Interfacial reaction between the oxidized SiC particles and Al-Mg alloys |
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Authors: | Zhongliang Shi Mingyuan Gu Junyou Liu Guoquan Liu Jae-chul Lee Di Zhang Renjie Wu |
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Institution: | (1) State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, 200030 Shanghai, China;(2) School of Materials Science and Engineering, University of Science and Technology Beijing, 100083 Beijing, China;(3) Division of Materials Science and Engineering, Korea Institute of Sciecne and Technology, P. O. Box 131, Cheongryang, Seoul, Korea |
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Abstract: | The interfacial reactions of oxidized SiC particles reinforced Al-Mg matrix composites were investigated by the field emission-scanning
electron microscopy (FE-SEM), TEM and X-ray diffraction. It was found that the nanoscale MgO forms initially due to the interfacial
reaction, then whether it reacts with molten Al continuously or not depends on the content of Mg in the matrix and its covering
densification at the surface of particles. When there is not enough Mg in the matrix for the formation of dense MgO layer,
MgO will transform into MgAl2O4 crystal owing to the continuous reaction with SiO2 and molten Al. When dense MgO layer forms at the surface of the particles due to the affluence of Mg for the initial reaction,
it will protect the inner SiC from the attack of molten Al. However, the reaction products of both MgO and MgAl2O4 are thermo-stable phases at the surface of the particles under high temperature. The results clarify the interfacial reaction
route and they are of great value to the control of the interfacial reactions and their interfacial design of the composites. |
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Keywords: | oxidized SiC particle Al-Mg matrix composite interfacial reaction FE-SEM nanoscale MgO MgAl2O4 |
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