【摘 要】
：
The TiAl-based alloys sheet with 150 mm×100 mm×0.4 mm and the TiAl/Nb laminated composites with 150 mm×100 mm×0.2 mm were fabricated by using electron beam-
【机 构】
：
Center for Composite Materials
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The TiAl-based alloys sheet with 150 mm×100 mm×0.4 mm and the TiAl/Nb laminated composites with 150 mm×100 mm×0.2 mm were fabricated by using electron beam-physical vapor deposition(EB-PVD) method,respectively. The microstructure and properties of the sheet were investigated by AFM,SEM and EDS. The results show that the TiAl based alloys sheet has a good surface quality,and its microstructure is columnar crystal. The component of the alloys indicates a regular and periodical gradient change which leads to the spontaneous delamination along the normal direction of substrate. In the TiAl/Nb laminated composites alternating overlaid by TiAl of 24 layers and Nb of 23 layers,the interface of each layer evenly distributed throughout the cross-section is transparent,and the interlayer spacing is about 8 ìm. The component of TiAl layers also changes regularly along the normal direction of substrate,but no delamination phenomenon is found. The TiAl/Nb laminated composites have better ductility than the TiAl-based alloys sheet.
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