Macro-microscopic morphology and phase analysis of TiAl-based alloys sheet fabricated by EB-PVD method

来源期刊：中国有色金属学报(英文版)2007年第4期

论文作者：章德铭 陈贵清 韩杰才 张幸红 姚振中

文章页码：777 - 777

Key words：TiAl-based alloy; electron beam-physical vapor deposition; sheet; morphology; phase analysis

Abstract: TiAl-based alloys sheet with thickness of 0.3-0.4 mm as well as dimension of 150 mm×100 mm was fabricated successfully by using electron beam-physical vapor deposition(EB-PVD) method. The microscopic morphology and phase composition of specimens in various states were analyzed by atomic force microscope(AFM), scanning electron microscope(SEM) and X-ray diffractometer(XRD), respectively. The results indicate that the as-deposited TiAl-based alloys sheet has good surface quality and is composed of γ, α₂ and τ phase. There is natural delamination inside the sheet, of which the microstructure is columnar crystal, and the component shows a gradient change along the normal direction of substrate. After the vacuum hot pressing treatment and subsequent homogenization treatment, the columnar crystal transforms into the coarse fully lamellar microstructure, the delamination phenomenon and τ phase disappear, α₂ phase decreases obviously, and the composition tends to uniformization.

基金信息：the National Natural Science Foundation of China