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Article

Microstructural Evolution and Strengthening Mechanism of SiC/Al Composites Fabricated by a Liquid-Pressing Process and Heat Treatment

1
Composites Research Division, Korea Institute of Materials Science (KIMS), Changwon 51508, Korea
2
Materials Science and Engineering, Pusan National University, Busan 46241, Korea
3
Department of Advanced Materials Engineering, Dong-Eui University, Busan 47340, Korea
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(20), 3374; https://doi.org/10.3390/ma12203374
Received: 23 September 2019 / Revised: 12 October 2019 / Accepted: 14 October 2019 / Published: 16 October 2019
(This article belongs to the Special Issue Advances in Materials Processing)
Aluminum alloy (Al7075) composites reinforced with a high volume fraction of silicon carbide (SiC) were produced by a liquid-pressing process. The characterization of their microstructure showed that SiC particles corresponding to a volume fraction greater than 60% were uniformly distributed in the composite, and Mg2Si precipitates were present at the interface between the matrix and the reinforcement. A superior compressive strength (1130 MPa) was obtained by an effective load transfer to the hard ceramic particles. After solution heat treatment and artificial aging, the Mg2Si precipitates decomposed from rod-shaped large particles to smaller spherical particles, which led to an increase of the compressive strength by more than 200 MPa. The strengthening mechanism is discussed on the basis of the observed microstructural evolution. View Full-Text
Keywords: Al matrix composite; high volume fraction; liquid-pressing process; microstructural evolution; strengthening mechanism Al matrix composite; high volume fraction; liquid-pressing process; microstructural evolution; strengthening mechanism
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MDPI and ACS Style

Shin, S.; Cho, S.; Lee, D.; Kim, Y.; Lee, S.-B.; Lee, S.-K.; Jo, I. Microstructural Evolution and Strengthening Mechanism of SiC/Al Composites Fabricated by a Liquid-Pressing Process and Heat Treatment. Materials 2019, 12, 3374. https://doi.org/10.3390/ma12203374

AMA Style

Shin S, Cho S, Lee D, Kim Y, Lee S-B, Lee S-K, Jo I. Microstructural Evolution and Strengthening Mechanism of SiC/Al Composites Fabricated by a Liquid-Pressing Process and Heat Treatment. Materials. 2019; 12(20):3374. https://doi.org/10.3390/ma12203374

Chicago/Turabian Style

Shin, Sangmin, Seungchan Cho, Donghyun Lee, Yangdo Kim, Sang-Bok Lee, Sang-Kwan Lee, and Ilguk Jo. 2019. "Microstructural Evolution and Strengthening Mechanism of SiC/Al Composites Fabricated by a Liquid-Pressing Process and Heat Treatment" Materials 12, no. 20: 3374. https://doi.org/10.3390/ma12203374

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