镍基高温合金微孪晶形成机制的研究进展

doi:10.11896/cldb.18120160

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Abstract Ni-based single crystal superalloys have long been the candidate materials for applications in the critical components of the gas turbine engines due to their superior composition compatibility, microstructural stability, and creep, fatigue, oxidation, corrosion resistances. The inhibition of dislocation motion by γ′ precipitates is one of the main strengthening effects of nickel-based superalloys. In general, this hindrance is related not only to the morphology, volume fraction and size of γ′ precipitates, but also to the interaction of γ′ precipitates and dislocation. Usually this inte-raction mechanism can be divided into three types: shearing mechanism, Orowan looping mechanism and thermal activation climbing mechanism. When different types of dislocations cut the γ′ phase, different high-energy defects are formed in the γ′ phase, which can hinder creep and fatigue. Examples of these structural and chemical defects include antiphase boundaries (APB), complex stacking faults (CSF), superlattice intrinsic stacking faults (SISF), superlattice extrinsic stacking faults (SESF) and micro-twins.
Micro-twinning is an important deformation mechanism in nickel-based superalloys. It mainly occurs under medium-temperature and high-stress conditions. In addition, during the mid-temperature tensile deformation, micro twinning occurs. Early studies have shown that the appearance of micro-twins is related to the superlattice extrinsic stacking faults (SESF), which is produced by a/3〈112〉 superlattice partial dislocations and can be considered as “embryonic twin”. Subsequently, the reordering mechanism based on the short-range diffusion of solute atoms is used to explain the formation of micro-twins. Firstly, the a/6〈112〉 partial dislocation cut into the γ′ phase to produce complex stacking faults (CSF), and then the complex stacking faults are transformed to SESF by atomic rearrangement. Finally, micro-twins are eventually formed. Recent studies have shown that in the process of micro-twinning, the long-range diffusion of critical elements such as Cr and Co could occur under the collective effect of composition segregation and Cottrell atmospheres. Therefore, some scholars have pointed out that the formation of micro-twins require the long-range diffusion of critical elements, along with the short-range reordering. Moreover, some researchers are not limited to the study of forming mechanism of the micro-twin mechanism of superalloys, but have further understanding of the growth mechanism of micro-twin.
The coherent nano-twin boundaries, as a special defect in the metal material, can effectively hinder the dislocation motion and strengthen the material. And this strengthening method has been applied in nano-copper, TWIP steel and TiAl alloy. The researchers found that twins can strengthen solid solution-strengthened nickel alloys. At the same time, some scholars have given a clear TEM image, clearly indicating that the micro-twins hinder the movement of dislocations, and pointed out that the introduction of micro twins can be used as a new way to design and strengthen superalloys. Therefore, micro-twinning is expected to be a method of strengthening nickel-based superalloys.
In this paper, the development and evolution of micro-twin deformation mechanism are summarized, and the roles of partial dislocations, superlattice intrinsic stacking fault (SISF), superlattice extrinsic stacking faults (SESF), complex stacking faults (CSF), elemental segregation and Cottrell atmospheres are analyzed in micro-twinning, then also the role of the segregation at twin interface in twin growth is explained. Moreover, the role of twins in alloy strengthening is reviewed, and the problems existing in the strengthening of superalloys by micro-twinning are pointed out. Finally, the application of micro twins in reinforcing superalloys is prospected, and a reference is provided for the study of the deformation mechanism at medium-temperature and the twinned reinforced mechanism.

Key words： nickel-based superalloy deformation mechanism micro-twins element segregation twin strengthening

Published: 30 September 2019

CLC number:

TG115.5

Fund:This work was financially supported by the National Natural Science Foundation of China (51771148,51631008, 51690163), Natural Science Basic Research Plan in Shaanxi Province of China (2019JM-319), and Fundamental Research Funds for the Central Universities (3102018JCC009,3102019PB001).

About author:: Pengfei Qu received his B.S. degree in Materials Science from Central South University in 2016. He is currently pursuing his Ph.D. at State Key Laboratory of Solidification Processing, Northwestern Polytechnical University under the supervision of Asst. Prof. Wenchao Yang. His research has focused on the study of creep behaviors and mechanisms in Ni-based single crystal superalloys.
Wenchao Yang is an associate professor at the School of Materials, Northwestern Polytechnical University as the Ph.D. supervisor, and he is a member of the Electromagnetic Metallurgy Branch of the China Society for Metals and a member of Chinese Society of Aeronautics and Astronautics. Currently, he mainly focused on the solidification characteristics, orientation and defects controls, microstructure optimization, heat treatment process development, creep mechanism and properties of Ni-based single crystal superalloys. Dr. Wenchao Yang was enrolled the Third “Young Talents Lifting Project” of the China Association for Science and Technology (2017—2019) and won the First Prize of Shaanxi Science and Technology Invention Award in 2017 and F5000 China Excellent Academic Journal Top Paper Award in 2015. He hosted two National Natural Science Foundations, one Young Talents Entrustment Project of China Association for Science and Technology, one Shaanxi Natural Science Fund and one “Strong Foundation Project” of Ministry of Industry and Information Technology to promote the research and marketization process of high tempe-rature alloy. In addition, he was also authorized 6 national invention patents, published more than 50 SCI papers, and was invited to make 10 reports on the international conference.

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Cite this article:

QU Pengfei,YANG Wenchao,YUE Quanzhao, et al. The Research and Development of Micro-Twinning Formation Mechanism inNickel-based Superalloys[J]. Materials Reports, 2019, 33(23): 3971-3978.

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http://www.mater-rep.com/EN/10.11896/cldb.18120160 OR http://www.mater-rep.com/EN/Y2019/V33/I23/3971

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