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The Critical Resolved Shear Stress for Twinning in a Modern Single Crystal Ni-Based Superalloy TMS-82

Authors

  • Fei Sun,

    1. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan, Shandong Province, China
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  • Jianxin Zhang,

    Corresponding author
    1. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan, Shandong Province, China
    • Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, 17923 Jingshi Road, Jinan250061Shandong ProvinceChina

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  • Hiroshi Harada

    1. National Institute for Materials Science, Tsukuba, Ibaraki, Japan
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  • The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 50971078, No. 51071096 and No. 51271097), Shandong Province Natural Science Foundation (Grant No. ZR2010EM009), and China Postdoctoral Science Foundation (special grade, Grant No. 201003630).

Abstract

Detailed observations of the microstructural evolution were performed in single crystal superalloy TMS-82 after thermo-mechanical cycling. An interesting phenomenon shows that the area close to the fracture tends to create a lot of deformation twins, while the area far from the fracture exhibits few deformation twins. Theoretical calculations were further analyzed in an effort to clarify the critical resolved shear stress for twinning in single crystal superalloy by consideration of the special shearing mechanisms of twinning dislocations. The feature that a high density of deformation twins occurs in the area close to the fracture of superalloy TMS-82 due to the stress concentration.

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