Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 31    No. 7    July 2021

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Impact of replacement of Re by W on dislocation slip mediated creeps of γ′-Ni3Al phases
Zhou YI, Yun-lei XU, Ping PENG, Jiang-hua CHEN

School of Materials Science and Engineering, Hunan University, Changsha 410082, China

Abstract:The anomalous flow behavior of γ′-Ni3Al phases at high temperature is closely related to the cross-slip of 1/2á110?{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 (τmax) in γ′-Ni3Al 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 1/6á112?{111} Shockley partial dislocations and promote the cross-slip of 1/2á110?{111} super-partial dislocations. With the replacement of a part of Re by W, a decreased indicates that the anomalous flow behavior of γ′ phases at high temperature is not as excellent as the double Re-addition, but an increased τmax 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 W at Al-Al sites. As the interaction between X1Al and X2Al point defects is characterized by an correlation energy function , it is found that both strong attraction and strong repulsion are unfavarable for the improvement of yield strengths of γ′ phase.

 

Key words: Ni-based single crystal superalloy; γ′-Ni3Al; generalized stacking fault energy; ideal shear strength; dislocation; cross-slip

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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