王芬,艾桃桃,罗宏杰

• 1:陕西科技大学材料科学与工程学院
• 2:陕西理工学院材料学院
• 3:中国科学院上海硅酸盐研究所 陕西西安710021
• 4:陕西汉中723003

摘要(Abstract)：

以Ti、Al、TiO2和Nb2O5混合粉原位反应合成Al2O3/TiAl复合材料。借助差热分析探讨体系的反应过程,并对合成产物的微观结构和力学性能进行研究。结果表明:由于铝热反应释放了大量热量导致体系内温度较高,反应较早进行,利于实现低温致密化烧结。1200℃烧成后获得了γ+(α2/γ)双相组织。Nb2O5的加入细化了复相组织,提高了自生Al2O3颗粒的分散度及产物的致密度。加入适量Nb2O5后,复合材料的维氏硬度、抗弯强度和断裂韧性得到不同程度的提高;在Nb2O5掺杂量为6wt%时,硬度达到4.84GPa,抗弯强度为642MPa,断裂韧性达6.69 MPa.m1/2。复合材料的强化机制主要是由于Nb2O5的加入改善了复合材料的微观组织和使得Al2O3呈弥散分布。

关键词(KeyWords)： Al2O3颗粒;TiAl基复合材料;显微结构;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(50672056,50432010)

作者(Author): 王芬,艾桃桃,罗宏杰

参考文献(References)：

• [1]Dimiduk D M.Gamma titanium aluminide alloys-an assessment within the competition of aerospace structural materials[J].Materials Science and EngineeringA,1999,263(2):281-288.
• [2]Loria E A.Gamma titanium aluminides as prospective structural materials[J].Intermetallics,2000,8:1339-1345.
• [3]Mutoh Y,Zhu S J,Hansson T,et al.Effect of microstructure on fatigue crack growth in TiAl intermetallics at elevated temperature[J].Materials Scienceand Engineering A,2002,323(1-2):62-69.
• [4]Mei Bingchu,Miyamoto Yoshinari.Investigation of TiAl/Ti2AlC composites prepared by spark plasma sintering[J].Materials Chemistry and Physics,2002,75(1-3):291-295.
• [5]孙祖庆,张来启,杨王,等.原位合成MoSi2-SiC复合材料的室温增韧[J].金属学报,2001,37(1):104-108.SUN Zu-qing,ZHANG Lai-qi,YANG Wang-yue,et al.Toughening of MoSi2-SiC composite synthesized in situ[J].Acta Metallurgica Sinica,2001,37(1):104-108.
• [6]Kattner U R,Lin J C,Chang Y A.Thermodynamic assessment and calculation of the Ti-Al system[J].Metall Mater Tran,1992,23A(8):2081-2090.
• [7]Feng C F,Froyen L.On the reaction mechanism of an Al-TiO2-B system for producing in-situ(Al2O3+TiB2)/Al composite[J].Scripta Metall Mater,1998,39(1):109-118.
• [8]安世武,王芬,朱建锋,等.原位热压合成Nb掺杂Al2O3/TiAl复合材料[J].材料科学与工程学报,2006,24(3):443-447.AN Shi-wu,WANG Fen,ZHU Jian-feng,et al.Nb-doped Al2O3/TiAl composites synthesized by in-situ reaction hot-pressing processes[J].Journal ofMaterials Science and Engineering,2006,24(3):443-447.
• [9]Schicker S,Garcia D E,Bruhn J,et al.Reaction synthesized Al2O3-based intermetallic[J].Acta Mater.,1998,46(7):2485-2492.
• [10]梁英教.物理化学[M].北京:冶金工业出版社,1995:204.
• [11]Li Z W,Gao W,Zhang D L,et al.High temperature oxidation behavior of a TiAl-Al2O3intermetallic matrix composite[J].Corrosion Science,2004,46(8):1997-2007.
• [12]武高辉,于志强,孙东立,等.亚微米Al2O3颗粒表面稀土改性及其对6061Al复合材料时效行为的影响[J].金属学报,2003,39(8):870-874.WU Gao-hui,YU Zhi-qiang,SUN Dong-li,et al.Rare-earth modification of sub-micron Al2O3particle surface and its effect on the aging behavior of 6061Alcomposite[J].Acta Metallurgica Sinica,39(8):870-874.
• [13]孙伟成,张淑荣,侯爱芹.稀土在铝合金中的行为[M].北京:兵器工业出版社,1992.
• [14]王芬,艾桃桃,罗宏杰,等.双相TiAl基复合材料的强化机理分析[J].航空材料学报,2007,37(3):11-16.WANG Fen,AI Tao-tao,LUO Hong-jie,et al.Analysis of strengthening mechanism in two-phase TiAl-based composites[J].Journal of AeronauticalMaterials,2007,37(3):11-16.

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