Precipitation of γNb5Si3 in Nb-Si based ultrahigh temperature alloys

Xiao Ma; Xiping Guo; Maosen Fu

doi:10.1016/j.intermet.2018.04.007

Precipitation of γNb₅Si₃ in Nb-Si based ultrahigh temperature alloys

Xiao Ma, Xiping Guo, Maosen Fu

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

21 Scopus citations

Abstract

Hexagonal γNb₅Si₃ plates have precipitated from Nb solid solution in heat-treated Nb-Si based ultrahigh temperature alloys. The orientation relationships (ORs) and interfacial structures between γNb₅Si₃ precipitates and Nb solid solution matrix have been investigated by high-resolution transmission electron microscopy (HRTEM). The ORs have been determined as [111]_Nb//[0001]_γ and (101¯)_Nb//(11¯00)_γ with a near coherent interface. The interfacial structure has been interpreted with the Coincidence site lattice/Displacement shift complete lattice (CSL/DSC) model, forming an array of phase boundary dislocations (PBDs) on the interface. PBDs with Burgers vectors of b→=[Formula presented]<1¯21¯>_Nb on (111)_Nb plane might promote the precipitation of γNb₅Si₃.

Original language	English
Pages (from-to)	11-17
Number of pages	7
Journal	Intermetallics
Volume	98
DOIs	https://doi.org/10.1016/j.intermet.2018.04.007
State	Published - Jul 2018

Keywords

CSL/DSC model
Electron transmission microscopy
Interfaces
Intermetallics
Precipitation

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10.1016/j.intermet.2018.04.007

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title = "Precipitation of γNb5Si3 in Nb-Si based ultrahigh temperature alloys",

abstract = "Hexagonal γNb5Si3 plates have precipitated from Nb solid solution in heat-treated Nb-Si based ultrahigh temperature alloys. The orientation relationships (ORs) and interfacial structures between γNb5Si3 precipitates and Nb solid solution matrix have been investigated by high-resolution transmission electron microscopy (HRTEM). The ORs have been determined as [111]Nb//[0001]γ and (101¯)Nb//(11¯00)γ with a near coherent interface. The interfacial structure has been interpreted with the Coincidence site lattice/Displacement shift complete lattice (CSL/DSC) model, forming an array of phase boundary dislocations (PBDs) on the interface. PBDs with Burgers vectors of b→=[Formula presented]<1¯21¯>Nb on (111)Nb plane might promote the precipitation of γNb5Si3.",

keywords = "CSL/DSC model, Electron transmission microscopy, Interfaces, Intermetallics, Precipitation",

author = "Xiao Ma and Xiping Guo and Maosen Fu",

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

year = "2018",

month = jul,

doi = "10.1016/j.intermet.2018.04.007",

language = "英语",

volume = "98",

pages = "11--17",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Precipitation of γNb5Si3 in Nb-Si based ultrahigh temperature alloys

AU - Ma, Xiao

AU - Guo, Xiping

AU - Fu, Maosen

PY - 2018/7

Y1 - 2018/7

N2 - Hexagonal γNb5Si3 plates have precipitated from Nb solid solution in heat-treated Nb-Si based ultrahigh temperature alloys. The orientation relationships (ORs) and interfacial structures between γNb5Si3 precipitates and Nb solid solution matrix have been investigated by high-resolution transmission electron microscopy (HRTEM). The ORs have been determined as [111]Nb//[0001]γ and (101¯)Nb//(11¯00)γ with a near coherent interface. The interfacial structure has been interpreted with the Coincidence site lattice/Displacement shift complete lattice (CSL/DSC) model, forming an array of phase boundary dislocations (PBDs) on the interface. PBDs with Burgers vectors of b→=[Formula presented]<1¯21¯>Nb on (111)Nb plane might promote the precipitation of γNb5Si3.

AB - Hexagonal γNb5Si3 plates have precipitated from Nb solid solution in heat-treated Nb-Si based ultrahigh temperature alloys. The orientation relationships (ORs) and interfacial structures between γNb5Si3 precipitates and Nb solid solution matrix have been investigated by high-resolution transmission electron microscopy (HRTEM). The ORs have been determined as [111]Nb//[0001]γ and (101¯)Nb//(11¯00)γ with a near coherent interface. The interfacial structure has been interpreted with the Coincidence site lattice/Displacement shift complete lattice (CSL/DSC) model, forming an array of phase boundary dislocations (PBDs) on the interface. PBDs with Burgers vectors of b→=[Formula presented]<1¯21¯>Nb on (111)Nb plane might promote the precipitation of γNb5Si3.

KW - CSL/DSC model

KW - Electron transmission microscopy

KW - Interfaces

KW - Intermetallics

KW - Precipitation

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U2 - 10.1016/j.intermet.2018.04.007

DO - 10.1016/j.intermet.2018.04.007

M3 - 文章

AN - SCOPUS:85045719482

SN - 0966-9795

VL - 98

SP - 11

EP - 17

JO - Intermetallics

JF - Intermetallics

ER -

Precipitation of γNb₅Si₃ in Nb-Si based ultrahigh temperature alloys

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Keywords

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