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Journal of Materials Engineering and Performance

Published in:

13-09-2018

Microstructure and Mechanical Properties of Mg₂Si/AZ91 Composites In Situ Synthesized by Using Silica Fume as the Si Source

Authors: Wenlong Zhang, Xianfeng Li, Dongyan Ding, Ping Gao

Published in: Journal of Materials Engineering and Performance | Issue 10/2018

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Abstract

Microstructure and mechanical properties of in situ Mg₂Si/AZ91 composites fabricated using silica fume as the Si source were investigated. The composites contained α-Mg, network Mg₁₇Al₁₂, lamellar Mg₁₇Al₁₂, coarse polygonal Mg₂Si and needle-type Mg₂Si. Mischmetal modification eliminated the coarse polygonal Mg₂Si and resulted in a decreased amount of lamellar Mg₁₇Al₁₂ and refined matrix grain size. Solution and aging treatment made the network Mg₁₇Al₁₂ transform into lamellar Mg₁₇Al₁₂. As the volume fraction of Mg₂Si increased, the matrix grain size decreased, the amount of Mg₁₇Al₁₂ increased, and more Mg₁₇Al₁₂ precipitated in grain interiors as a result of the increased Al/Mg ratio caused by increasing the amount of Mg₂Si. The tensile strength and elastic modulus were much higher for the modified composites than for the unmodified one and increased by both increasing the volume fraction of Mg₂Si and performing aging treatment. The composites failed in a quasi-cleavage fracture mode, and coarse polygonal Mg₂Si phases were responsible for the lowest ductility of the unmodified composite. The highest UTS of 291.55 MPa obtained is much higher than those reported so far by using fly ash as the Si source, indicating that silica fume is more suitable as the Si source to synthesize Mg₂Si/AZ91 composites.

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Title: Microstructure and Mechanical Properties of Mg2Si/AZ91 Composites In Situ Synthesized by Using Silica Fume as the Si Source
Authors: Wenlong Zhang
Xianfeng Li
Dongyan Ding
Ping Gao
Publication date: 13-09-2018
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 10/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-018-3632-z

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