Crystallographic account of nano-scaled intergrowth of M2B-type borides in nickel-based superalloys

Xiaobing Hu; Y. L. Zhu; X. L. Ma

doi:10.1016/j.actamat.2014.01.002

Crystallographic account of nano-scaled intergrowth of M₂B-type borides in nickel-based superalloys

Xiaobing Hu, Y. L. Zhu, X. L. Ma^*

^*Corresponding author for this work

NUANCE - Atomic and Nanoscale Characterization Experimental Center

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

48 Scopus citations

Abstract

M₂B-type borides in nickel-based superalloys containing boron subjected to long-term aging treatments were investigated by means of analytical transmission electron microscopy. Contrast analysis and electron diffraction show that the boride precipitations have dual-phase structures (I4/mcm, C16; Fddd, C_b) with a high density of stacking faults. The faulted planes and displacement vectors are determined as (1 1 0)_C16 and [ _11̄1]C16/4 in C16 structure and (1 0 0)_Cb and [0 1 1]_Cb/4 in C_b structure. Structural models based on a polyhedron of square anti-prisms are proposed not only to rationalize the stacking faults, 60 rotation twin and the intergrowth of structural variants, but also to interpret the newly observed structure in M₂B-type borides.

Original language	English (US)
Pages (from-to)	70-81
Number of pages	12
Journal	Acta Materialia
Volume	68
DOIs	https://doi.org/10.1016/j.actamat.2014.01.002
State	Published - Apr 15 2014

Funding

This work is supported by the National Basic Research Program of China ( 2009CB623705 and 2010CB631206 ). The authors are grateful to J. Wang for bulk sample preparation and to Prof. S.B. Mi for useful discussions.

Keywords

Intergrowth
MB-type boride
Nickel-based superalloy
Polytypic structure
Transmission electron microscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

Access to Document

10.1016/j.actamat.2014.01.002

Cite this

@article{f29c053dfea244a58f4042cba02bccbf,

title = "Crystallographic account of nano-scaled intergrowth of M2B-type borides in nickel-based superalloys",

abstract = "M2B-type borides in nickel-based superalloys containing boron subjected to long-term aging treatments were investigated by means of analytical transmission electron microscopy. Contrast analysis and electron diffraction show that the boride precipitations have dual-phase structures (I4/mcm, C16; Fddd, Cb) with a high density of stacking faults. The faulted planes and displacement vectors are determined as (1 1 0)C16 and [ 1{\=1}1]C16/4 in C16 structure and (1 0 0)Cb and [0 1 1]Cb/4 in Cb structure. Structural models based on a polyhedron of square anti-prisms are proposed not only to rationalize the stacking faults, 60 rotation twin and the intergrowth of structural variants, but also to interpret the newly observed structure in M2B-type borides.",

keywords = "Intergrowth, MB-type boride, Nickel-based superalloy, Polytypic structure, Transmission electron microscopy",

author = "Xiaobing Hu and Zhu, {Y. L.} and Ma, {X. L.}",

note = "Funding Information: This work is supported by the National Basic Research Program of China ( 2009CB623705 and 2010CB631206 ). The authors are grateful to J. Wang for bulk sample preparation and to Prof. S.B. Mi for useful discussions.",

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doi = "10.1016/j.actamat.2014.01.002",

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AU - Hu, Xiaobing

AU - Zhu, Y. L.

AU - Ma, X. L.

N1 - Funding Information: This work is supported by the National Basic Research Program of China ( 2009CB623705 and 2010CB631206 ). The authors are grateful to J. Wang for bulk sample preparation and to Prof. S.B. Mi for useful discussions.

PY - 2014/4/15

Y1 - 2014/4/15

N2 - M2B-type borides in nickel-based superalloys containing boron subjected to long-term aging treatments were investigated by means of analytical transmission electron microscopy. Contrast analysis and electron diffraction show that the boride precipitations have dual-phase structures (I4/mcm, C16; Fddd, Cb) with a high density of stacking faults. The faulted planes and displacement vectors are determined as (1 1 0)C16 and [ 11̄1]C16/4 in C16 structure and (1 0 0)Cb and [0 1 1]Cb/4 in Cb structure. Structural models based on a polyhedron of square anti-prisms are proposed not only to rationalize the stacking faults, 60 rotation twin and the intergrowth of structural variants, but also to interpret the newly observed structure in M2B-type borides.

AB - M2B-type borides in nickel-based superalloys containing boron subjected to long-term aging treatments were investigated by means of analytical transmission electron microscopy. Contrast analysis and electron diffraction show that the boride precipitations have dual-phase structures (I4/mcm, C16; Fddd, Cb) with a high density of stacking faults. The faulted planes and displacement vectors are determined as (1 1 0)C16 and [ 11̄1]C16/4 in C16 structure and (1 0 0)Cb and [0 1 1]Cb/4 in Cb structure. Structural models based on a polyhedron of square anti-prisms are proposed not only to rationalize the stacking faults, 60 rotation twin and the intergrowth of structural variants, but also to interpret the newly observed structure in M2B-type borides.

KW - Intergrowth

KW - MB-type boride

KW - Nickel-based superalloy

KW - Polytypic structure

KW - Transmission electron microscopy

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