cn 
刘彬 中南大学  
肖林 西安交通大学  
孙军 西安交通大学  
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