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Allvac 718Plus高温合金第二相演变与性能研究进展
唐丽婷, 郭倩颖, 李冲, 丁然, 刘永长

Advances in Secondary Phase Evolution and Performance Enhancement of Allvac 718Plus Superalloy
TANG Liting, GUO Qianying, LI Chong, DING Ran, LIU Yongchang
表1 Allvac 718Plus高温合金主要相的晶体结构及组成[4,18~22]
Table 1 Crystal structures and compositions of main phases in Allvac 718Plus alloy[4,18-22]
PhaseFormulaCrystal structureLattice constant (a, b, c)
γ-fcc (A1)a = 0.377 nm
γ′Ni3(Al, Ti)fcc (L12)a = 0.379 nm
γ″Ni3Nbbct (D022)a = 0.391 nm (c / a = 1.99)
ηNi3Nb0.5(Ti, Al)0.5Hexagonal (D024)a = 0.512 nm, c = 0.836 nm
δNi3NbOrthogonal (D0a)a = 0.514 nm, b = 0.423 nm, c = 0.453 nm
MX(Nb, Ti)(C, N)fcc (B1)a = 0.443-0.444 nm
C14 Laves(Ni, Cr, Fe)2(Nb, Mo, Ti)Hexagonal (D024)a = 0.88 nm, c = 0.45 nm
σ(Fe, Ni)CrTetragonal (D144h)a = 0.49 nm, c = 0.78 nm