Microstructure and surface oxides of rapidly solidified Nb-Si based alloy powders

Yueling Guo; Lina Jia; Bin Kong; Shengnan Zhang; Fengxiang Zhang; Hu Zhang

doi:10.1016/j.matdes.2017.02.014

Microstructure and surface oxides of rapidly solidified Nb-Si based alloy powders

Yueling Guo, Lina Jia^*, Bin Kong, Shengnan Zhang, Fengxiang Zhang, Hu Zhang

^*Corresponding author for this work

Beihang University

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

19 Citations (Scopus)

Abstract

Spherical pre-alloyed Nb-20Si-24Ti-2Cr-2Al powders were prepared by plasma rotating electrode processing (PREP). The microstructure and surface oxides of Nb-Si based alloy powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectra (XPS) and Auger electron spectroscopy (AES). Results showed that the main phases of Nb-Si based alloy powders were Nbss, βNb₅Si₃ and Nb₃Si. Fine lamellar eutectic structure was formed during solidification, taking the central parts of eutectic branches. Anomalous eutectics were distributed at the edges of eutectic branches. The lamellar spacing (λ) ranged from 0.12 μm to 0.38 μm, increasing with the increase of powder diameter. An oxygen-enriched layer with 5.14 nm in thickness, consisting of Nb₂O₅, SiO₂, TiO₂, Cr₂O₃ and Al₂O₃, was formed on the surface of a powder with 120 μm in diameter. The amount of oxygen in the oxygen-enriched layer accounted for 49.66% of that in the whole single powder. Formation mechanism of eutectic structures and the surface oxidation mechanism were discussed.

Original language	English
Pages (from-to)	109-116
Number of pages	8
Journal	Materials and Design
Volume	120
DOIs	https://doi.org/10.1016/j.matdes.2017.02.014
Publication status	Published - 15 Apr 2017
Externally published	Yes

Keywords

Eutectic
Nb-Si alloy
Powder metallurgy
Surface oxide
XPS/AES analysis

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10.1016/j.matdes.2017.02.014

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@article{015f9c1db1044f96b02eb807f4bbdf37,

title = "Microstructure and surface oxides of rapidly solidified Nb-Si based alloy powders",

abstract = "Spherical pre-alloyed Nb-20Si-24Ti-2Cr-2Al powders were prepared by plasma rotating electrode processing (PREP). The microstructure and surface oxides of Nb-Si based alloy powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectra (XPS) and Auger electron spectroscopy (AES). Results showed that the main phases of Nb-Si based alloy powders were Nbss, βNb5Si3 and Nb3Si. Fine lamellar eutectic structure was formed during solidification, taking the central parts of eutectic branches. Anomalous eutectics were distributed at the edges of eutectic branches. The lamellar spacing (λ) ranged from 0.12 μm to 0.38 μm, increasing with the increase of powder diameter. An oxygen-enriched layer with 5.14 nm in thickness, consisting of Nb2O5, SiO2, TiO2, Cr2O3 and Al2O3, was formed on the surface of a powder with 120 μm in diameter. The amount of oxygen in the oxygen-enriched layer accounted for 49.66% of that in the whole single powder. Formation mechanism of eutectic structures and the surface oxidation mechanism were discussed.",

keywords = "Eutectic, Nb-Si alloy, Powder metallurgy, Surface oxide, XPS/AES analysis",

author = "Yueling Guo and Lina Jia and Bin Kong and Shengnan Zhang and Fengxiang Zhang and Hu Zhang",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

month = apr,

day = "15",

doi = "10.1016/j.matdes.2017.02.014",

language = "English",

volume = "120",

pages = "109--116",

journal = "Materials and Design",

issn = "0264-1275",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Microstructure and surface oxides of rapidly solidified Nb-Si based alloy powders

AU - Guo, Yueling

AU - Jia, Lina

AU - Kong, Bin

AU - Zhang, Shengnan

AU - Zhang, Fengxiang

AU - Zhang, Hu

PY - 2017/4/15

Y1 - 2017/4/15

N2 - Spherical pre-alloyed Nb-20Si-24Ti-2Cr-2Al powders were prepared by plasma rotating electrode processing (PREP). The microstructure and surface oxides of Nb-Si based alloy powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectra (XPS) and Auger electron spectroscopy (AES). Results showed that the main phases of Nb-Si based alloy powders were Nbss, βNb5Si3 and Nb3Si. Fine lamellar eutectic structure was formed during solidification, taking the central parts of eutectic branches. Anomalous eutectics were distributed at the edges of eutectic branches. The lamellar spacing (λ) ranged from 0.12 μm to 0.38 μm, increasing with the increase of powder diameter. An oxygen-enriched layer with 5.14 nm in thickness, consisting of Nb2O5, SiO2, TiO2, Cr2O3 and Al2O3, was formed on the surface of a powder with 120 μm in diameter. The amount of oxygen in the oxygen-enriched layer accounted for 49.66% of that in the whole single powder. Formation mechanism of eutectic structures and the surface oxidation mechanism were discussed.

AB - Spherical pre-alloyed Nb-20Si-24Ti-2Cr-2Al powders were prepared by plasma rotating electrode processing (PREP). The microstructure and surface oxides of Nb-Si based alloy powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectra (XPS) and Auger electron spectroscopy (AES). Results showed that the main phases of Nb-Si based alloy powders were Nbss, βNb5Si3 and Nb3Si. Fine lamellar eutectic structure was formed during solidification, taking the central parts of eutectic branches. Anomalous eutectics were distributed at the edges of eutectic branches. The lamellar spacing (λ) ranged from 0.12 μm to 0.38 μm, increasing with the increase of powder diameter. An oxygen-enriched layer with 5.14 nm in thickness, consisting of Nb2O5, SiO2, TiO2, Cr2O3 and Al2O3, was formed on the surface of a powder with 120 μm in diameter. The amount of oxygen in the oxygen-enriched layer accounted for 49.66% of that in the whole single powder. Formation mechanism of eutectic structures and the surface oxidation mechanism were discussed.

KW - Eutectic

KW - Nb-Si alloy

KW - Powder metallurgy

KW - Surface oxide

KW - XPS/AES analysis

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U2 - 10.1016/j.matdes.2017.02.014

DO - 10.1016/j.matdes.2017.02.014

M3 - Article

AN - SCOPUS:85012108901

SN - 0264-1275

VL - 120

SP - 109

EP - 116

JO - Materials and Design

JF - Materials and Design

ER -

Microstructure and surface oxides of rapidly solidified Nb-Si based alloy powders

Abstract

Keywords

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