Boride-induced dislocation channeling in a single crystal Ni-based superalloy

被引：15

作者：

Ge, H. L. ^{[1
,2
]}

Liu, J. D. ^{[3
]}

Zheng, S. J. ^{[1
]}

Zhou, Y. T. ^{[1
]}

Jin, Q. Q. ^{[1
]}

Shao, X. H. ^{[1
]}

Zhang, B. ^{[1
]}

Zhou, Y. Z. ^{[3
]}

Ma, X. L. ^{[1
,4
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China

[3] Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Liaoning, Peoples R China

[4] Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China

来源：

MATERIALS LETTERS | 2019年 / 235卷

基金：

中国国家自然科学基金;

关键词：

Ni-based superalloy; Creep; Boride; Dislocation; Interface; HIGH-TEMPERATURE CREEP; LOW-STRESS CREEP; BIMETAL INTERFACES; PHASE; SOLIDIFICATION; DEFORMATION; MECHANISMS; ADDITIONS; BEHAVIOR; FRACTURE;

D O I：

10.1016/j.matlet.2018.10.039

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Generally, minor elements such as carbon and boron are added in superalloys to strengthen grain boundaries. However, effects of carbon and boron on single crystal superalloys remain disputed. Here we demonstrate that M23B6 (where M is mixture of W, Mo, Cr and Ni) can induce dislocation channeling in a Ni-based single crystal superalloy. The M23B6 has a cube-on-cube orientation relationship with the matrix, forming a majority of {1 1 1} plane interfaces. Furthermore, the atomic stepped {1 1 1} interface could facilitate dislocation nucleation. Dislocations emitted from the interface glide forward and pile-up in the channel, resulting in strain localization and creep micro-crack initiation. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：232 / 235

页数：4