张飞奇,陈文革,闫超峰.微量硼元素添加对Ti6Al4V-xB组织及性能的影响[J].稀有金属材料与工程,2018,47(3):932~936.[ZHANG Feiqi,CHEN Wenge,YAN Chaofeng.Effects of Trace Boron Addition on Microstructure and Properties of As-castTi6Al4V-xB Alloys[J].Rare Metal Materials and Engineering,2018,47(3):932~936.]
微量硼元素添加对Ti6Al4V-xB组织及性能的影响
投稿时间:2016-02-28  修订日期:2016-05-16
中文关键词:  Ti6Al4V合金  TiB  显微组织  力学性能
基金项目:西安市科技支撑项目(CXY1342(2))
中文摘要:
      采用高真空非自耗熔炼及吸铸方法制备不同硼含量的Ti6Al4V-xB(wt.%,x为0,0.05,0.1,0.5)合金,将合金在900℃下进行2h保温退火。研究了不同微量硼元素添加对Ti6Al4V-xB的铸造显微组织及力学性能的影响。结果表明,微量硼元素的添加影响了钛合金高温形核过程,在固-液前沿富集B元素阻碍初始β-Ti长大,有效细化钛合金晶粒,当硼含量超过0.1%时,则有TiB相的析出。Ti6Al4V-xB合金的强度极限随硼含量的增加单调上升,由893MPa变为966MPa,这是细晶强化和析出强化共同作用的结果;合金的塑性则是先升高后降低,Ti6Al4V-0.05B的塑性提高了15%,而Ti6Al4V-0.1B与Ti6Al4V-0.5B的塑性则降低了50%,是因为析出脆性的TiB相,形成脆性断裂敏感带。
Effects of Trace Boron Addition on Microstructure and Properties of As-castTi6Al4V-xB Alloys
英文关键词:Ti6Al4V alloys  TiB  microstructure  mechanical properties
英文摘要:
      The Ti6Al4V-xB(wt.%,x=0,0.05,0.1,0.15)alloys were prepared at 900 ℃ for 2h by non-consumable melting and suction casting. In this study, the effect of Ti6Al4V-xB alloys with doping different B proportion on as-cast microstructures and mechanical properties is analyzed. The results show that the addition of boron impacts the solidification process of titanium alloy. The enriched B in solid-liquid frontier retarded the growth of initial β-Ti and was effective to promote grain refining. When the boron proportion was more than 0.1%, TiB phases precipitated from liquid. The ultimate strength of Ti6Al4V-xB alloys increased with the proportion of B (893 Mpa to 966 Mpa), which are attributed to grain-refinement and precipitation strengthening. The change of alloy plasticity is first increases and then decreases, about increasing 15% of Ti6Al4V-0.05B alloy and about decreasing 50% of Ti6Al4V-0.1B and Ti6Al4V-0.5B. This is because the fragile precipitated-phase of TiB is formed , which can cause the crack-sensitive zone.
作者单位E-mail
张飞奇 西安理工大学材料科学与工程学院 hutom@126.com 
陈文革 西安理工大学材料科学与工程学院 wgchen001@263.net 
闫超峰 西安理工大学材料科学与工程学院  
摘要点击次数: 426
全文下载次数: 135
查看全文  查看/发表评论  下载PDF阅读器
关闭