Internal Stresses, Coherency Strains and Local Lattice Parameter Changes in a Creep-Deformed Monocrystalline Nickel-Base Superalloy

1993 ◽  
Vol 12 (1-2) ◽  
pp. 21-30 ◽  
Author(s):  
H. Biermann, ◽  
H.-A. Kuhn, ◽  
Τ. Ungár, ◽  
J. Hammer, ◽  
H. Mughrabi,
Keyword(s):  
Lattice Parameter ◽  
Internal Stresses ◽  
Nickel Base Superalloy ◽  
Local Lattice ◽  
Nickel Base ◽  
Coherency Strains ◽  
Base Superalloy

Coherent Interface Contrast in a Nickel Base Alloy

1967 ◽  
Vol 25 ◽  
pp. 308-309
Author(s):  
J. M. Oblak ◽  
B. H. Kear
Keyword(s):  
Small Difference ◽  
Base Alloy ◽  
Lattice Parameter ◽  
Tetragonal Distortion ◽  
Nickel Base Superalloy ◽  
Nickel Base Alloy ◽  
Fringe Contrast ◽  
Coherent Interface ◽  
Nickel Base ◽  
Base Superalloy

During an investigation of recrystallization in the γ′ precipitation hardened nickel-base superalloy Udimet 700 many examples were found of fringe contrast at coherent matrix-γ′ interfaces. The properties of the fringes are those characteristic of so-called “δ-fringes”, as discussed by Gevers et al. A similar phenomenon has been observed in Ni-6.71 wt. % Al, and related to the formation of δ fringes by a tetragonal distortion of the γ matrix at the γ-γ′ interface. The interface fringes in Udimet 700 show surprisingly pronounced contrast despite the small difference in lattice parameter between γ and γ′ (<0.1% vs 0.5% in binary Ni-Al).

Creep Induced Evolution of Internal Stresses and Structure in a Singel Crystal Nickel-Base Superalloy

2000 ◽  
Vol 347-349 ◽  
pp. 363-367 ◽  
Author(s):  
Udo Brückner ◽  
Alexander Epishin ◽  
Thomas Link ◽  
Pedro D. Portella
Keyword(s):  
Internal Stresses ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy
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