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

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• 作者：Beining Du¹ ; ² ; ³ ; Zhiwu Shi¹ ; Jinxia Yang¹ ; Zhaokuang Chu¹ ; Chuanyong Cui¹ ; ^{chycui@imr.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaofeng Sun¹ ; Liyuan Sheng² ; ³ ; Yufeng Zheng² ; ³
• 关键词：Nickel superalloy ; Grain boundaries ; Boride ; Crystal structure ; Intergrowth ; Orientation relationship
• 刊名：Journal of Materials Science & Technology
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：32
• 期：3
• 页码：265-270
• 全文大小：1962 K

文摘

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.