The formation and thermostability of MgO and MgAl2O4 nanoparticles in oxidized SiC particle-reinforced Al-Mg composites

Z. Shi, S. Ochiai, M. Gu, M. Hojo, Jae-chul Lee

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Interfacial reactions and their products in oxidized SiC particle-reinforced Al-Mg matrix composites were investigated using X-ray diffraction and Field EmissionScanning Electron Microscopy (FE-SEM). Observation of the interfacial reaction between oxidized SiC particles and aluminum alloys containing Mg showed that nanoparticles of MgO form initially and do not change form when more than 4 wt. % Mg is in the matrix. However, MgO transforms into octahedral MgAl2O4 crystals when less than 2 wt. % Mg is in the matrix. Comparison of the amounts and the sizes of the reaction products MgAl2O4 and MgO between the Al-Mg alloys with different matrix compositions shows that fewer MgAl2O4 crystals form at the surface of the particles in the 2014Al matrix composite than in the Al-2 wt. % Mg (Al-2Mg) matrix composite. Also, the size of MgAl2O 4 in the former composite is greater than that of the latter composite under the same conditions. However, the amount and the size of MgO crystals that form in the Al-4 wt. % Mg (Al-4Mg) matrix composite is almost the same as that of the Al-8 wt. % Mg (Al-8Mg) composite, and the size of MgO changes a little during heat-treatment at elevated temperatures. The amount of the reaction product (either MgO or MgAl2O4) depends on nucleation rates and density of nucleation sites on the oxidized SiC particles at the initial reaction. The more completely the nuclei cover the surface of the oxidized SiC particles, the smaller the resulting size. According to the results, an addition of Mg into the matrix can be used to control the interfacial characteristics in the oxidized SiC/Al composites.

Original languageEnglish
Pages (from-to)97-104
Number of pages8
JournalApplied Physics A: Materials Science and Processing
Volume74
Issue number1
DOIs
Publication statusPublished - 2002 Dec 1
Externally publishedYes

Fingerprint

thermal stability
Nanoparticles
nanoparticles
composite materials
Composite materials
matrices
Surface chemistry
Reaction products
reaction products
Crystals
Nucleation
nucleation
crystals
spinell
aluminum alloys
Electron microscopy
Aluminum alloys
electron microscopy
heat treatment
Heat treatment

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

The formation and thermostability of MgO and MgAl2O4 nanoparticles in oxidized SiC particle-reinforced Al-Mg composites. / Shi, Z.; Ochiai, S.; Gu, M.; Hojo, M.; Lee, Jae-chul.

In: Applied Physics A: Materials Science and Processing, Vol. 74, No. 1, 01.12.2002, p. 97-104.

Research output: Contribution to journalArticle

@article{ab2f8c59305d4be5b654355de2020318,
title = "The formation and thermostability of MgO and MgAl2O4 nanoparticles in oxidized SiC particle-reinforced Al-Mg composites",
abstract = "Interfacial reactions and their products in oxidized SiC particle-reinforced Al-Mg matrix composites were investigated using X-ray diffraction and Field EmissionScanning Electron Microscopy (FE-SEM). Observation of the interfacial reaction between oxidized SiC particles and aluminum alloys containing Mg showed that nanoparticles of MgO form initially and do not change form when more than 4 wt. {\%} Mg is in the matrix. However, MgO transforms into octahedral MgAl2O4 crystals when less than 2 wt. {\%} Mg is in the matrix. Comparison of the amounts and the sizes of the reaction products MgAl2O4 and MgO between the Al-Mg alloys with different matrix compositions shows that fewer MgAl2O4 crystals form at the surface of the particles in the 2014Al matrix composite than in the Al-2 wt. {\%} Mg (Al-2Mg) matrix composite. Also, the size of MgAl2O 4 in the former composite is greater than that of the latter composite under the same conditions. However, the amount and the size of MgO crystals that form in the Al-4 wt. {\%} Mg (Al-4Mg) matrix composite is almost the same as that of the Al-8 wt. {\%} Mg (Al-8Mg) composite, and the size of MgO changes a little during heat-treatment at elevated temperatures. The amount of the reaction product (either MgO or MgAl2O4) depends on nucleation rates and density of nucleation sites on the oxidized SiC particles at the initial reaction. The more completely the nuclei cover the surface of the oxidized SiC particles, the smaller the resulting size. According to the results, an addition of Mg into the matrix can be used to control the interfacial characteristics in the oxidized SiC/Al composites.",
author = "Z. Shi and S. Ochiai and M. Gu and M. Hojo and Jae-chul Lee",
year = "2002",
month = "12",
day = "1",
doi = "10.1007/s003390100844",
language = "English",
volume = "74",
pages = "97--104",
journal = "Applied Physics",
issn = "0340-3793",
publisher = "Springer Heidelberg",
number = "1",

