Effect of alloying elements on stacking fault energies of γ and γ' phases in Ni-based superalloy calculated by first principles

被引:64
作者
Yang, Wenchao [1 ]
Qu, Pengfei [1 ]
Sun, Jiachen [1 ]
Yue, Quanzhao [1 ]
Su, Haijun [1 ]
Zhang, Jun [1 ]
Liu, Lin [1 ]
机构
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
基金
中国国家自然科学基金;
关键词
Ni-based single crystal superalloys; First principles; Stacking fault energy; Alloying element; Creep; SINGLE-CRYSTAL SUPERALLOY; CO CONTENT; CREEP; ENERGETICS; BEHAVIORS; SHEARING;
D O I
10.1016/j.vacuum.2020.109682
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The first-principle calculations were employed to investigate the effect of alloying elements on stacking fault energies of gamma-Ni and gamma'-Ni3Al phases in Ni-based single crystal superalloys. The results showed that Co, Cr, Mo, Ta, Ti, W, Re and Ru elements decreased the stacking fault energy of gamma-Ni phase with increasing the concentration, but increased the stacking fault energy of gamma'-Ni3Al phase except Co and Cr elements. And, Co had a more significant effect than Cr in decreasing the unstable stacking fault energies of two phases. Furthermore, the interaction effect of Co and Cr elements was calculated that it significantly reduced the stable stacking fault energy of gamma' phase but had no obvious effect on the that of gamma phase. Finally, two alloys with different Co contents were crept at 750 degrees C/750 MPa condition, and the creep life in 12Co alloy was about 118 h, which was basically half of that in 9Co alloy (242 h). The microstructure observation indicated that the width of stacking fault in gamma' phase in 12Co alloy was increased by 51.8 nm, and the stable stacking faults energy of gamma' phase was reduced by 9.1 mJ/m(2) compared to those in 9Co alloy.
引用
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页数:7
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