Fabrication of Ti2AlC/Ti-44Al-6Nb-0.3Y Composite by Spark Plasma Sintering
TiAl based alloys are attractive for use in advanced propulsion systems for aircraft and also in automobile engine parts due to their low density, high specific strength,high specific stiffness,good creep strength up to 700℃ and better hightemperature oxidation resistance than titanium alloys. However, the low room temperature ductility and poor formability limit the extensive application of TiAl based alloys. It has been found that the intermetallic matrix composites (IMCs) can provide the right combination of high-temperature strength and creep resistance,and overcome the problem of poor ductility and toughness at ambient temperatures. In this paper, Ti2AlC/Ti-44Al-6Nb-0. 3Y composite was prepared successfully by spark plasma sintering (SPS) from 1000 to 1200T: .using element Ti, Al,Nb,Y and carbon nanotube(CNT) as parent materials. The phase constitution, microstructure and mechanical properties of TizAlC/Ti-44Al-6Nb-0. 3Y bulk materials were investigated. Results showed that Ti2AlC/Ti44Al-6Nb-0. 3Y composite was composed of γ-TiAl,Ti2AlC and a little amount of α2-Ti3Al phases,and the microstructure exhibited interpenetrating network structure character. When the sintering temperature was llOOt ,the relative density of assintered bulk materials reached 98. 4％ ,and the compressive yield strength was higher than 1800MPa. With increasing the SPS temperature up to 1200℃ .the TiAl grains became significantly coarsened,leading to clearly reduced mechanical properties.
TiAl composite microstructure mechanical properties spark plasma sintering
Fei Yang Yixiang Cai Yuyong Chen Fantao Kong
Department of Powder Metallurgy, Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 51065 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 ,P. R. Ch
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
1457-1459
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）