Atom probe tomography of secondary gamma %26apos; precipitation in a single crystal Ni-based superalloy after isothermal aging at 1100 degrees C

作者：Tan X P^*; Mangelinck D; Perrin Pellegrino C; Rougier L; Gandin Ch A; Jacot A; Ponsen D; Jaquet V

来源：Journal of Alloys and Compounds, 2014, 611: 389-394.

DOI：10.1016/j.jallcom.2014.05.132

• High-temperature alloys
• Atom probe tomography
• Precipitation
• Composition fluctuations

Secondary gamma%26apos; precipitation in a commercial single crystal Ni-based superalloy after the 1100 degrees C isothermal aging has been investigated by atom probe tomography. After the isothermal aging for 300 s, 1800 s and 3600 s, a bimodal size distribution of larger primary gamma%26apos; precipitates and numerous smaller secondary gamma%26apos; precipitates was obtained. It is proposed that the secondary gamma%26apos; precipitated via a non-classical nucleation mode. The coarsening of secondary gamma%26apos; precipitates well obeys the classical LSW theory.

• 出版日期2014-10-25
• 单位南阳理工学院; Mines Paristech