Kinetic analysis of spinel formation at the interface of CaO-Al2O3 fibre-reinforced Al 7075 composites

Yun Mo Sung; Jae Woo Ahn

doi:10.1023/A:1004769318641

Kinetic analysis of spinel formation at the interface of CaO-Al₂O₃ fibre-reinforced Al 7075 composites

Yun Mo Sung^*
, Jae Woo Ahn

^*Corresponding author for this work

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

5 Citations (Scopus)

Abstract

A kinetic analysis was performed on the spinel (MgAl₂O₄) formation reaction at the interfacial region of the calcium aluminate (CaO-Al₂O₃) fibre-reinforced aluminum 7075 alloy matrix composites (CA/Al 7075) processed at 1200°K. The counterdiffusion model of Mg²⁺ and Al³⁺ fluxes was employed for the spinel formation reaction. From the parabolic relation between the thickness of the spinel layer and time the reaction rate constant was determined to be a function of the average diffusion coefficient of Al³⁺ ions. By applying the parabolic equation to the experimental data of the CA/Al 7075 the average diffusion coefficient of Al³⁺ ions in the MgAl₂O₄ spinel at 1200°K was calculated and this value appeared to be in small deviation from the extrapolation of previous diffusion coefficient data.

Original language	English
Pages (from-to)	5127-5132
Number of pages	6
Journal	Journal of Materials Science
Volume	34
Issue number	20
DOIs	https://doi.org/10.1023/A:1004769318641
Publication status	Published - 1999 Oct 15
Externally published	Yes

Bibliographical note

Funding Information:
This study was partially supported by the Daejin University research grants in 1997.

ASJC Scopus subject areas

Ceramics and Composites
Materials Science (miscellaneous)
General Materials Science
Mechanics of Materials
Mechanical Engineering
Polymers and Plastics

Access to Document

10.1023/A:1004769318641

Cite this

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title = "Kinetic analysis of spinel formation at the interface of CaO-Al2O3 fibre-reinforced Al 7075 composites",

abstract = "A kinetic analysis was performed on the spinel (MgAl2O4) formation reaction at the interfacial region of the calcium aluminate (CaO-Al2O3) fibre-reinforced aluminum 7075 alloy matrix composites (CA/Al 7075) processed at 1200°K. The counterdiffusion model of Mg2+ and Al3+ fluxes was employed for the spinel formation reaction. From the parabolic relation between the thickness of the spinel layer and time the reaction rate constant was determined to be a function of the average diffusion coefficient of Al3+ ions. By applying the parabolic equation to the experimental data of the CA/Al 7075 the average diffusion coefficient of Al3+ ions in the MgAl2O4 spinel at 1200°K was calculated and this value appeared to be in small deviation from the extrapolation of previous diffusion coefficient data.",

author = "Sung, \{Yun Mo\} and Ahn, \{Jae Woo\}",

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AU - Sung, Yun Mo

AU - Ahn, Jae Woo

N1 - Funding Information: This study was partially supported by the Daejin University research grants in 1997.

PY - 1999/10/15

Y1 - 1999/10/15

N2 - A kinetic analysis was performed on the spinel (MgAl2O4) formation reaction at the interfacial region of the calcium aluminate (CaO-Al2O3) fibre-reinforced aluminum 7075 alloy matrix composites (CA/Al 7075) processed at 1200°K. The counterdiffusion model of Mg2+ and Al3+ fluxes was employed for the spinel formation reaction. From the parabolic relation between the thickness of the spinel layer and time the reaction rate constant was determined to be a function of the average diffusion coefficient of Al3+ ions. By applying the parabolic equation to the experimental data of the CA/Al 7075 the average diffusion coefficient of Al3+ ions in the MgAl2O4 spinel at 1200°K was calculated and this value appeared to be in small deviation from the extrapolation of previous diffusion coefficient data.

AB - A kinetic analysis was performed on the spinel (MgAl2O4) formation reaction at the interfacial region of the calcium aluminate (CaO-Al2O3) fibre-reinforced aluminum 7075 alloy matrix composites (CA/Al 7075) processed at 1200°K. The counterdiffusion model of Mg2+ and Al3+ fluxes was employed for the spinel formation reaction. From the parabolic relation between the thickness of the spinel layer and time the reaction rate constant was determined to be a function of the average diffusion coefficient of Al3+ ions. By applying the parabolic equation to the experimental data of the CA/Al 7075 the average diffusion coefficient of Al3+ ions in the MgAl2O4 spinel at 1200°K was calculated and this value appeared to be in small deviation from the extrapolation of previous diffusion coefficient data.

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