}

TY - JOUR

T1 - The formation and thermostability of MgO and MgAl2O4 nanoparticles in oxidized SiC particle-reinforced Al-Mg composites

AU - Shi, Z.

AU - Ochiai, S.

AU - Gu, M.

AU - Hojo, M.

AU - Lee, Jae-chul

PY - 2002/12/1

Y1 - 2002/12/1

N2 - Interfacial reactions and their products in oxidized SiC particle-reinforced Al-Mg matrix composites were investigated using X-ray diffraction and Field EmissionScanning Electron Microscopy (FE-SEM). Observation of the interfacial reaction between oxidized SiC particles and aluminum alloys containing Mg showed that nanoparticles of MgO form initially and do not change form when more than 4 wt. % Mg is in the matrix. However, MgO transforms into octahedral MgAl2O4 crystals when less than 2 wt. % Mg is in the matrix. Comparison of the amounts and the sizes of the reaction products MgAl2O4 and MgO between the Al-Mg alloys with different matrix compositions shows that fewer MgAl2O4 crystals form at the surface of the particles in the 2014Al matrix composite than in the Al-2 wt. % Mg (Al-2Mg) matrix composite. Also, the size of MgAl2O 4 in the former composite is greater than that of the latter composite under the same conditions. However, the amount and the size of MgO crystals that form in the Al-4 wt. % Mg (Al-4Mg) matrix composite is almost the same as that of the Al-8 wt. % Mg (Al-8Mg) composite, and the size of MgO changes a little during heat-treatment at elevated temperatures. The amount of the reaction product (either MgO or MgAl2O4) depends on nucleation rates and density of nucleation sites on the oxidized SiC particles at the initial reaction. The more completely the nuclei cover the surface of the oxidized SiC particles, the smaller the resulting size. According to the results, an addition of Mg into the matrix can be used to control the interfacial characteristics in the oxidized SiC/Al composites.

AB - Interfacial reactions and their products in oxidized SiC particle-reinforced Al-Mg matrix composites were investigated using X-ray diffraction and Field EmissionScanning Electron Microscopy (FE-SEM). Observation of the interfacial reaction between oxidized SiC particles and aluminum alloys containing Mg showed that nanoparticles of MgO form initially and do not change form when more than 4 wt. % Mg is in the matrix. However, MgO transforms into octahedral MgAl2O4 crystals when less than 2 wt. % Mg is in the matrix. Comparison of the amounts and the sizes of the reaction products MgAl2O4 and MgO between the Al-Mg alloys with different matrix compositions shows that fewer MgAl2O4 crystals form at the surface of the particles in the 2014Al matrix composite than in the Al-2 wt. % Mg (Al-2Mg) matrix composite. Also, the size of MgAl2O 4 in the former composite is greater than that of the latter composite under the same conditions. However, the amount and the size of MgO crystals that form in the Al-4 wt. % Mg (Al-4Mg) matrix composite is almost the same as that of the Al-8 wt. % Mg (Al-8Mg) composite, and the size of MgO changes a little during heat-treatment at elevated temperatures. The amount of the reaction product (either MgO or MgAl2O4) depends on nucleation rates and density of nucleation sites on the oxidized SiC particles at the initial reaction. The more completely the nuclei cover the surface of the oxidized SiC particles, the smaller the resulting size. According to the results, an addition of Mg into the matrix can be used to control the interfacial characteristics in the oxidized SiC/Al composites.

UR - http://www.scopus.com/inward/record.url?scp=23944477378&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=23944477378&partnerID=8YFLogxK

U2 - 10.1007/s003390100844

DO - 10.1007/s003390100844

M3 - Article

AN - SCOPUS:23944477378

VL - 74

SP - 97

EP - 104

JO - Applied Physics

JF - Applied Physics

SN - 0340-3793

IS - 1

ER -