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Open AccessArticle

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

1
School of Materials Science and Engineering, Tongji University, Shanghai 200092, China
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School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
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College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
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Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(3), 420; https://doi.org/10.3390/met10030420
Received: 18 February 2020 / Revised: 16 March 2020 / Accepted: 22 March 2020 / Published: 24 March 2020
Aluminum composites reinforced with ceramic whiskers exhibited a unique combination of high specific strength and superior specific modulus. A 20 vol.% Si3N4w/Al-11.5Si-1.0Mg-0.5Cu-0.5Ni (wt.%) composite was fabricated via squeeze casting in the present study. It was observed that the addition of silicon nitride (Si3N4) whiskers in the Al-Si cast alloy promoted extensive twinning in the eutectic silicon particles due to a coupled role of thermal stresses between the matrix and silicon and residual stresses present in the composite. Double aging peaks were present in the age-hardening curves. The precipitation mechanism involved the formation of Mg2Si and Al2CuMg phases. The presence of Si3N4 whiskers in the composite retarded the nucleation process of Mg2Si precipitate while enhancing its growth rate. View Full-Text
Keywords: composite; silicon nitride; Al-Si alloy; twinning; precipitation composite; silicon nitride; Al-Si alloy; twinning; precipitation
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MDPI and ACS Style

Qu, S.; Feng, A.; Geng, L.; Shen, J.; Chen, D. Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior. Metals 2020, 10, 420.

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