Coarsening Behavior of Gamma Prime Precipitates in a Nickel Based Single Crystal Superalloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2016年第2期
论文作者：S.Tang L.K.Ning T.Z.Xin Z.Zheng
文章页码：172 - 176
摘 要：The γ/γ’ microstructural evolution in a nickel based single crystal superalloy during load-free thermal exposure at 900 ℃ has been further investigated in this paper.The growth characteristics of γ’ precipitates were discussed in detail.The generation of interfacial dislocations would accelerate the rate of coalescence in the dendrite arms.The average sizes of precipitates were used to compare interface with diffusion controlled growth mechanism and no mechanism seems obviously dominant,although the square rate law gives slightly better fit.The coarsening behavior may be controlled by diffusion through the ragged interface between the γ’ precipitate and the γ matrix.
S.Tang1,2，L.K.Ning1,2，T.Z.Xin1,2，Z.Zheng2
1. University of Chinese Academy of Sciences2. Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences
摘 要：The γ/γ’ microstructural evolution in a nickel based single crystal superalloy during load-free thermal exposure at 900 ℃ has been further investigated in this paper.The growth characteristics of γ’ precipitates were discussed in detail.The generation of interfacial dislocations would accelerate the rate of coalescence in the dendrite arms.The average sizes of precipitates were used to compare interface with diffusion controlled growth mechanism and no mechanism seems obviously dominant,although the square rate law gives slightly better fit.The coarsening behavior may be controlled by diffusion through the ragged interface between the γ’ precipitate and the γ matrix.
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