The Atomic Segregation and Ordered Stacking Fault Phase Transformation Along the Superlattice Stacking Fault During Creep in a Novel Powder Metallurgy Ni-Based Superalloy

被引：0
作者：
Li, Xinyu [1 ,2 ,3 ]
Zhang, Haopeng [2 ,3 ]
Li, Xiaokun [2 ,3 ]
Jia, Jian [2 ,3 ]
Liu, Changsheng [1 ]
Liu, Jiantao [2 ,3 ]
Zhang, Yiwen [2 ,3 ]
机构：
[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China
[2] Cent Iron & Steel Res Inst, High Temp Mat Res Inst, Beijing 100081, Peoples R China
[3] Gaona Aero Mat Co Ltd, Beijing 100081, Peoples R China
来源：
ADVANCED ENGINEERING MATERIALS | 2025年
关键词：
creeps; powder metallurgy Ni-based superalloys; segregations; superlattice stacking faults; INTERMEDIATE TEMPERATURES; DISLOCATIONS; STRENGTH;
D O I：
10.1002/adem.202401530
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Superlattice stacking faults (SSFs) in the gamma ' precipitate of a novel powder metallurgy (PM) Ni-based superalloy after creep rupture at 760 degrees C/552 MPa are analyzed through atomic-level characterization. The results show that the Cottrell atmosphere formed by the segregation of gamma formers Cr, Co, and Mo near the leading partial dislocation drives the extension of SSFs. Co, Cr, Mo, and W segregate along the superlattice intrinsic stacking fault and lead to the formation of the ordered stacking fault phase epsilon-D0(19). Meanwhile, Co, Ti, W, and Nb segregate along the superlattice extrinsic stacking fault and promote the formation of the ordered phase eta-D0(24). In addition, the formation process diagram of the SSF with ordered phase under the aid of segregation is drawn. The transformation of the ordered stacking fault phase can be evaluated by the atomic ratios of Al over the stacking fault phase formers.
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页数：7
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