1. Oxygen changes crack modes of Ni-based single crystal superalloy
- Author
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Yanhui Chen, Zhipeng Li, Zhai Yadi, Yunsong Zhao, Ang Li, Xiaomeng Yang, Shengcheng Mao, Zhang Qing, Yong Liu, Li Xiaochen, Ma Dongfeng, Zhang Jianfei, Haibo Long, Xueqiao Li, Ze Zhang, and Xiaodong Han
- Subjects
010302 applied physics ,Materials science ,oxidation ,in-situ transmission electron microscopy ,chemistry.chemical_element ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Oxygen ,In situ transmission electron microscopy ,Cracking ,environment-assisted cracking ,chemistry ,0103 physical sciences ,Oxidizing agent ,TA401-492 ,General Materials Science ,Composite material ,0210 nano-technology ,Materials of engineering and construction. Mechanics of materials ,Single crystal superalloy ,ni-based superalloys - Abstract
Oxygen-affected cracking commonly presents on thin Ni-based single crystal superalloy components serving in high temperature and oxidizing environments. This study uses a newly developed in-situ thermal-stress environmental transmission electron microscope to investigate the oxidation and fracture behaviors of Ni-based single crystal superalloy at 650°C under stress. The in-situ oxidation was found to change the tensile fracture mode from the close-packed {111} planes of plastic fracture to $ \{001\} $ planes adjacent to γ/γ′ interfaces of brittle fracture. The microanalysis also revealed that the γ′ cuboids, γ phase, and γ/γ interface exhibit different oxidation behavior, thus underscoring the thickness debit effect.
- Published
- 2021