抄録
The microstructure stability of 4th generation single crystal superalloy, PWA 1497, during high temperature creep testing is discussed and compared with 2nd generation single crystal PWA 1484 superalloy. Quantitative scanning- and transmission electron microscopy methods are used to characterize the alloy microstructure and its changes during creep deformation at 980°C, especially the formation and subsequent directional coarsening of γ′ precipitates. The results show that the rafting parameter R is a suitable and reliable quantitative measure of the developed rafting.
