The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys

Stoichko Antonov; Wei Chen; Song Lu; Dieter Isheim; David N. Seidman; Qiang Feng; Eugene Sun; Sammy Tin

doi:10.1016/j.scriptamat.2018.10.015

The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys

Stoichko Antonov
, Wei Chen
, Song Lu
, Dieter Isheim
, David N. Seidman
, Qiang Feng
, Eugene Sun
, Sammy Tin

Department of Materials Design and Innovation

University of Science and Technology Beijing
Illinois Institute of Technology
Northwestern University
Rolls-Royce

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

30 Scopus citations

Abstract

The effect of phosphorous on the microstructure of a powder-processed, high Nb-content, Ni-based superalloy was studied and compared to a P-free variant. The P-doped sample had a lower incipient melting temperature, forming a (Ni, Co, Cr, P)₂(Nb, Mo) laves phase along the grain boundaries. Transmission electron microscopy and atom probe tomography were used to identify the crystal structure, assess phase compositions, and determine any elemental segregation to phase boundaries. The results revealed strong partitioning of P to the laves phase and a slight Mo gradient towards the γ′ phrase. Finally, a simplified laves phase was successfully modeled via density functional theory calculations.

Original language	English
Pages (from-to)	44-48
Number of pages	5
Journal	Scripta Materialia
Volume	161
DOIs	https://doi.org/10.1016/j.scriptamat.2018.10.015
State	Published - Mar 1 2019

Keywords

Atom probe tomography
Density functional theory
Laves
Phosphorous
Superalloy

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10.1016/j.scriptamat.2018.10.015

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title = "The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys",

abstract = "The effect of phosphorous on the microstructure of a powder-processed, high Nb-content, Ni-based superalloy was studied and compared to a P-free variant. The P-doped sample had a lower incipient melting temperature, forming a (Ni, Co, Cr, P)2(Nb, Mo) laves phase along the grain boundaries. Transmission electron microscopy and atom probe tomography were used to identify the crystal structure, assess phase compositions, and determine any elemental segregation to phase boundaries. The results revealed strong partitioning of P to the laves phase and a slight Mo gradient towards the γ′ phrase. Finally, a simplified laves phase was successfully modeled via density functional theory calculations.",

keywords = "Atom probe tomography, Density functional theory, Laves, Phosphorous, Superalloy",

author = "Stoichko Antonov and Wei Chen and Song Lu and Dieter Isheim and Seidman, \{David N.\} and Qiang Feng and Eugene Sun and Sammy Tin",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

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doi = "10.1016/j.scriptamat.2018.10.015",

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T1 - The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys

AU - Antonov, Stoichko

AU - Chen, Wei

AU - Lu, Song

AU - Isheim, Dieter

AU - Seidman, David N.

AU - Feng, Qiang

AU - Sun, Eugene

AU - Tin, Sammy

PY - 2019/3/1

Y1 - 2019/3/1

N2 - The effect of phosphorous on the microstructure of a powder-processed, high Nb-content, Ni-based superalloy was studied and compared to a P-free variant. The P-doped sample had a lower incipient melting temperature, forming a (Ni, Co, Cr, P)2(Nb, Mo) laves phase along the grain boundaries. Transmission electron microscopy and atom probe tomography were used to identify the crystal structure, assess phase compositions, and determine any elemental segregation to phase boundaries. The results revealed strong partitioning of P to the laves phase and a slight Mo gradient towards the γ′ phrase. Finally, a simplified laves phase was successfully modeled via density functional theory calculations.

AB - The effect of phosphorous on the microstructure of a powder-processed, high Nb-content, Ni-based superalloy was studied and compared to a P-free variant. The P-doped sample had a lower incipient melting temperature, forming a (Ni, Co, Cr, P)2(Nb, Mo) laves phase along the grain boundaries. Transmission electron microscopy and atom probe tomography were used to identify the crystal structure, assess phase compositions, and determine any elemental segregation to phase boundaries. The results revealed strong partitioning of P to the laves phase and a slight Mo gradient towards the γ′ phrase. Finally, a simplified laves phase was successfully modeled via density functional theory calculations.

KW - Atom probe tomography

KW - Density functional theory

KW - Laves

KW - Phosphorous

KW - Superalloy

UR - https://www.scopus.com/pages/publications/85054925860

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DO - 10.1016/j.scriptamat.2018.10.015

M3 - Article

AN - SCOPUS:85054925860

SN - 1359-6462

VL - 161

SP - 44

EP - 48

JO - Scripta Materialia

JF - Scripta Materialia

ER -

The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys

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Keywords

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