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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Preparation of Ti-Al alloy sheet by
electron beam physical vapor deposition
MA Li(马 李), HE Xiao-dong(赫晓东), SUN Yue(孙 跃)

Center for Composite Material, Harbin Institute of Technology, Harbin 150001, China

Abstract:Ti-Al thin sheet with dimension of 450 mm×450 mm×0.2 mm was prepared by electron beam physical vapor deposition(EB-PVD) technology. The surface and cross-section pattern of as-deposited sample were studied by SEM and AFM, and then the composition and phase were analysed by XRD and EPMA. Finally, the effect on deposit by re-evaporation of Al was explored by calculating the ratio of re-evaporating capacity with depositing capacity of Al on the substrate. The results indicate that the evaporation process with Nb addition into the molten pool makes it earlier to reach the steady-state. The existing equiaxed crystal and columnar crystal along the cross-sectional may be caused by the transformation latent heat released during the transition course of atoms from gaseous state to solid state. The effect on deposit by re-evaporation of Al can be neglected because the re-evaporating capacity of Al is far below that of the depositing capacity.

 

Key words: electron beam physical vapor deposition; Ti-Al thin sheet; microstructure; saturation vapor pressure; re-evaporation

ISSN 1672-7029
CN 43-1423/U

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