Atomic arrangement and formation of planar defects in the μ phase of Ni-base single crystal superalloys

Shiyu Ma; Xueqiao Li; Jianxin Zhang; Jide Liu; Pan Li; Youjian Zhang; Huixin Jin; Wenyang Zhang; Yizhou Zhou; Xiaofeng Sun; Qing Zhang; Yanhui Chen; Shengcheng Mao

doi:10.1016/j.jallcom.2018.07.035

Atomic arrangement and formation of planar defects in the μ phase of Ni-base single crystal superalloys

Shiyu Ma, Xueqiao Li, Jianxin Zhang^*, Jide Liu, Pan Li, Youjian Zhang, Huixin Jin, Wenyang Zhang, Yizhou Zhou, Xiaofeng Sun, Qing Zhang, Yanhui Chen, Shengcheng Mao

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The internal characteristics of the μ phase in Ni-base single crystal superalloys aged at 1100 °C for 1000 h were investigated via spherical aberration-corrected transmission electron microscopy. There were a large number of planar defects on the (001) plane at the growth tip of the μ phase. HAADF-STEM results show that these planar defects were mainly of two types. 1) A twin structure with a mirror plane of the middle atomic planes of the Zr₄Al₃ sheet, which was generated by shearing of atoms in the MgCu₂ sheet along the [1-10] direction. 2) A mirror-symmetrical stacking fault of two Zr₄Al₃ sheets, which was formed by the pulling out of a single MgCu₂ sheet. The planar defects were mainly caused by coordination of the distortions of the μ phase and the matrix. Segregation of Mo, Cr, and Re elements occurred near stacking faults, rather than twin structures.

Original language	English
Pages (from-to)	775-783
Number of pages	9
Journal	Journal of Alloys and Compounds
Volume	766
DOIs	https://doi.org/10.1016/j.jallcom.2018.07.035
Publication status	Published - 2018 Oct 25
Externally published	Yes

Keywords

Atomic arrangement characteristics
HAADF-STEM
Ni-base single crystal superalloys
Planar defects
μ phase

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2018.07.035

Cite this

@article{1df8d3739b314ff3b6ceec71acee4672,

title = "Atomic arrangement and formation of planar defects in the μ phase of Ni-base single crystal superalloys",

abstract = "The internal characteristics of the μ phase in Ni-base single crystal superalloys aged at 1100 °C for 1000 h were investigated via spherical aberration-corrected transmission electron microscopy. There were a large number of planar defects on the (001) plane at the growth tip of the μ phase. HAADF-STEM results show that these planar defects were mainly of two types. 1) A twin structure with a mirror plane of the middle atomic planes of the Zr4Al3 sheet, which was generated by shearing of atoms in the MgCu2 sheet along the [1-10] direction. 2) A mirror-symmetrical stacking fault of two Zr4Al3 sheets, which was formed by the pulling out of a single MgCu2 sheet. The planar defects were mainly caused by coordination of the distortions of the μ phase and the matrix. Segregation of Mo, Cr, and Re elements occurred near stacking faults, rather than twin structures.",

keywords = "Atomic arrangement characteristics, HAADF-STEM, Ni-base single crystal superalloys, Planar defects, μ phase",

author = "Shiyu Ma and Xueqiao Li and Jianxin Zhang and Jide Liu and Pan Li and Youjian Zhang and Huixin Jin and Wenyang Zhang and Yizhou Zhou and Xiaofeng Sun and Qing Zhang and Yanhui Chen and Shengcheng Mao",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China (Grant 51771102 , No. 51271097 and No. 51471098 ). Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = oct,

day = "25",

doi = "10.1016/j.jallcom.2018.07.035",

language = "English",

volume = "766",

pages = "775--783",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Atomic arrangement and formation of planar defects in the μ phase of Ni-base single crystal superalloys

AU - Ma, Shiyu

AU - Li, Xueqiao

AU - Zhang, Jianxin

AU - Liu, Jide

AU - Li, Pan

AU - Zhang, Youjian

AU - Jin, Huixin

AU - Zhang, Wenyang

AU - Zhou, Yizhou

AU - Sun, Xiaofeng

AU - Zhang, Qing

AU - Chen, Yanhui

AU - Mao, Shengcheng

PY - 2018/10/25

Y1 - 2018/10/25

N2 - The internal characteristics of the μ phase in Ni-base single crystal superalloys aged at 1100 °C for 1000 h were investigated via spherical aberration-corrected transmission electron microscopy. There were a large number of planar defects on the (001) plane at the growth tip of the μ phase. HAADF-STEM results show that these planar defects were mainly of two types. 1) A twin structure with a mirror plane of the middle atomic planes of the Zr4Al3 sheet, which was generated by shearing of atoms in the MgCu2 sheet along the [1-10] direction. 2) A mirror-symmetrical stacking fault of two Zr4Al3 sheets, which was formed by the pulling out of a single MgCu2 sheet. The planar defects were mainly caused by coordination of the distortions of the μ phase and the matrix. Segregation of Mo, Cr, and Re elements occurred near stacking faults, rather than twin structures.

AB - The internal characteristics of the μ phase in Ni-base single crystal superalloys aged at 1100 °C for 1000 h were investigated via spherical aberration-corrected transmission electron microscopy. There were a large number of planar defects on the (001) plane at the growth tip of the μ phase. HAADF-STEM results show that these planar defects were mainly of two types. 1) A twin structure with a mirror plane of the middle atomic planes of the Zr4Al3 sheet, which was generated by shearing of atoms in the MgCu2 sheet along the [1-10] direction. 2) A mirror-symmetrical stacking fault of two Zr4Al3 sheets, which was formed by the pulling out of a single MgCu2 sheet. The planar defects were mainly caused by coordination of the distortions of the μ phase and the matrix. Segregation of Mo, Cr, and Re elements occurred near stacking faults, rather than twin structures.

KW - Atomic arrangement characteristics

KW - HAADF-STEM

KW - Ni-base single crystal superalloys

KW - Planar defects

KW - μ phase

UR - http://www.scopus.com/inward/record.url?scp=85049453741&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85049453741&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2018.07.035

DO - 10.1016/j.jallcom.2018.07.035

M3 - Article

AN - SCOPUS:85049453741

SN - 0925-8388

VL - 766

SP - 775

EP - 783

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Atomic arrangement and formation of planar defects in the μ phase of Ni-base single crystal superalloys

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this