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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.

Authors:
 [1];  [2];  [3];  [4];  [4];  [3];  [5];  [2]
  1. Univ. of Science and Technology, Beijing (China). Beijing Advanced Innovation Center for Materials Genome Engineering, State Key Lab. for Advanced Metals and Materials; Illinois Inst. of Technology, Chicago, IL (United States)
  2. Illinois Inst. of Technology, Chicago, IL (United States)
  3. Univ. of Science and Technology, Beijing (China). Beijing Advanced Innovation Center for Materials Genome Engineering, State Key Lab. for Advanced Metals and Materials
  4. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering; Northwestern Univ. Center for Atom Probe Tomography (NUCAPT), Evanston, IL (United States)
  5. Rolls-Royce Corporation, Indianapolis, IN (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1530611
DOE Contract Number:  
AC02-05CH11231; AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 161; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Antonov, Stoichko, Chen, Wei, Lu, Song, Isheim, Dieter, Seidman, David N., Feng, Qiang, Sun, Eugene, and Tin, Sammy. The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys. United States: N. p., 2019. Web. doi:10.1016/j.scriptamat.2018.10.015.
Antonov, Stoichko, Chen, Wei, Lu, Song, Isheim, Dieter, Seidman, David N., Feng, Qiang, Sun, Eugene, & Tin, Sammy. The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys. United States. doi:10.1016/j.scriptamat.2018.10.015.
Antonov, Stoichko, Chen, Wei, Lu, Song, Isheim, Dieter, Seidman, David N., Feng, Qiang, Sun, Eugene, and Tin, Sammy. Fri . "The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys". United States. doi:10.1016/j.scriptamat.2018.10.015.
@article{osti_1530611,
title = {The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys},
author = {Antonov, Stoichko and Chen, Wei and Lu, Song and Isheim, Dieter and Seidman, David N. and Feng, Qiang and Sun, Eugene and Tin, Sammy},
abstractNote = {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.},
doi = {10.1016/j.scriptamat.2018.10.015},
journal = {Scripta Materialia},
issn = {1359-6462},
number = C,
volume = 161,
place = {United States},
year = {2019},
month = {3}
}