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Taotao Ai,Ning Yu,Xiaoming Feng,Niansuo Xie,Wenhu Li,Pengju Xia 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.1
Ti2AlC/TiAl in situ composites were fabricated via a reaction Hot-Pressing Process using Ti3AlC2, Ti, and Alpowders as initial materials. The effect of Ti2AlC content on the phases and microstructure of the as-sinteredcomposites was investigated by XRD and SEM. The mechanical properties such as Vickers hardness, flexuralstrength and fracture toughness of the as-sintered composites were also tested. The products consisted ofTi2AlC, γ-TiAl and α2-Ti3Al as the major phases. Ti2AlC reinforcements were mainly distributed in the grainboundaries, resulting in obvious γ+α2 grain refinement. With increasing Ti3AlC2 content (up to 5 wt%), theVickers hardness, flexural strength and fracture toughness of the as-sintered composite reached the maximumvalues of 3.7 GPa, 651.5 MPa, and 10.89 MPa·m1/2, respectively. Analysis of fracture surface and crackpropagation paths indicated that crack deflection and crack bridging of the in situ precipitated Ti2AlC phasesobtained by decomposing Ti3AlC2 were the main reasons for the observed composite toughening.
Qiliang Wang,Qi Yu,Junsong Liu,Taotao Ai,Hongdong Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.6
Zinc oxide (ZnO) nanorods (NRs) have been synthesized as a template to fabricate TiO2 nanotubes (TiNTs) on hemispherical diamond film by liquid-phase deposition (LPD) method. The process concerning the formation of TiNTs was analyzed. Based on the results of XRD and Raman spectroscopy, it is demonstrated that TiNTs was successfully obtained after removing ZnO NRs by chemical etching at room temperature. The TiNTs on hemispherical diamond film show higher performance photocatalysis, examined by the degradation of the reactive yellow 15(RY15) solution. The corresponding mechanism is discussed.