Determination and Influencing Factors of the Primary Phase in Directionally Solidified TiAl Alloys

作者：Liu Tong; Luo Liangshun; Wang Liang; Li Xinzhong; Chen Ruirun; Su Yanqing^*; Guo Jingjie; Fu Hengzhi

来源：Rare Metal Materials and Engineering, 2017, 46(9): 2737-2743.

• TiAl alloys
• directional solidification
• primary phase
• growth direction
• preferred orientation

gamma-TiAl alloys are potentially used as high-temperature structural materials with a high specific strength and low density. The mechanical properties of gamma-TiAl alloys are extremely anisotropic with respect to the lamellar orientation of the microstructures. A balance combination of room-temperature ductility and strength can be achieved when the lamellar orientation are aligned parallel to the growth direction. The lamellar orientation can be aligned by a directional solidification technique. However, the orientation of the primary phase has great influence on room temperature lamellar orientation. This paper reviewed the research progress of the primary phase growth direction in directionally solidified TiAl alloys, the method for determining the orientation of primary high temperature phase and effects of solidification conditions and interface on the growth direction of primary phase are presented. Finally, the future research direction was summarized.

• 出版日期2017-9
• 单位哈尔滨工业大学