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Impact of replacement of Re by W on dislocation slip mediated creeps of γ′-Ni3Al phases by Zhou YI; Yun-lei XU; Ping PENG; Jiang-hua CHEN is a Engineering article available to read on EtoBox.

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The anomalous flow behavior of γ′-Ni 3 Al phases at high temperature is closely related to the cross-slip of 1/2110{111} super-partial dislocations. Generalized stacking fault energy curves (i.e., Γ-surfaces) along the lowest energy path can provide a great deal of information on the nucleation and movement of dislocations. With the first-principles calculation, the interplay between Re and W, Mo, Ta, Ti doped at preferential sites and their synergetic influence on Γ-surfaces and ideal shear strength (τ max ) in γ′-Ni 3 Al phases are investigated. Similar to single Re-addition, the Suzuki segregation of W at stacking faults is demonstrated to enable to impede the movement of 1/6112{111} Shockley partial dislocations and promote the cross-slip of 1/2110{111} super-partial dislocations. With the replacement of a part of Re by W, a decreased 111 001 APB APB / γ γ indicates that the anomalous flow behavior of γ′ phases at high temperature is not as excellent as the double Re-addition, but an increased τ max means that the creep rupture strength of Ni-based single crystal superalloys can be benefited from this replacement to some extent, especially in the co-segregation of Re and

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Author

Zhou YI; Yun-lei XU; Ping PENG; Jiang-hua CHEN

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Engineering (Physical Sciences)