M5B3 Boride at the Grain Boundary of a Nickel-based Superalloy

doi:10.1016/j.jmst.2015.11.010

J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (3): 265-270.DOI: 10.1016/j.jmst.2015.11.010

M₅B₃ Boride at the Grain Boundary of a Nickel-based Superalloy

Beining Du^{1, 2, 3}, Zhiwu Shi¹, Jinxia Yang¹, Zhaokuang Chu¹, Chuanyong Cui¹, Xiaofeng Sun¹, Liyuan Sheng^{2, 3}, Yufeng Zheng^{2, 3}

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2 Peking University, Beijing 100871, China;
3 PKU-HKUST ShenZhen-Hong Kong Institution, Shenzhen 518057, China

Received:2015-01-19 Revised:2015-03-19 Online:2016-03-10
Contact: Prof.; Tel.: +86 24 83978292; Fax: +86 24 23971758.E-mail address: chycui@imr.ac.cn (C. Cui).
Supported by:
This work was partly supported by the High Technology Research and Development Program of China (No. 2014AA041701), the National Natural Science Foundation of China (Nos. 51171179, 51271174, 51331005, and 11332010), and China Postdoctoral Science Foundation under Grant No. 2015M580923.

Abstract

Abstract: The grain boundary microstructures of a heat-treated Ni-based cast superalloy IN792 were investigated. The results show that M₅B₃ boride precipitates at the grain boundary. A special orientation relationship between M₅B₃ phase and the matrix at one side of the grain boundary is found. At the same time, two M₅B₃ borides with different orientations could co-exist in a single M₅B₃ particle as an intergrowth besides existing alone, thus forming orientation relationship between the two M₅B₃ phases and matrix. This phenomenon could be attributed to the special orientation relationship between M₅B₃ phase and the matrix.

Key words: Nickel superalloy, Grain boundaries, Boride, Crystal structure, Intergrowth, Orientation relationship

Beining Du, Zhiwu Shi, Jinxia Yang, Zhaokuang Chu, Chuanyong Cui, Xiaofeng Sun, Liyuan Sheng, Yufeng Zheng. M₅B₃ Boride at the Grain Boundary of a Nickel-based Superalloy[J]. J. Mater. Sci. Technol., 2016, 32(3): 265-270.

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M₅B₃ Boride at the Grain Boundary of a Nickel-based Superalloy

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