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材料工程  2015, Vol. 43 Issue (1): 37-43    DOI: 10.11868/j.issn.1001-4381.2015.01.007
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
Ti3Al和Ti2AlNb合金扩散连接界面的组织及力学性能
李万青1,2, 魏红梅1, 何鹏1, 高丽娇1,3, 林铁松1, 李小强1, 赫兰春1
1. 哈尔滨工业大学 先进焊接与连接国家重点实验室, 哈尔滨 150001;
2. 北京航空材料研究院, 北京 100095;
3. 北京星航机电装备有限公司, 北京 100074
Interfacial Microstructure and Mechanical Properties of Diffusion Bonding of Ti3Al and Ti2AlNb Alloys
LI Wan-qing1,2, WEI Hong-mei1, HE Peng1, GAO Li-jiao1,3, LIN Tie-song1, LI Xiao-qiang1, HE Lan-chun1
1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China;
3. Beijing Xinghang Mechanical and Electrical Equipment Co., Ltd., Beijing 100074, China
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摘要 采用直接扩散连接Ti3Al和Ti2AlNb合金,研究了连接压力、连接温度、保温时间等工艺参数对接头界面组织形貌及性能的影响.利用扫描电镜、能谱分析和X射线衍射等方法观察分析了界面组织结构,并测试了接头的力学性能.结果表明:直接固相扩散连接接头的典型组织为Ti3Al/O相+α2相过渡层/富B2层/Ti2AlNb.当连接温度为1000℃,保温时间60min,连接压力为5MPa时获得的接头室温抗剪强度为635MPa,室温抗拉强度为795MPa,均断裂于Ti3Al母材一侧.经1000℃/60min热循环后Ti3Al母材的抗拉强度下降至原始母材的76%.连接温度低于950℃或保温时间小于60min会导致未焊合等缺陷;温度高于1050℃或保温时间超过120min则导致Ti3Al发生相变.
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李万青
魏红梅
何鹏
高丽娇
林铁松
李小强
赫兰春
关键词 扩散连接Ti3Al合金Ti2AlNb合金微观组织性能    
Abstract:Ti3Al and Ti2AlNb alloys were joined by direct diffusion welding. The influence of bonding pressure, bonding temperature and holding time on the interface morphology and property of the joint was studied. The interface structure was analyzed by SEM, EDS and XRD, and the mechanical properties of joints were tested. The results show that typical interface structure of direct diffusion bonding joints is Ti3Al/O-phase and α2-phase/B2-rich phase/Ti2AlNb. When bonding temperature is 1000℃, holding time is 60min, bonding pressure is 5MPa, the shear strength could reach 635MPa and the tensile strength could reach 795MPa. Both joints fracture at the Ti3Al-base alloy. After thermal cycling (1000℃/60min), the tensile strength of Ti3Al decreases to 76% of the original strength. Welding defects occur when bonding temperature is below 950℃ or holding time is less than 60min. The bonding temperature higher than 1050℃ or holding time more than 120min will lead to phase transition of Ti3Al.
Key wordsdiffusion bonding    Ti3Al alloy    Ti2AlNb alloy    microstructure    property
收稿日期: 2013-12-10     
1:  TG453+.9  
基金资助:国家自然科学基金资助项目(51275135,51305102);高等学校博士学科点专项科研基金优先发展领域课题(20112302130005)
通讯作者: 何鹏(1972-),男,博士,教授,主要从事钎焊、微连接及可靠性基础理论与实际应用技术方面的研究工作,联系地址:黑龙江省哈尔滨市南岗区西大直街92号哈尔滨工业大学材料学院824室(150001),hithepeng@hit.edu.cn     E-mail: hithepeng@hit.edu.cn
引用本文:   
李万青, 魏红梅, 何鹏, 高丽娇, 林铁松, 李小强, 赫兰春. Ti3Al和Ti2AlNb合金扩散连接界面的组织及力学性能[J]. 材料工程, 2015, 43(1): 37-43.
LI Wan-qing, WEI Hong-mei, HE Peng, GAO Li-jiao, LIN Tie-song, LI Xiao-qiang, HE Lan-chun. Interfacial Microstructure and Mechanical Properties of Diffusion Bonding of Ti3Al and Ti2AlNb Alloys. Journal of Materials Engineering, 2015, 43(1): 37-43.
链接本文:  
http://jme.biam.ac.cn/jme/CN/10.11868/j.issn.1001-4381.2015.01.007      或      http://jme.biam.ac.cn/jme/CN/Y2015/V43/I1/37
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