【摘 要】
：
It has been recently pointed out that the compositions of industrial alloys are originated from cluster-plus-glueatom structure units in solid solutions.Specifically for Ni-based superalloys,after properly grouping the alloying elements into Al,Ni-like (N
【机 构】
：
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams(Dalian University of Techn
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It has been recently pointed out that the compositions of industrial alloys are originated from cluster-plus-glueatom structure units in solid solutions.Specifically for Ni-based superalloys,after properly grouping the alloying elements into Al,Ni-like (N(Ni)),γ\'-forming Cr-like ((Cr)γ\') and γ-forming Cr-like ((Cr)γ\'),the optimal formula for single-crystal superalloys is established [Al-(Ni)12](Al1(Cr)γ\'0.5(Cr)γ1.5).The Co substitutions for Ni at the shell sites are conducted on the basis of the first-generation single-crystal superalloy AM3,formulated as [Al-Ni12-xCox](Al1Ti0.25Ta0.25Cr1W0.25Mo0.25),with x =1.5,1.75,2 and 2.5 (the corresponding weight percents of Co are 9.43,11.0,12.57 and 15.71,respectively).The 900 ℃ long-term aging follows the Lifshitz-Slyozov-Wagner theory (LSW theory),and the Co content does not have noticeable influence on the coarsening rate of γ\'.The microstructure and creep behavior of the four (001) single-crystal alloys are investigated.The creep rupture lifetime is reduced as Co increases.The alloy with the lowest Co (9.43 Co) shows the longest lifetime of about 350 h at 1050 ℃/120 MPa,and all the samples show N-type rafting after creep tests.
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