Work

Creep properties and deformation mechanisms of two Nb-containing low-cost third-generation single crystal superalloys

Year: 2026

Type: article

Abstract: Two low-cost third-generation single crystal superalloys with varying Nb contents were valuated for creep properties at 1100 °C/137 MPa. The deformation mechanism of two Nb-containing superalloys was extensively analyzed by microstructure and dislocation configuration analysis. The creep tests revealed that the 1Nb alloy demonstrated significantly higher creep lives compared with the 0.5Nb alloy. During the primary creep stage, the 1Nb alloy exhibited narrower matrix channel width than the 0.5Nb alloy, which increased resistance to dislocation bowing. As creep progressed, the 1Nb alloy developed thicker γ′ rafts and smaller dislocation networks spacing compared with the 0.5Nb alloy, resulting in reduced dislocation climbing rate. Consequently, the 1Nb alloy exhibited an extended steady state creep stage. During the accelerated creep stage, the 1Nb alloy formed denser dislocation networks, effectively preventing superdislocations from cutting into γ′ phase. This comprehensive investigation of deformation mechanisms by microstructure evolution and dislocation configurations provides essential guidance for developing third-generation low-cost single crystal superalloys.

Source: Intermetallics

DOI: 10.1016/j.intermet.2026.109213

Authors: Feng Leng, Lirong Liu, Peisen Lv, Jian Zhang, Yunsong Zhao

Institutions: Shenyang University of Technology, Beijing Institute of Aeronautical Materials

Language: English

Topic: High Temperature Alloys and Creep

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,730

Funders: National Natural Science Foundation of China, National Key Research and Development Program of China