γ′ 相的尺寸梯度对镍钴基高温合金变形机制的影响

γ′ 相的尺寸梯度对镍钴基高温合金变形机制的影响

齐东卿，赵  鹏，崔传勇，叶恒强，杜  奎^*

(1.中国科学院金属研究所 沈阳材料科学国家研究中心，辽宁 沈阳 110016；2. 山东大学 化学与化工学院，山东 济南 250100；3.季华实验室，广东佛山528000)

摘 要 本文借助像差校正透射电子显微镜研究了富钴镍基高温合金高温拉伸变形过程中不同尺度的γ′相对合金变形机制的影响。研究发现，随着γ′相尺寸的增加，基体位错以位错对的方式切割γ′相逐渐转变为以Orowan机制绕过γ′相，并在其周围形成位错环，而以层错和微孪晶为主导的变形方式均可切入γ′相，并进一步在基体中运动。同时发现，层错之间的交互作用能够促使内禀层错转变为外禀层错并可逐步增加错排片层数量，最终演变为可剪切所有尺寸γ′相的变形孪晶。γ′相的尺寸效应以及层错转变为孪晶的过程有利于对后续合金设计提供理论参考。

关键词  富钴镍基高温合金；γ′相；位错；层错；孪晶

中图分类号：TG132.3⁺ 2; O77⁺ 2; V414.3⁺ 2; O77；TG115.21⁺5.3 

文献标识码：A    doi:10.3969/j.issn.1000-6281.2022.05.004

Size gradient of γ′ phase effect on deformation mechanism of nickel-cobalt-based superalloys

QI Dong-qing^1，2，ZHAO Peng¹，CUI Chuan-yong¹，YE Heng-qiang^1，3，DU Kui^{1 *}

(1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016; 2. School of Chemistry Engineering, Shandong University, Jinan Shandong 250100; 3. Ji Hua Laboratory, Foshan Guangdong 528000, China)

Abstract  The deformation mechanism of γ′ phase at different scales during high temperature tensile deformation of cobalt-rich nickel-based superalloys are studied by aberration-corrected electron microscopy. With the increase of the size of the γ' phase, the matrix dislocations cut the γ' phase in the manner of dislocation pairs and gradually transformed into bypassing the γ' phase by the Orowan bypass mechanism, and formed dislocation loops around it, while stacking faults and micro-twins cut into the γ' phase and further move in the matrix. It is also found that the interaction between stacking faults can promote the transformation of intrinsic stacking faults into extrinsic stacking faults and gradually increase the number of staggered sheets, and finally evolve into deformation twins that can shear all sizes of γ' phases. The size effect of γ' phase and the process of stacking faults transforming into twins, which is beneficial to the subsequent alloy design. 

Keywords   nickel-cobalt-based superalloy；γ′phase；dislocation；stacking fault；twin

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