Novel casting TiAl alloy with fine microstructure and excellent performance assisted by ultrasonic melt treatment

作者：Zheng Deshuang^*; Chen Ruirun^*; Wang Jian; Ma Tengfei; Ding Hongsheng; Su Yanqing; Guo Jingjie; Fu Hengzhi

来源：Materials Letters, 2017, 200: 67-70.

DOI：10.1016/j.matlet.2017.04.102

• TiAl alloy
• Cast
• Ultrasonic melt treatment
• Microstructure
• Mechanical performance

A novel casting TiAl alloy with fine homogeneous microstructure and excellent performances is obtained assisted by the ultrasonic melt treatment. The coarse columnar crystal is modified into non-dendritic structure and the large grain is refined from 3098 pm to 88 jam; the micro-segregation, micro-porosities and precipitates are eliminated as well. After ultrasonic melt treatment for 90 s, the highest compressive strength is improved up to 1705 MPa, about 12% higher than the "quasi-oriented" TiAl alloy.

• 出版日期2017-8-1
• 单位哈尔滨工业大学