Ti3AlC2 has the properties of ceramics and metals. These excellent properties indicate that Ti3AlC2 is a very promising material to extensive applications. Ti3AlC2 ceramic material was prepared by mechanical alloying....Ti3AlC2 has the properties of ceramics and metals. These excellent properties indicate that Ti3AlC2 is a very promising material to extensive applications. Ti3AlC2 ceramic material was prepared by mechanical alloying. The effects of milling time and sintering temperature on the fracture, microstmctttre and mechanical properties of Ti3AlC2 ceramic material were analyzed by laser particle analyzer, X-ray diffraction, and scanning electron microscopy. The experimental results showed that Ti3AlC2 had the best comprehensive properties after the composite powder was milled for 3 h and sintered at 1630℃ for 2 h. The relative density, bending strength, and hardness of the sample reached 92.23%, 345.2 MPa, and HRA 34.1, respectively. The fracture surface indicated that the fracture of the material belonged to ductile rapture.展开更多
In this study, vacuum atmosphere. The diffusion bonding of TiAI alloy and Ti3AlC2 ceramic was carried out using Ni foil as interlayer in a interfacial microstructures and the mechanical properties of the diffusion bon...In this study, vacuum atmosphere. The diffusion bonding of TiAI alloy and Ti3AlC2 ceramic was carried out using Ni foil as interlayer in a interfacial microstructures and the mechanical properties of the diffusion bonded joints were evaluated. Result showed that the interfacial microstructure of the joint from TiAl to Ti3AlC2 side could be divided into Al3NiTi2 , AlNi2 Ti , Ni3 （ Al, Ti） , Ni , Ni3 （ Al , Ti） , Ni （ Al , Ti ） , Ni3Al ＋ TiC~ ＋ Ti3AlC2 , respectively. The shear strength test showed that an average value of 45.9 MPa was achieved. The crack propagated along the interface between TiAl intermetallic and Ni interlayer during the shear test. The mechanisms f or formation of those compound layers during bonding process and the determinant of the fracture location were also discussed.展开更多
文摘Ti3AlC2 has the properties of ceramics and metals. These excellent properties indicate that Ti3AlC2 is a very promising material to extensive applications. Ti3AlC2 ceramic material was prepared by mechanical alloying. The effects of milling time and sintering temperature on the fracture, microstmctttre and mechanical properties of Ti3AlC2 ceramic material were analyzed by laser particle analyzer, X-ray diffraction, and scanning electron microscopy. The experimental results showed that Ti3AlC2 had the best comprehensive properties after the composite powder was milled for 3 h and sintered at 1630℃ for 2 h. The relative density, bending strength, and hardness of the sample reached 92.23%, 345.2 MPa, and HRA 34.1, respectively. The fracture surface indicated that the fracture of the material belonged to ductile rapture.
基金This work was supported by the National Basic Research Program of China （2011CB605505） and the National Natural Science Foundation of China under Grant No. 51021002 and No. 51275133.
文摘In this study, vacuum atmosphere. The diffusion bonding of TiAI alloy and Ti3AlC2 ceramic was carried out using Ni foil as interlayer in a interfacial microstructures and the mechanical properties of the diffusion bonded joints were evaluated. Result showed that the interfacial microstructure of the joint from TiAl to Ti3AlC2 side could be divided into Al3NiTi2 , AlNi2 Ti , Ni3 （ Al, Ti） , Ni , Ni3 （ Al , Ti） , Ni （ Al , Ti ） , Ni3Al ＋ TiC~ ＋ Ti3AlC2 , respectively. The shear strength test showed that an average value of 45.9 MPa was achieved. The crack propagated along the interface between TiAl intermetallic and Ni interlayer during the shear test. The mechanisms f or formation of those compound layers during bonding process and the determinant of the fracture location were also discussed.
