Investigation on the as-cast microstructure of Nb-Nb silicide based multicomponent alloys

Zhiping Sun; Xiping Guo; Yongsheng He; Jinming Guo; Ying Yang; Y. Austin Chang

doi:10.1016/j.intermet.2010.01.024

Investigation on the as-cast microstructure of Nb-Nb silicide based multicomponent alloys

Zhiping Sun, Xiping Guo, Yongsheng He, Jinming Guo, Ying Yang, Y. Austin Chang

School of Materials Sience and Engineering

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

16 Scopus citations

Abstract

Refractory metal intermetallic composites (RMICs) based on the Nb-Ti-Si-Cr-Hf quinary are candidate materials for ultra-high temperature applications beyond 1200 °C. In this investigation, minor additions of Al, B, Y and Mo were introduced into the Nb-22Ti-(15-18)Si-6Cr-4Hf (at.%) base alloy for potential enhancement of the mechanical and environmental properties. The phases, phase compositions and morphologies in the as-cast microstructure of the base alloy with or without minor Al, B, Y and Mo additions were investigated using X-ray diffraction (XRD), optical metallography (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDS) and electron probe microanalysis (EPMA). The experimental results obtained from several selected alloys were found to agree with the solidification paths calculated from the Scheil model using established thermodynamic properties of all the phases in the Nb-Ti-Si-Cr-Hf-Al system.

Original language	English
Pages (from-to)	992-997
Number of pages	6
Journal	Intermetallics
Volume	18
Issue number	5
DOIs	https://doi.org/10.1016/j.intermet.2010.01.024
State	Published - May 2010

Keywords

A. Intermetallics, miscellaneous
A. Silicides, various
B. Thermodynamic and thermochemical properties
C. Casting
D. Microstructure

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10.1016/j.intermet.2010.01.024

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title = "Investigation on the as-cast microstructure of Nb-Nb silicide based multicomponent alloys",

abstract = "Refractory metal intermetallic composites (RMICs) based on the Nb-Ti-Si-Cr-Hf quinary are candidate materials for ultra-high temperature applications beyond 1200 °C. In this investigation, minor additions of Al, B, Y and Mo were introduced into the Nb-22Ti-(15-18)Si-6Cr-4Hf (at.%) base alloy for potential enhancement of the mechanical and environmental properties. The phases, phase compositions and morphologies in the as-cast microstructure of the base alloy with or without minor Al, B, Y and Mo additions were investigated using X-ray diffraction (XRD), optical metallography (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDS) and electron probe microanalysis (EPMA). The experimental results obtained from several selected alloys were found to agree with the solidification paths calculated from the Scheil model using established thermodynamic properties of all the phases in the Nb-Ti-Si-Cr-Hf-Al system.",

keywords = "A. Intermetallics, miscellaneous, A. Silicides, various, B. Thermodynamic and thermochemical properties, C. Casting, D. Microstructure",

author = "Zhiping Sun and Xiping Guo and Yongsheng He and Jinming Guo and Ying Yang and Chang, {Y. Austin}",

year = "2010",

month = may,

doi = "10.1016/j.intermet.2010.01.024",

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T1 - Investigation on the as-cast microstructure of Nb-Nb silicide based multicomponent alloys

AU - Sun, Zhiping

AU - Guo, Xiping

AU - He, Yongsheng

AU - Guo, Jinming

AU - Yang, Ying

AU - Chang, Y. Austin

PY - 2010/5

Y1 - 2010/5

N2 - Refractory metal intermetallic composites (RMICs) based on the Nb-Ti-Si-Cr-Hf quinary are candidate materials for ultra-high temperature applications beyond 1200 °C. In this investigation, minor additions of Al, B, Y and Mo were introduced into the Nb-22Ti-(15-18)Si-6Cr-4Hf (at.%) base alloy for potential enhancement of the mechanical and environmental properties. The phases, phase compositions and morphologies in the as-cast microstructure of the base alloy with or without minor Al, B, Y and Mo additions were investigated using X-ray diffraction (XRD), optical metallography (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDS) and electron probe microanalysis (EPMA). The experimental results obtained from several selected alloys were found to agree with the solidification paths calculated from the Scheil model using established thermodynamic properties of all the phases in the Nb-Ti-Si-Cr-Hf-Al system.

AB - Refractory metal intermetallic composites (RMICs) based on the Nb-Ti-Si-Cr-Hf quinary are candidate materials for ultra-high temperature applications beyond 1200 °C. In this investigation, minor additions of Al, B, Y and Mo were introduced into the Nb-22Ti-(15-18)Si-6Cr-4Hf (at.%) base alloy for potential enhancement of the mechanical and environmental properties. The phases, phase compositions and morphologies in the as-cast microstructure of the base alloy with or without minor Al, B, Y and Mo additions were investigated using X-ray diffraction (XRD), optical metallography (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDS) and electron probe microanalysis (EPMA). The experimental results obtained from several selected alloys were found to agree with the solidification paths calculated from the Scheil model using established thermodynamic properties of all the phases in the Nb-Ti-Si-Cr-Hf-Al system.

KW - A. Intermetallics, miscellaneous

KW - A. Silicides, various

KW - B. Thermodynamic and thermochemical properties

KW - C. Casting

KW - D. Microstructure

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DO - 10.1016/j.intermet.2010.01.024

M3 - 文章

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SN - 0966-9795

VL - 18

SP - 992

EP - 997

JO - Intermetallics

JF - Intermetallics

IS - 5

ER -

Investigation on the as-cast microstructure of Nb-Nb silicide based multicomponent alloys

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Keywords

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