Oxygen changes crack modes of Ni-based single crystal superalloy. Issue 12 (2nd December 2021)

• Record Type: Journal Article
• Authors: Li, Xueqiao; Liu, Yinong; Zhao, Yunsong; Chen, Yanhui; Li, Ang; Zhang, Jianfei; Zhai, Yadi; Li, Zhipeng; Ma, Dongfeng; Li, Xiaochen; Zhang, Qing; Yang, Xiaomeng; Long, Haibo; Mao, Shengcheng; Zhang, Ze; Han, Xiaodong
• Is Part Of: Materials research letters. Volume 9:Issue 12(2021)
• Page Start: 531
• Page End: 539
• Publication Date: 2021-12-02
• Subjects: Ni-based superalloys -- oxidation -- environment-assisted cracking -- in-situ transmission electron microscopy; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2021.1993367
• Languages: English
• ISSNs: 2166-3831

Abstract

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. GRAPHICAL ABSTRACT: UF0001 IMPACT STATEMENT: This paper firstly time provides direct in-situ oxygen-affected cracking behavior.