Strengthening of an L12-ordered γ′-intermetallic by disordered γ-particles. Part I: Computer simulations

Creep strengthening of Ni3(Al, Si) intermetallic alloy by ductile precipitates

“…This pinning mechanism causes hardening of the alloy, in constant strain rate tests [5] as well as in the present creep tests. This is in agreement with the experimental work on a (Ni, Co) 3 (Al, Ti) alloy and the computer simulations of Nembach and his students [17,[32][33][34] who considered the interaction of superdislocations in the g 0 matrix with spherical g precipitates. The maximum resolved shear stress needed by the superdislocations to pass through the g precipitates is about 40-50% of the critical resolved shear stress [17,34].…”

Discrete dislocation simulations of precipitation hardening in inverse superalloys

“…Recent computer simulations, using an accurate line tension approximation (taking account of dislocation character and dissociation) for the dislocations and applied to the precipitation strengthening of an ordered 0 alloy by low volume fraction, small precipitate size, disordered , have been carried out [5][6][7]. Their results are in good agreement with the Friedel equation [8].…”

Variations in overall- and phase-hardness of a new Ni-based superalloy during isothermal aging

“…(2) and (3), the value of b, APB , G, and T should be known; In present study, b and APB were taken as 0.254 nm and 0.28 J m −2 , respectively [15]. The shear modulus G [=0.5E/(1 + )] was calculated using elastic modulus E = 221 GPa (of Inconel 740) and Poisson's ratio = 0.35 [16], and T was estimated as 0.5Gb 2 [7]. Although the cutting mechanism is known to be pre-dominant mechanism for the precipitation strengthening in a superalloy, previous works [14] reported that, in a limited condition (e.g., for large precipitates in an overaged condition), precipitation strengthening of superalloys can be also controlled by Orowan mechanism.…”