Title of article :
Precipitation Behavior of the Topologically Close-Packed Phase inthe DD5 Superalloy during Long-Term Aging
Author/Authors :
Liu, Guiqun College of Material Science and Engineering - North Minzu University - Yinchuan 750021, China , Zhang, Xiaoli College of Material Science and Engineering - North Minzu University - Yinchuan 750021, China , Wang, Xinyi School of Materials Science and Engineering - Jiangsu University of Science and Technology - Zhenjiang 212003, China , Qiao, Yanxin School of Materials Science and Engineering - Jiangsu University of Science and Technology - Zhenjiang 212003, China
Abstract :
The precipitation behaviors of the topologically close-packed (TCP) phases in the bicrystal DD5 superalloy have been investigated.The results showed that the [001] crystallographic orientations are consistent with that of adjacent grains; however, the direction ofthe needle-like TCP phases is not consistent with that of theγphase channels. The angle between needle-like TCP phases andγphase channels is 45°, but the angle between the needle-like TCP phases of the adjacent grains is equal to the misorientation ofthe adjacent grains. Furthermore, during long-term aging, the needle-like TCP phases gradually decompose and transform intoglobular and short rod-like phases. The TCP phases precipitate preferentially in the dendrite. It is difficult to precipitate at theinterdendrite/grain boundary, which is caused by the segregation of the constituent elements of the TCP phase to the dendrite.
Keywords :
Precipitation Behavior , Topologically Close-Packed Phase , DD5 Superalloy during Long-Term Aging , TCP
