Microstructural evolution of unidirectionally solidified Nb SS-Nb 5Si 3 eutectic alloy

Yuanyuan Lu; Jin Zhang; Lixi Tian; Yulong Li; Chaoli Ma

doi:10.1007/s12598-011-0298-1

Microstructural evolution of unidirectionally solidified Nb _SS-Nb ₅Si ₃ eutectic alloy

Yuanyuan Lu^*
, Jin Zhang
, Lixi Tian
, Yulong Li
, Chaoli Ma

^*Corresponding author for this work

School of Materials Science and Engineering

Beihang University

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

8 Scopus citations

Abstract

The microstructure of Nb _SS-Nb ₅Si ₃ eutectic alloys unidirectionally solidified at various growth rates and the phase boundary characteristics between niobium solid solution (Nb _SS) and Nb ₅Si ₃ phases in these alloys were studied, by using electron probe microanalysis (EPMA) and electron backscatter diffraction (EBSD) method. Lower growth rate is beneficial to form lamellar eutectic structure. When the growth rate decreased to 3 mm/h, large-scale regular lamellas could be detected in alternative distribution. Three kinds of crystallographic orientation patterns, i.e. {111}Nb//{011}Nb ₅Si ₃, {110}Nb//{111}Nb ₅Si ₃ and {112}Nb//{100}Nb ₅Si ₃ were identified in lamellar and non-lamellar eutectic structures with different growth rate conditions. Associated with the X-ray diffraction (XRD) results about investigated alloys, two-phase eutectic growth shows strong preferential orientation when growth rate is low. The influence of growth rate on microstructural evolution in unidirectionally solidified NbSS-Nb5Si3 eutectic alloy had been discussed in this paper.

Original language	English
Pages (from-to)	335-339
Number of pages	5
Journal	Rare Metals
Volume	30
Issue number	SUPPL.1
DOIs	https://doi.org/10.1007/s12598-011-0298-1
State	Published - Mar 2011

Keywords

EBSD
Lamellar structure
Nb -Nb Si eutectic alloy
Phase boundary
Unidirectional solidification

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10.1007/s12598-011-0298-1

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title = "Microstructural evolution of unidirectionally solidified Nb SS-Nb 5Si 3 eutectic alloy",

abstract = "The microstructure of Nb SS-Nb 5Si 3 eutectic alloys unidirectionally solidified at various growth rates and the phase boundary characteristics between niobium solid solution (Nb SS) and Nb 5Si 3 phases in these alloys were studied, by using electron probe microanalysis (EPMA) and electron backscatter diffraction (EBSD) method. Lower growth rate is beneficial to form lamellar eutectic structure. When the growth rate decreased to 3 mm/h, large-scale regular lamellas could be detected in alternative distribution. Three kinds of crystallographic orientation patterns, i.e. \{111\}Nb//\{011\}Nb 5Si 3, \{110\}Nb//\{111\}Nb 5Si 3 and \{112\}Nb//\{100\}Nb 5Si 3 were identified in lamellar and non-lamellar eutectic structures with different growth rate conditions. Associated with the X-ray diffraction (XRD) results about investigated alloys, two-phase eutectic growth shows strong preferential orientation when growth rate is low. The influence of growth rate on microstructural evolution in unidirectionally solidified NbSS-Nb5Si3 eutectic alloy had been discussed in this paper.",

keywords = "EBSD, Lamellar structure, Nb -Nb Si eutectic alloy, Phase boundary, Unidirectional solidification",

author = "Yuanyuan Lu and Jin Zhang and Lixi Tian and Yulong Li and Chaoli Ma",

year = "2011",

month = mar,

doi = "10.1007/s12598-011-0298-1",

language = "英语",

volume = "30",

pages = "335--339",

journal = "Rare Metals",

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TY - JOUR

T1 - Microstructural evolution of unidirectionally solidified Nb SS-Nb 5Si 3 eutectic alloy

AU - Lu, Yuanyuan

AU - Zhang, Jin

AU - Tian, Lixi

AU - Li, Yulong

AU - Ma, Chaoli

PY - 2011/3

Y1 - 2011/3

N2 - The microstructure of Nb SS-Nb 5Si 3 eutectic alloys unidirectionally solidified at various growth rates and the phase boundary characteristics between niobium solid solution (Nb SS) and Nb 5Si 3 phases in these alloys were studied, by using electron probe microanalysis (EPMA) and electron backscatter diffraction (EBSD) method. Lower growth rate is beneficial to form lamellar eutectic structure. When the growth rate decreased to 3 mm/h, large-scale regular lamellas could be detected in alternative distribution. Three kinds of crystallographic orientation patterns, i.e. {111}Nb//{011}Nb 5Si 3, {110}Nb//{111}Nb 5Si 3 and {112}Nb//{100}Nb 5Si 3 were identified in lamellar and non-lamellar eutectic structures with different growth rate conditions. Associated with the X-ray diffraction (XRD) results about investigated alloys, two-phase eutectic growth shows strong preferential orientation when growth rate is low. The influence of growth rate on microstructural evolution in unidirectionally solidified NbSS-Nb5Si3 eutectic alloy had been discussed in this paper.

AB - The microstructure of Nb SS-Nb 5Si 3 eutectic alloys unidirectionally solidified at various growth rates and the phase boundary characteristics between niobium solid solution (Nb SS) and Nb 5Si 3 phases in these alloys were studied, by using electron probe microanalysis (EPMA) and electron backscatter diffraction (EBSD) method. Lower growth rate is beneficial to form lamellar eutectic structure. When the growth rate decreased to 3 mm/h, large-scale regular lamellas could be detected in alternative distribution. Three kinds of crystallographic orientation patterns, i.e. {111}Nb//{011}Nb 5Si 3, {110}Nb//{111}Nb 5Si 3 and {112}Nb//{100}Nb 5Si 3 were identified in lamellar and non-lamellar eutectic structures with different growth rate conditions. Associated with the X-ray diffraction (XRD) results about investigated alloys, two-phase eutectic growth shows strong preferential orientation when growth rate is low. The influence of growth rate on microstructural evolution in unidirectionally solidified NbSS-Nb5Si3 eutectic alloy had been discussed in this paper.

KW - EBSD

KW - Lamellar structure

KW - Nb -Nb Si eutectic alloy

KW - Phase boundary

KW - Unidirectional solidification

UR - https://www.scopus.com/pages/publications/84862967287

U2 - 10.1007/s12598-011-0298-1

DO - 10.1007/s12598-011-0298-1

M3 - 文章

AN - SCOPUS:84862967287

SN - 1001-0521

VL - 30

SP - 335

EP - 339

JO - Rare Metals

JF - Rare Metals

IS - SUPPL.1

ER -

Microstructural evolution of unidirectionally solidified Nb _SS-Nb ₅Si ₃ eutectic alloy

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