Intergrowth of C phase within μ phase in a Re-containing Ni-base single crystal superalloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第5期
论文作者：Shuang Gao Yizhou Zhou Zhi-Quan Liu Tao Jin
文章页码：806 - 810
摘 要：Precipitation of topologically close-packed phases in a Re-containing Ni-base single crystal superalloy was studied under elevated temperature by in situ transmission electron microscopy.Above 1150?C,a new intergrowth structure called C phase was found within μ phase with a defined crystallographic orientation relationship.Elements mapping analysis reveals that C phase has a similar element composition as μ phase,but contains a lower level of Cr,W and Re.With increasing temperature,the proportion of C phase increases gradually.At 1250?C,C phase becomes the dominant precipitate.It is demonstrated that C phase is more thermodynamically stable than μ phase above 1150?C that leads to an intergrowth pathway from μ phase to C phase.
Shuang Gao1,2，Yizhou Zhou1，Zhi-Quan Liu1，Tao Jin1
1. Institute of Metal Research,Chinese Academy of Sciences2. Division of Energy and Environment,Graduate School at Shenzhen,Tsinghua University
摘 要：Precipitation of topologically close-packed phases in a Re-containing Ni-base single crystal superalloy was studied under elevated temperature by in situ transmission electron microscopy.Above 1150?C,a new intergrowth structure called C phase was found within μ phase with a defined crystallographic orientation relationship.Elements mapping analysis reveals that C phase has a similar element composition as μ phase,but contains a lower level of Cr,W and Re.With increasing temperature,the proportion of C phase increases gradually.At 1250?C,C phase becomes the dominant precipitate.It is demonstrated that C phase is more thermodynamically stable than μ phase above 1150?C that leads to an intergrowth pathway from μ phase to C phase.
关键词：
